The task of a marine power inverter is to convert DC power into 120 Volts AC power as that allows you to use household items on the boat. The inverter takes the DC power from the battery bank of the boat. If you are having an inverter on the boat then you don’t need to install a generator. You will get inverters of different sizes in the market. Now let us find out the reasons for which you need to install a marine power inverter on the boat.
Advantages of having an Inverter on Boat
If you are traveling on a boat in the sea then inverters can actually make the journey enjoyable for you. You can use household appliances like TV, printer, computer, microwave, etc. throughout your journey and it is made possible by the 120 Volts AC power supplied by the inverters. It prevents you from sharing power with the help of a generator. It can also be used to recharge mobile phones or VHF batteries with AC chargers. Inverters give you the option to use AC electronic appliances without purchasing equipment that is powered by battery or 12 volts. The AC power tools are quite expensive and they are much more powerful than tools which are battery powered.Techniacally benefits of marine inverter on boat discuss on https://www.trollingbatteryguides.com/marine-power-inverter/ must check and increase your boat appliance life.
A generator is usually used to fulfill AC power needs of large electronic equipment like air conditioners and large refrigerators. If your AC power requirements are small and if you are not willing to use an internal combustion engine then you can choose to install marine power inverters in your boat. Such inverters are cheap, you don’t have to spend much on their maintenance. They are a stable source of AC power and their circuitry is solid and nonintrusive.
Even if the inverters form a sine wave that is altered and not similar to that of a generator, the power of these inverters is enough to run several motor-driven and electronic appliances. You can also get inverters in the market that can produce true sine waves. They might be expensive but they can help in running more number of appliances and the possibility of causing any serious damage to such appliances to get reduced. A few devices like printers cannot be run by a modified sine wave, so it is good to spend some more money and buy an inverter that is capable of producing a true sine wave.
Inverters and Generators are Complementary to Each Other
You can have both inverter and generator on the boat as they are complementary to each other. While a generator can help in charging batteries and running large air conditioners, an inverter can help you to use TV, coffee maker or a small microwave. Hence, it is feasible for you to utilize the benefits of both inverters and generators on the boat.
So, if you are planning to go out for a trip in a boat, you must consider installing a marine power inverter that can make you feel at home. It will help in breaking the boredom of your journey and also save a good amount of money.
Solar panel power generation system use photovoltaic effect principle, it is the power system that directly convert solar radiation into electrical energy generating system. Off-Grid Solar System convert solar energy into electricity to supply the load through battery energy storage, connected to the off-grid inverter
System installation and construction
The following measures should be taken by electric shock :
Insulated shoes with low voltage insulated gloves should be worn and insulated tools should be used
Eye-catching, clear and easy to understand electrical safety logo should be pay attention to in construction site
Outdoor construction work shall not be taken in rain, snow, windy weather conditions
when installed power systems at the construction site, overhead cable insulation should be isolated
Using hand-held power tool should follow the GB3787 standard “hand-held power tool of management, use and inspection Maintenance of safety technology “
The following safety measures should be taken when installing the 3kw Off-Grid Solar System:
The components of a photovoltaic system in the storage, handling, lifting and other process can not to be collision damage. When Solar PV lifting,its bottom be timbered, the back can not be subjected to any impact and weight
The surface of the Solar panel shall be covered by the valid shade during the installation, to prevent the risk of electrical shock.
The output cable of Solar panel can not be short-circuit.
When connected with no-switch-off arc function, it cannot be positive or negative or open under load or a low resistance circuit situation.
When connected completed or partially completed PV systems, in case of rupture of Solar Panel,we cannot close to the system and ask the professional worker for disposal.
Pay attention to the impact of the hot spot effect after connected Turn PV circuit and can not partial shelter solar panel.
Set up a dedicated footboard when installed and construced on more than 10 ° sloping roof
Aerial construction workers should wear safety protective equipment, and set up eye-catching, clear, understandable security identity.
Construction projects include: fabrication and installation of solar panel module bracket, installation of solar panel assembly phalanx, the battery connections, installation and commissioning of electrical equipment, debugger of off-grid system.
