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Possible single points of failure are shore power/charger, fuse, the
pump, the float, wiring, switch, and battery. The fuse is about the
only thing I haven't had problems with but other people often do.

Pumps that have to run often quickly burn out. Floats get stuck
open on gunk or wedged on a wire or come adrift and fall over and
burn out pumps and run down batteries. Wiring starting to develop
resistance takes out fuses.

I had two floats, each with their own wiring and pump, one on
shore power directly, but I'm getting around to adding a second
battery for it. There's a small amount of solar just to tend the
first battery since I keep having issues with shore power (given
how much Murphy hates me, I should not be sailing). Plan to add
a bit larger 50 or 100 watt one for the second battery.

All of this is 4200'd down to the bilge floor and (I'm sorry,
I'm repeating myself) after fiberglassing over about 20 screw
holes in the bilge floor I'm still finding them.

I'm trying to do redundant everything because everything is
suspect. Heck, I'd do redundant shore power if I could. So far,
a shore power cable went bad, the boat's plug is now even more
flakey after a late winter storm, and California starts turning
off the grid in dry summer storms when we aren't doing rolling
blackouts. Clearly I need a shore stand-by power diesel
generator with its own cord and charger to backup shore power.

All of that is still woefully inadequate given a leak worse than a
rapid drip. A lot of people, especially the mobo set, seem to think,
oh, my tiny little bilge pump that kicks on every hour is doing a fine
job of keeping up with the water coming in, it's fine, then are
shocked when the pump burns out after two months of that. This
hull #93 came with a leak and a pump that soon gave up.

-scott