Join date: Nov 17, 2022


How to select a inverter battery?

When we choose batteries for inverters, we should consider two main factors.

1. The "C" grade of the battery.

When selecting a battery for an inverter, the "C" rating of the battery is an important feature. It is defined as the safest maximum discharge rate that the battery can handle.

It is usually expressed as C5, C10, or C20. 5,10, or 20 indicates the minimum discharge time (in hours) of a battery of this type.

Let's know the difference between C10 and C20 batteries. Consider two 100Ah batteries, each rated C10 and C20.

C10,100Ah battery can discharge 10A current safely for 10 hours. But a C20,100Ah battery can discharge for 20 hours at a rate of 5A. It can be considered that C10 battery has a faster discharge rate than C20 battery.

If the discharge rate exceeds the specified value, the battery life and efficiency will be reduced.

Always use C10 or C5 batteries instead of C20 batteries, especially for solar applications.

Two, storage battery capacity.

The battery is the backbone of the inverter system. The performance (and life) of the inverter depends largely on the quality of the battery. The next question is: "How much backup will the inverter provide? "Or" how many hours will it run all of your devices? This is called battery capacity. Battery capacity determines the backup time.

The battery voltage (12 V or 24 V) is determined by the inverter, so you don't have much choice, but you can choose the ampere-hour capacity (AH) according to the backup time you want. For example, a 12 V inverter and 100 Ah storage battery can provide 2 hours of backup for a certain load. It will provide four hours of backup for 180 Ah batteries. Bigger batteries cost more and take up more space, but are worth it in the long run. The backup time required depends on how long the power is normally off in your area.

To get a better idea of this, here's an example: Suppose that the total wattage of all the appliances you want to run is 535W, as shown below.

Battery capacity = Power requirement (Watts) * Backup time (hours)/Battery voltage (volts)

Battery capacity = (535 * 3) / 12 = 133 Ah

(Here, the battery voltage is 12V)

Therefore, a battery with a capacity of 133 Ah will fit your inverter.

Above, these two main factors need to be considered when choosing a storage battery for your home or office backup inverter power system.

tom lee

tom lee

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