Construction sequence: basic construction – fabrication and installation of solar panel assembly bracket – solar panel assembly square installation -commissioning and installation of Controller – battery installation – installation and commissioning of electrical instrumentation equipment – debugger of off-grid system- System commissioning – final acceptance.
3kw Off-Grid Solar Systemparts list:
Solar Mounting Systems
Off grid inverter
Lightning protection equipment
Cable System Configuration:
Solar panel cables
Off-grid inverter cables
Load output cabels
Mains complementary line
The main measuring instruments and usage:
Measured horizontally standard deviation ± 2 “
Building Axes test vote
Measured the vertical standard deviation ± 6 “
Building verticality test vote
Measured go-back error of ± 3mm per kilometer high
building General height measurement
Length error ± 3mm
Accuracy error of ± 0.5
Measured voltage and current
Technical preparation is the key factor in determining the quality of construction, it follow following aspects of work:
first carry out investigation and research on the ground and access local data and related data analysis summary, make practical engineering design.
The axis of the control point building the establishment of the construction site of the project and elevation axes of control network.
Of high construction control ,it use water level elevation to introduced from the measurement standard point (bp), and establish fixed elevation control point outside the building was built in order to lead building measure and the foundation level.
Engineering axes control:axis test using theodolite Surveying and both ends of each control axis,establish some distance fixed mark leaving the location of the building to, for construction observation and review of the transfer use.
Prepare the construction of the required specifications, work instructions, for all kinds of records form Atlas construction and construction-related materials.
Organize construction team familiar with the drawings and specifications and do preliminary drawings record.
The technical staff make a joint checkup of the drawings and make a record of examination question.
Make practical and technical measures for the construction program and make construction schedule.
The installation include :1 Solar mounting system installation 2 Solar panel Installation 3 The connection of the system component.
1 Solar mounting system installation
1. Component construction content
Transportation of aluminum profiles and solar cell module
On-site positioning actinomycetes
Aluminum profiles and solar cell module
Solar panels array
String connection of Solar battery cables and DC convergence box connection
Electrical of testing string connections performance
According to drawings, determine the mounting area of solar panels, depending on the different components of the installation area, check if the embedded part meets the design requirements, determine the details of the location of each part of the holder of aluminum profiles, block division and do markers;
According to drawings,it is the time to divide region to refine division and precision measurement through a level, theodolite and other measuring tools. Put line according to each location, and retest to ensure the accuracy of construction, in order to reduce the amount of adjustment after the procedure.
Fix the base reference point and confirm the installation location
Mounting System installation steps:
front and back column installation:
Install front and back column on the Cement block foundation , and then install the Triangle connection on the front and back column. Attention: install the M10*25 Outer corner and Within briquetting on the triangle connection firstly.
Vertical beams installation
On the open side of the vertical beams , be connected tightly with the triangle connection Within briquetting.
Firstly ,installed the part of triangle connection well .Secondly, connect the bracing and triangle connection orderly. Thirdly,installed Fastener well .
Firstly ,installed the beam on the vertical beams through the bolt set.Secondly ,connected well the Beam through the fittings.Thirdly,tighten up the Fastenerver.
Firstly, install Edge Crush and Medium Crush well with the Bolt set.Secondly,list the solar panels well.Secondly, tighten up the Fastener.
Solar panel Installation
List embedded solar array rack plinth.And detect a single cell board current, voltage, qualified ,then install solar panel modules.Check if Plug is firmly .junction boxes and plug should be waterproofed. Detect if solar module array of No-load voltage is normal.this work should be completed by the professional technician.
3 The connection of the system component.
(1) solar panels (250w / 35v): every two solar panels in series into a group 500w / 70v. 6 parallel In parallel into 3000W / 70V. After the connection is completed, the solar panels will lead to a positive and a negative lead. Two copper connectors mounted on the positive and negative. Then connected positive and negative input terminals to 60A Breaker (1,3,5 input). Then connect a positive and a negative lead wire connected to the 60A Breaker output (2,4,6 output). Positive and negative cable leaded by output terminal connect to input terminals of the solar panel of the solar inverter. The positive line connected to the positive terminal, negative line connected to the negative terminal.
