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08-12-2019, 23:11 #4
- Join Date
- Oct 2012
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- Durban
- Age
- 49
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- 2,575
Re: Charging my alarm backup battery using solar
You are not taking into account that the battery with the greater charge also has a higher voltage which acts to "resist" the charger more than the battery with the lower charge.
That being said excluding the charger as soon as you connect the two batteries in parallel the one with the higher voltage (and hence charge) will force current into the other pretty much charging it until both battery's are at the same voltage. At this point they act as one battery with double capacity. Obviously though it will take double the energy to charge them too.
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