Design techniques for cheap spare batteries for household solar power systems

2022/04/08

  Author :Iflowpower – Portable Power Station Supplier

A common problem with solar installations is whether the battery system can provide a whole house spare power supply, which is often to avoid installing special panels for the standby load. However, the installer should remember, for example, a standard 200 amps residential service can provide 48 kilowatts of continuous power, and most battery inverters have less than 10 kilowatts of consecutive power output. Although these inverters can be stacked to provide more power, most residential owners only buy one or two battery inverters.

Backup The entire building also reduces the overall storage time of the battery. Powering each device is very good during the power outage, but if the system is turned off due to the inverter overloaded or depleted the battery, it will not be wonderful. System designers are often working under incomplete modeling data, so finding the right balance point between customers' wishes and needs may make people measures.

But everyone can agree that the goal of the spare battery system is to make power more reliable, not more unreliable. In the end, the standby system should protect the food in the refrigerator and freezer, keep the garage door, the Internet is opened, and power is powered by the entrance / export, kitchen and main bedroom. Automatic backup any further load makes these loads in danger, but maintains automatic protection backup panels, so that the work of rewiring has lowered.

The lack of air conditioning and hot water heating circuits are significant in this list. When there is sufficient solar energy, these heavy loads can usually operate through solar cells - but the power failure may occur when the system owner leaves the family. You won't want unused hot water or air conditioners to become the cause of all foods in the system crash and refrigerate the refrigerator.

Although these problems can be solved by smart service panels, larger battery packs and more inverter power supplies, these are expensive solutions. The cheap design plan is a cheap solution to wiring the power grid side of the battery inverter as a "power supply side" - for the large solar project site, solar installation personnel should be very familiar with this solution. Then, the installer should install a small, pragmatic spare panel for automatic load.

Finally, the installer should consider running a "generator interlock switch" between the spare panel and the main service panel. This affordable device is usually used for locking grids when powered by a portable generator for home. In this case, the backbone of the battery inverter replaces the generator.

This allows the system owner to power the circuit of any circuit in the house by manually throwing the circuit breaker on the main service panel. This technique separates the most critical load from other loads of the building, so that the food in the refrigerator will not be thawed because of accidental operation of air conditioning. But when the sun rises during the day, the homeowner can manually open the heavy-duty electrical appliance such as hot tank, and any other load in the house, not to exhaust the battery.

This means that reliable full house reserve power supply can be provided through a single battery and battery inverter, and its budget is also most of the solar owners can bear.

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