Solar panels positive and negative wiring work
Solar panel wiring groove
Solar panel wiring groove work
Component connection attention:
1 After the solar panels installation is completed, make the appropriate fine-tuning of the appearance of the assembly square flatness, pitch gap portion parts. After all meet the requirements, make the link at the welding operation with the welding and the whole structure stereotypes.
2 when installed solar panels, make ensure that the connection assembly bracket solid and reliable, and it can easily replaced by another solar cell module. Square solar cells must be able to resist and stand 120km / h wind without being damaged. Each Bolts, retainer clips and clamps must be fixed, can not be gaps.
3 Make sure the connection of the components accordance with the design and installation diagram groups are in strict connected in series, Grouping attended. Each group is connected to refine the division of labor, strengthen self-test and supervise each other, make sure the connection is correct. While ensuring reliable grounding. Wire joint firm, not out of line, the drain line. On-site production of special connectors must be installed strictly complyed with rational combination of the assembly process, dedicated connector plug must be connected in place.
Solar panel installed well and work well, to test the connection.
Packet detect each solar cell connection status and parameters, there is some things need to detect such as physical output voltage, output current, and insulation resistance, etc., in order to detect the string connection is working, appropriate records should be made.
Ensure the reliable connection of the solar cell module and a holder, ensure reliable grounding DC combiner box and reliable connection as well as a solar cell module with insulation
(2)Battery (200AH / 12V): 12V battery every four series into a group consisting to 200AH / 48V. After the completion of a series-parallel drawn, positive lead and a negative lead from both sides of the battery. Positive and negative connect to the input terminal (1,3,5) of Breaker 100A, leads to two wires from the output of the Breaker (2,4,6) connected to the solar inverter
(3) AC output cable (220V / 50HZ) connection. AC output terminal of solar inverters connect to three-Color lines ,which connected to the AC output terminals live, neutral and ground. On the other end ,it connected to 32A Breaker input terminal: FireWire to FireWire connection, the zero line to the zero line, ground to ground wire. The live, neutral and ground leading from the breaker is connected to the power supply socket (FireWire connected FireWire, zero line and ground zero ground). As illustrated
(4)3kw Off-grid Inverter
220v±3% or AC 220v±3%240v±3% or AC 100v±3%110v±3%
The maximum continuous output power: 3000W;The instantaneous maximum power: 6000W
Solar panel reverse polarity protection, short circuit protection, lightning protection, battery high / low protection, thermal protection, over-discharge protection
Controller’s Voltage must be the same with the off grid inverter, same with solar panels voltage output level after it connected. Then start to Calculate the current:the current is decided by the solar panel’s power,for example: four 200W solar panels,total 800w . the output voltage level after the connection is assumed to 24V, that current is 800/24 = 33A, which is greater than 33A, charge controller, we can choose 24V / 40A of the charge controller.
emphasized: the size of the controller is determined by the solar panels; that is power of charge controller (voltage * current) is bigger than or equal to the total power of all photovoltaic panel;
Off grid inverter Algorithm
Inverter size is determined by the load, that is it is decided by back of the equipment loaded, but the device is divided into inductive load And resistive load, inductive load refers to motors, fans, pumps, air conditioners and other open opportunities for moving equipment, these devices will be turned on 4-7 times inrush current (except frequency start, frequency conversion has no effect), when calculating those devices, at least as 4-fold Power to calculate; resistive load refers to open little or no impact on current, such as lights, computers, monitors, etc; these devices will be able to calculate the original power.
When choose the off grid inverter , inverter’s power is bigger than the amplified load power;such as with 1KW pumps and a 1KW computer, that there will be more than four times the impact of water pumps, the computer does not.it would have to have a maximum power of 4 + 1 = 5KW, so at least choose the 6kw inverter
Battery selection also depends on power and time duration of the back of the device; power is sum of the load, but do not count the impact, because the impact of the boot just a very short time, little effect with the battery; the equation :(the total load power/ DC voltage) * time = single battery capacity; the number of battery section = DC voltage / individual cell voltages; For example: loaded withA 1KW motor, a 1KW computer, two hours to the emergency power supply, that the total power is 2000W, if the DC voltage is 24V,Individual cell voltage is 12V; battery capacity = (2000/24) * 2 = 166, which is to use 180AH / 12V battery; the battery section Number = 24V / 12V = 2; so this case will use section 180AH / 12V battery 2;
Read the following material will help you broaden the understanding of the solar inverter. It also helps you better manage renewable energy systems and address the problems that may occur in the system. If you intend to design and install the system, then you’ll want to know as much as the knowledge of the inverter. Here are some important factors to consider when selecting the solar inverter.
