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inverter/ups selection.

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yafch

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hi guys.
i need to buy a good power inverter/ups for use during loadshedding. i went to market to check and compare. The types which i want to buy are of 220v output@ 1000W/1200VA. The other one is 1200W/2000VA .
I want to buy 1200W/2000VA.But there are futher two types of these. one type requires 12v input and the other one needs a 24v input.
The confusion i am having is input voltage. If i buy one with 12v input but use two 12v batteries connected in parallel(for longer backup time) will it be good to do so ? i mean i dont know whether both batteries would get equally recharged and give good performance.
On the other hand should i still buy one with 24v input.("MERCURY" brand is my first choice).
Thanks a million.
 
1200W at 24V is "only" 50A but at 12V it's 100A. Considering losses, I would probably end up using 4 times the wire size for 12V.

The advantage of 12V is, if one battery fails you can run at reduced capability with the remaining battery.
 
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