How to Wire Multiple Batteries to Increase Current Capacity But Retain 12-Volt Operation

Question:

Sir I have 600 watt solar panels and one 850va ups. My ups is Luminous 850va and it support only one 12 battery. For more backup I want add two batteries. If I will add two batteries in parallel then will it work. Because my UPS custmer care executive said that it support only one battery. Please suggest what to do. I dont want make 24 volt system. Please give solution is possible.

asked by: Ajit K

Expert Reply:

If you wire two 12-volt batteries in parallel you will remain with a 12V setup, but one that has higher current capacity. If you were to wire the two batteries in series, you would then have a 24V setup, with the output voltage doubled but the capacity remaining the same. Please refer to the linked diagram for illustration.

If you prefer to use a single 12V battery you can select one with a higher current capacity than the current one which will let it last longer. According to the information I was able to find online this UPS works with battery amperage ratings from 120-AmpHours up to 220-AmpHours. I suggest checking the documentation that came with the UPS.

You should definitely follow the guidance from the manufacturer of your uninterruptable power supply (UPS) since they bet know its capabilities.

expert reply by: Adam R