When buy a off-grid inverter, you need to select a input voltage and battery voltage inverter to match your system. As mentioned earlier, wind power, solar power and micro hydro power system voltage is usually 12v, 24v or 48v. In smaller applications, such as small hut or summer cottage, 12v system is very common. Civil systems usually voltage 24v or 48v.most are 48v, because 48v is most efficient.
System voltage refers to renewable energy technologies (PV array, or micro-hydro turbine generating electricity voltage). In other words, photovoltaic arrays or wind turbines connect in accordance with 12v, 24v or 48v output voltage ,as same with the battery Group,so it also produces 12v, 24v or 48v output voltage. The solar inverter will increase the voltage to 120v or 240v AC .Since the off-grid energy systems all components are working in renewable at the same voltage, and power inverter and battery must match .24v voltage inverter do not work in the 48v system. If you plan to install 24v PV array, you’ll need a battery inverter 24v of 24v unit and battery pack. You can exchange with Inverter Go technical, ask us which one is the best suitable inverter for your system, it always doing good.
When selecting the inverter for grid-connected systems, you need to select a PV array match the Solar inverter.
Modified square wave and sine wave
The next factor you should consider is its output waveform when selecting an inverter. Off Grid inverter has two forms: Modified square wave (also often called modified sine-wave) and sine-wave.On Grid Inverter is a sine-wave inverter, so that it can match the power grid form.
Modified square wave power is a kind a rough approximation of grid power forms. But for most applications, such as refrigerators, dishwashers and power tools, it is a good form of energy. It also applies to most electrical equipment, including televisions, lights, stereo equipment, computers and ink-jet printer. Despite all of these devices can be operated in the form of poor quality energy, their efficiency will be reduced, and more serious fever (lights or water pumps, etc.), which is caused by a given input.
However, when the modified square wave supply sensitive electronic circuits, such as a microprocessor-controlled front door drum-type washing machine, the device having electronic watch, charger all kinds of wireless tools, copiers and laser printers. Problem appeared. These devices must work in the sine wave power. No sine wave power, That would be bad. For example, First inverter dan purchase is a modified square wave inverter, he found his front door frigidaire gallery energy-efficient drum-type washing machine does not work in this energy form. This washing machine control microcontrollers – Microcontrollers also control other similar models (except staber washing machine), can not work in this energy in the form of poor quality. Since dan replaced the sine wave inverter type , There have not encountered such problems.
Some laser printers performance is not good under modified square wave, as well as some of the chargers, ceiling fan and dimmer battery tools.
Worse, some electronic equipment, such as televisions and stereos, as long as it work in the modified square wave energy, it will send annoying high-frequency hum. Modified square wave energy may also cause nasty streaks appear on the TV screen, and damage sensitive electronic equipment.
Work under modified square wave energy, the microwave cooking will take longer time. In the modified square wave, instruments and equipment will appear more serious fever, life will be reduced. Computers and other digital devices work will happen more errors and catastrophic failure, the digital clock can not work as setted, the motor sometimes does not work at the rated speed. So why manufacturers produce modified square wave inverter?
The most important reason is the cost. Modified square wave inverter is much cheaper sine wave inverter, each will save you 30% to 50% of the cost.
Another reason of maintaining modified square wave inverter production is that they are very rugged. They require little care and can work for many years (related with their durable performance and simple structure: they are much simpler than the sine wave inverter on an electronic device).
Modified square wave inverter has two types: high-frequency switching and low frequency switching. In contrast, high-frequency switching is cheaper. For example, a typical high frequency switching inverter 2000w price is cheaper 20% to 50% than the low-frequency type. weight of High frequency type is lighter, and therefore it is easier to install. High-frequency inverter weight 13lb, and low-frequency type weight 501b.
