RE the length of time for the genset to recharge your batteries: as with most things - it all depends. In this instance, on the state of discharge, the condition of said batteries, type and capacity of the battery charger (converter) and genset output. It generally takes quite a while (several times the 15 minutes you mentioned) to (nearly) fully charge batteries that have been depleted by a third of their capacity. BTW discharging batteries below a certain level will severely shorten their lifespan, especially if they are not of the "deep cycle" type -- wet-cell technology batteries also have to be equalized from time to time so they don't fight each other. The OEM battery state indicator is not a good indication of battery status while being charged via the genset due to the way it is interconnected. A more accurate indication of battery status can be obtained after the initial charging cycle has been completed.
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Joe Corry
COL, USA, Retired
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