Join Date: Mar 2008
Location: Anacortes PNW
Thanked 125 Times in 113 Posts
Rep Power: 9
I'd never heard the minimum 10% rule either for chargers. My impression is that wet cell batteries can only accept max charge (40A from your Truecharge) for a few hours before needing to taper off in voltage and amperage. This has also been my experience with my 420AH bank on my last boat which was kept in great shape for years with my truecharge 20A. Even when deeply discharged the charger only operated at 20A for a few hours than went to 10, 5, 2, 1 etc.
If the 10% rule is true than isn't every cruiser charging with solar panels doing their batteries a disservice?
The truecharge battery chargers are one of those rare items of kit that I would recommend without reservation. Mine kept my abused, used, golf carts alive and well for almost 5 years of living-aboard and cruising for months at at time.
I have a sauna on my boat, therefore I win.
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