What is a Reasonable Battery Voltage?

Question:

Our batteries lose their voltage quickly when we are at rest. We should have a 600 AHrs bank, after draining 100 AHrs the voltage drops to less than 12v. Should I be worried about their health?

Answer:

From your description your batteries need to be replaced. At 50% discharge (ie. 300 AHrs) your batteries should have 12.2 Volts.

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