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When you have an engine that you cannot start by hand, it is vital that you separate your battery (banks). We have, for years now, had a house bank with good deep-cycle batteries, and a starting battery or bank with good cranking power. We NEVER draw from the engine batteries for house loads. Be sure you can fully isolate the engine battery from other uses. This way if your house batteries fade away, you can be sure of being able to start your engine and recharge.
The new battery monitoring systems that track your usage and indicate remaining time can be very helpful in analyzing your usage and to let you know when it's time to recharge before it's too late. Just be sure to set them up to accurately reflect your amphour capacity.
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