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Old 06-01-2019, 01:20 PM
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Join Date: Oct 2010
Location: Ex UK Brit now in Latvia west coast - Ventspils
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A good condition, fully charged, large car battery, will provide many charges
That's the main thing ... large and good condition.

But monitoring the state of charge of that battery is advised ... Lead Acid battery do not appreciate being left in partial charge state, second they should be at least in the top 1/3rd charged state ...

My cruising yacht has a double bank of 80 - 100A/hr car batterys. A 40A/Hr will do the job as long as engine is run often to charge it up ... but being a sail boat - its quiet and graceful under sail. The 40 would be cycling discharge / charge too much and life expectancy short. With Lead Acid - its always best to have MORE capacity than needed ... the battery will reward you with longer better service.
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