---

I have a computerized automatic Rule 1100 and I think its rated at 3.3 amps. No float switch to jam and its compact.

I also like the idea of the solar to try and keep the bilge battery topped off. If you go that route, I suggest the largest capacity panel you can accommodate. If we go with a pump that draws say 2-3 amps, we're talking about 24-36 watts of power consumption. Those little inexpensive 5 watt and even 15 watt solar battery chargers will be all but about useless in your situation IMO. They work okay for maintaining a charge on an unused battery but I don't think they'll restore one that has had a load.

Solar panels are typically rated at their absolute highest output voltage under ideal conditions so their ratings with real-world use can be very misleading. It may not be practical to completely recover all the power consumption from the bilge pump running constantly without a ridiculously large panel but anything would help maybe hold the battery over until the conditions improved and the pump cycled less. Then a smaller panel could bring the battery back up without as much a load on it.