How to choose batteries for an inverter? There are two main elements we should consider when we choose batteries for an inverter.
Firstly,‘C’ Rating of Battery.
The ‘C’ rating of the battery is an important feature when selecting batteries for inverter. It is defined as the safest maximum discharge rate that the battery can handle.It is usually expressed as C5, C10, or C20. Here 5,10 or 20 indicates the minimum discharge time in hours for that type of battery.Let us understand the difference between C10 and C20 batteries. Consider two 100Ah batteries each with a rating of C10 and C20. The C10,100Ah battery can safely discharge at a rate of 10A for 10 hours. But the C20,100Ah battery can be discharged at a rate of 5A for 20 hours. Here we can consider that the C10 battery has a fast discharge rate compared to the C20 battery. If the discharge rate is more than specified, the life and efficiency of the battery will be reduced.
Always use a C10 or C5 battery over a C20 battery, especially for solar applications.
Second, in face of how to choose batteries for an inverter, we consider the battery in addition to the "C" grade, but also consider the capacity of the battery.
A battery is the backbone of an inverter system. The performance (and life) of an inverter largely depends upon the battery quality. The next big question is: “how much back up will an inverter provide?” or for “how many hours can it run all your equipment?” This is what is called the battery capacity. It is the battery capacity that decides the back-up hours.
Battery voltage (12 V or 24 V) is decided by the inverter so you do not have much choice but you can choose Ampere Hour capacity (AH) depending upon how much backup time you want. For example, one 12 V inverter with 100 Ah battery may give 2-hours’ backup for a certain load. It will give 4-hours’ backup for 180 Ah battery. A bigger battery costs more, takes up more space but pays off in the long run. The backup time required depends on how long power is usually shut off in your locality.
To understand better about this, here is an example: Suppose, the sum total of the wattage of all the appliances you want to run is 535W, say.
Battery capacity = Power requirement (in watts) * Back up hours (in hrs) / Battery Voltage (in volts)
Battery Capacity = (535 * 3) / 12 = 133 Ah
(Here, the battery voltage is taken as 12V)
Therefore, a battery with a capacity of 133 Ah will work for you.
These are two main things to consider when selecting batteries to an electrical backup system for your home or office.
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