Low-frequency switching-type modified square wave inverter compared with high frequency switching inverter,it costs higher, but also heavier, but these investments are worthwhile. One reason is that they usually have a higher anti-surge capacity. This means that they can transmit more energy surge, which is necessary for starting certain electrical equipment for the well pumps, power tools, dishwasher, washing machine and refrigerator. The Shorter start-up time take, the greater the surge needed.
Although there are some solid improvements square wave inverter on the market, we recommend that you buy a sine wave inverter for the off-grid system. There are many modern electronic devices in the home, and the sine wave inverter output is an ideal fit for the use of these devices. InverterGo company’s sine wave inverters are very good, and it is reasonably priced.
Output power, surge capacity, and efficiency
When selecting inverters, even if it is a grid-connected inverters, you also need to consider three additional factors:
Continuous output, surge capacity and efficiency.
Continuous output is a measure of the inverter output power under continuous operating conditions (if the system has enough energy available any). Inverter output power unit is w (watts), but some inverter is described by the current continuous output. The power conversion to electric current, you can refer formula: Power = current × voltage. For example, InverterGo sine wave inverter, model IG3000-1, continuous power 3000w. This inverter can easily while a microwave 1000w, 1200w of a hair dryer, and a few small load power (incidentally, “30” meaning the model number of the continuous output power of this unit It is 3000w). Continuous output inverter listed on this specification is 15a.
To calculate how much continuous power you need, you can put common electrical and continuous power together. Whenever possible and reasonable, usually only two or three large loads will work simultaneously. However, keep in mind that, in some cases, a lot of the load can work at the same time. For example, when run the dryer and the well pump, the dishwasher and the sump pump can run too. If you intend to open an stores close to home, and use the same power inverter, you may need a higher continuous output power of the inverter.
Electrical equipment with motors, such as vacuum cleaners, refrigerators, dishwashers and power tools, are required to start the pulse energy. You can easily observe this: when someone opens a device, such as a vacuum cleaner when you can take a look at renewable energy systems installed in the meter, or look at the current watt meter on. If you look carefully, you will find there is a transient current spikes, which is needed to power the motor starter surge. Spikes usually only lasts less time ls, but even so, as long as the inverter does not provide enough energy to power tools or appliances can not start. That Can not start the problem is not just inconvenient, the motor will stall generate a lot of current, soon serious fever. Unless it is equipped with a thermal protection device, otherwise the motor will burn.
At the time of purchase of the inverter, make sure to check the inverter surge capability. All the quality standards of the low-frequency inverter design can ensure it can withstand short-term power surges, typically 5s or so. surge capacity or power surge of The instructions, will be listed in the form of power or current.
when buying inverters Another consideration is the efficiency of the inverter. Calculated the energy efficiency :the input energy/output of the inverter.
Inverter efficiency is from 80% to 95% range, maximum efficiency of the most models are up to 90%. For example, a 92% efficiency of the inverter, the DC into AC 120v, it will lose 8 percent of the energy.
It should be noted that the efficiency of the inverter can change with the load. richard perez is a renewable energy expert, is also a “home power” magazine publisher, according to his introduction, in general, as long as the output reached 20% to 30%,the rated power of the inverter can reach the highest efficiency. For example, an inverter 4000w, when output exceeds 800 ~ 1200w, will reach maximum efficiency. Power is lower than this, it will significantly reduce the efficiency.
Inverter heat dissipation
Since the efficiency of the marine power inverter is not 100%, the solar inverter internally generate excess heat. An 90% efficiency ,at rated conditions of operation 4000w inverter will generate heat internally 400w (equivalent to the heat emitted by four 100w bulb). The inverter must isolated from the heat, otherwise it will be damaged.
Inverter heat sink and fan rely on isolation to reduce internal temperature.it Increase the area of heat sink cooling fan ,which blowing through the internal module to dissipate heat. However, if the inverter is in a high temperature environment, That promptly dissipate heat to keep the inverter in a safe temperature conditions is very difficult.
