The Harris battery and many similar batteries are not true deep cycle batteries. Some are marine/RV hybrids Some are just junk. If it is a true deep cycle it will have a 20 aH rating. I'm f not there don't. The Harris battery are around 60aH. This means after 30 aH of use they are by by. Add a second similar battery not much better off. A set of 2 T1 Trojan 6 v deep cycle will give you 220 aH or about 110 usable amps. Big difference.
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