What is an off-grid solar power system?
Off-grid solar power system is a system that uses solar energy (green and clean energy) to provide stable power to AC devices when there is no grid or grid is only used as a backup.
Building an off-grid solar power system is a difficult task that many people want to but don't know how to start. It is common for us to design and build a complete off-grid solar power system in areas where there is a shortage of electricity or for the concept of environmentally friendly, but how to build it reasonably? This article will use the simplest language to help you answer various doubts about building off-grid solar power system. Rico Chen, founder of CNBOU, engaged in the off-grid solar power business for ten years, we have collected a lot of information in the sales of about 15000 inverters each year, and finally presented a set of relatively reasonable off-grid solar power system solutions.
It depends on whether your system is running at a full load for a long time or using it occasionally, just like: induction cooker or kettle, etc. Because if we only use several minutes or less than half an hour, we don't need to match with solar panel with same power. Solar panel with 900W can generate electricity 4.5kWh in 5 hours, the electricity consumption of 2kW pure sine wave inverter in an hour is 2kWh, if just use occasionally, it will be enough. Of course, you may say I have many LED lights used in the off-grid solar power system of the farm, that you may need configurative 6*300W Mono/polycrystalline solar panel. Meanwhile, you need to replace the Mppt solar charge controller that is twice as large. Here we highly recommend Mppt solar charge controller. Although PWM is cheap, its efficiency is 20%-30% less than that of Mppt, which will lead a waste of your solar panel.
It depends on how long you require your system to run on batteries without any assistance? There are many types of 5KW off grid solar inverters on the market, what we see are usually two types:
1. Solar panel input is less than 5000W
2. Solar panel input is greater than 5000W.
When you need to install off-grid solar system on your boat dock, I think it is a professional work. Boat dock is usually built without grid, if we need to apply for a transformer to power a separate boat dock, it will be very expensive to achieve. Therefore, choosing an off-grid solar system for free, eliminating the need to build a transformer to provide grid (about $20,000) and not having to pay for the usual grid, is a good solution for your boat dock.
Off-grid solar system on boat dock from a solar energy system can power the following:
●Washing machine, microwave oven
●Charge to Mobile phone, laptops, tablets
●Party accessories like speakers, TVs
Many owners of boat docks wonder if off-grid solar system will cover all their use cases or not. The answer is yes. This off-grid solar system can work all year round.
If you live in a city, building a completely self-contained off-grid solar system may not seem particularly appropriate, either for economic reasons or for environmental reasons. Maybe you don't have enough roof space to build a solar panel for your entire home, and since the electricity supply in cities is stable and relatively inexpensive, building such an off-grid system may not seem to meet the goal of cost savings.
If you are in a rural area, or in a less developed area, it is possible to build a stand-alone off-grid system to meet the electricity needs of your house. We first need to calculate the electricity consumption of your whole house, if it is a new house then you need to calculate the power and average time of use of all the electrics, if it is an old house then you can check your electricity bill to see how much electricity you use each month. Considering that the electricity comsumption is relatively high in summer and winter (mainly air conditioning), we recommend you to ask a professional EPC to do the calculation while spring and fall are relatively less. To create a stand-alone off-grid solar system to meet the year-round electricity consumption of your entire house requires accurate calculations. In addition to calculating electricity consumption, we also need to consider the weather and climate of your location. The sunshine is different in each region, and the energy produced by the solar panel will be very different. Although we know that the electricity generation in summer is always greater than that in winter, we have to calculate according to the sunshine situation and install enough solar panels to supply the electricity demand of the entire house. Once we have the exact amount, we can measure if you have enough space on your roof. When considering the installation of solar panels, it is very important to install them in a south-facing direction, as the sun shines much more often in the south than in the north.
After we confirm the size of the solar panel to be used and the installation space, we select the appropriate MPPT solar controller and sine wave inverter. We suggest to use an MPPT solar controller that 20% larger to facilitate the use of later expansion. The inverter needs to be larger than the peak power, for example, you have air conditioner, refrigerator, these are inductive loads, instant start power is very large, choose the right power inverter will make the system more stable operation.
A house runs on solar power alone is completely achievable. After we understand the most basic calculation, it is still recommended to hire a professional installation company to build the independent off-grid solar system.
It depends on how big an off-grid solar system you are going to build, usually an off-grid solar system consists of the following parts:
· Off-grid solar inverter
· Solar Panel
· Solar panel bracket
· DC and AC circuit breakers
· Connectors and cables
Of course, this is only the cost of hardware, if you need to ask the installation company, it may also needs to spend some fees.
If you need to build a small off-grid solar system, you only need 1000W inverter, and our latest Hestia series 1000W off-grid solar system kit will be very suitable. It integrateds with a 40A MPPT solar charge controller, 1000W pure sine wave inverter and 12.8V 100Ah LiFePO4 Battery. The 40A MPPT solar charge controller can support a maximum of 600W solar panel input in the state of a 12VDC system, and our unique design will allow you to additionally expant 3 sets of the 12.8V 100Ah LiFePO4 battery. The total battery capacity will reach 5.12KWh.
Hestia series off-grid solar system is currently the most suitable system for DIY, the build-in 40A MPPT can support 12VDC/24VDC/48VDC battery system, and the maximum power of the inverter can be matched with a 2000W pure sine wave inverter. If you have enough hand-on ability, we can configure a 48VDC 2000W pure sine wave inverter, so that the entire system will become a 48VDC system, the build-in 40A MPPT solar charge controller will support the largest solar panel input to 2000W. And for the build-in 12.8V 100Ah LiFePO4 battery, we have reserved an interface, which can connect 3 BL-1280 battery in series externally to make the whole system achieve 48VDC. BL-1280 battery can support a maximum charging current of 1C, if you have a 2000W solar panel, it will fully charge the battery in 2.5 hours. 2000W pure sine wave inverter can meet most loads, this is completely a DIY design, and teh combination you like will give full play to its perfromance. Even if you need to upgrade in the future, you just need to repurchase the inverter module.
We will end here with 300W-5000W small off-grid solar power system, these come for a large number of actual customer cases we have collected and then recommend. If you want to know more about the information, please contact us. Also if you have batter suggestion, please let us know, and let's contribute to the development of off-grid solar power system.
Author: Rico Chen By CNBOU