The inverter often equipped with a thermal protection circuit. That is, the program will control the solar inverter when the internal temperature exceeds a set value automatically it will reduce the output (less electricity). With the power oscillator (h bridge) internal temperature Increases, the output current is reduced. In other words, this means that if you need a lot of power, but the solar inverter internal temperature is very high, your needs will not be met. For example, a solar inverters, in 77of (25 ℃) at up to 100% continuous output, but in 117.5of (47.5 ℃) output has dropped 60%.
This data has many meanings. First, the solar inverter must be installed in a relatively cool location. dan inverter installed in his room Utility, and it was his muddy house coolest places on earth. Second, Do not mount the solar inverter into a box to isolate noise (though not all inverters are noisy). Third, be sure to buy a good heat dissipation of the solar inverter. Ideally, you need a natural cooling of the solar inverter can, that is a inverter can cool itself not consuming power. Many off-grid inverter has a cooling fan, for example, in a balanced charging.
The IG Series inverter has a die-cast aluminum housing equipped with fins, can naturally dissipate internal heat. On some models, the internal circuitry is fully encapsulated so that it can be isolated from the outside to prevent dust, moisture, insects, and may damage the inverter little mouse intrusion. However, That models equipped with vent holes allow outside air to flow through the interior of the electronic device may improve the performance of the inverter. Such models produce more than the enclosed AC power, Solar inverter have a better performance in high-temperature environment.
Most standard household battery inverters are equipped with a battery charger. So, if you plan to install off-grid system, or with a battery back-up with network-based system, be sure to select an inverter with a battery charger. With it you can use from the grid (with battery backup for the grid-system) or a generator(For off-grid systems or with a battery backup and grid-system) AC to DC battery pack.
No matter which inverter you choose, keep in mind that the inverter battery charger must be charged within a reasonable period of time. In addition, the capacity of the generator must be sufficient charging current and the current workload needs all the room needed to provide chargers.
The solar inverter can be installed and to be installed outdoors indoors. Most inverters installed in a weatherproof shell, just as mentioned before, all solar inverters need to avoid too low or too high a temperature. Many on-grid inverter rated ambient temperature -10of. Off grid inverters or hybrid inverters are usually installed indoors, so you can leave the battery recently, reducing line losses (as described above, the battery needs to “live” in a warm space). Most grid-connected inverter is installed in a room off the main circuit breaker panel near the place. Power transmission line is the introduction of housing from the main circuit breaker panel at the (most solar inverter manufacturers recommend their installation at room temperature).
How many years an off-grid system can live?As the solar power system is composed of many different components, and life of each component is not the same, so this problem should be separated, the solar panels have a long life, can reach 20–25 years, the controller and inverters generally can reach 5–8 years, and the battery are generally 3–5 years. battery and off grid inverter is the most important and vulnerable part of the off-grid solar photovoltaic system, their life will determine the life of the solar photovoltaic power generation system. When using off-grid power supply system, user should pay particular attention to maintaining the battery and inverter components, these two parts are effected by user habits. Therefore, special attention should be payed.
1 Battery Maintenance
Battery is in repeated charging and discharging process when use it. battery life is cycle times that be capable of withstanding the charging and discharging return. Firstly,it affected by the depth of discharge, the deeper the discharge, the fewer the number of cycles to return. secondly, if not timely charge and discharge, the number of cycles reduced. Therefore, when use it , try not too much depth of discharge, if due to poor weather conditions resulted in insufficient charging, you should use less or stop using it. Especially in the rainy weather of a long time, we must ensure that there is a certain amount of power the battery.
2 Off Grid Inverter Maintenance
The off grid inverter has a rated output capacity , different capacity power generation system, different output capacity inverter .when it supply the power to household appliances, make sure electrical power is lower than the inverter rated output capacity. In general, that ensure that electrical power is less than 80% of the inverter power level is appropriate. For example, a 3000W off-grid power system configured inverter is 3000W output capacity, you can only use electrical power to 3000W or less, to ensure that electrical power at 2400W or less most reasonable. If the motor and other inductive loads, it should be in 600W or less appropriate.