GUIDE TO DESIGN THE BATTERY

 Guide to design the battery for the solar power system:

The battery type recommended for using in solar PV system is the deep cycle battery. Deep cycle battery is specifically designed for to be discharged to low energy level and rapid recharged or cycle charged and discharged day after day for years. The battery should be large enough to store sufficient energy to operate the appliances at night and the cloudy days. To find out the size of battery, calculate as follows:

1. Calculate total Watt-hours per day used by appliances.

2. Divide the total Watt-hours per day used by 0.85 for battery loss.

3. Divide the answer obtained in (2) by 0.6 for the depth of discharge.

4 Divide the answer obtained in (3) by the nominal battery voltage, we have the capacity of the battery:

The above is the capacity needed for one day. But maybe there are many days there is no power produced by PV such as rainy and cloudy day, we must have some autonomy days, the days the system can operate without sunlight, just used energy in the battery.

5. Multiply the answer obtained in (4) with the number of autonomy days to get the total required capacity (Ah) of the battery.

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