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Adding a Second House Battery


I have a total of four batteries, 3 starting and 1 house. It seems I'm asking to much of my new AGM house battery so I might add one more house battery. Is it as simple as securing a second battery properly, wiring + to + and - to- from the current house battery? I have an 80amp charger for the current house battery so is that enough and will it charge both with the simple wiring I laid out above? I have an additional 30amp charger for the starting batteries that I'm sure is isolated to those only.

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