Join Date: May 2007
Location: Santa Cruz
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Rep Power: 9
My battery switches have been on ALL since I bought the boat 14 years ago, but for reasons which probably don't apply in this case. I have 3 gel cell banks, and combining them cuts down on the discharge percentages and extends their life. However, I have alternative charging sources (solar, wind and water), and can recover from a shorted cell.
In this case, installing a ZAPSTOP would be the cheapest and easiest way to keep from frying the diodes when the in-laws are 'helping'.