I used to use small solar panels driving controllers driving small batteries (AGM or Gel) driving 12v bilge pumps for my fountains and swimming pool solar hot water heating.
Since your bilge pump is active 24/7 pulsing intermittently you need to do the math to properly size the system so the battery will do the job throughout the night.
For example, Harbor Freight has a three-panel 45W set that sometimes goes on sale for $150. All you might need is just one of those panels - do the math for your duty cycle.
http://www.harborfreight.com/45-watt-solar-panel-kit-90599.html
Look around, as you might be able to do better.
My 12v bilge pumps would only last three months of continuous 8-12hr daily use. Now I use small solar panels driving controllers driving small batteries driving small 120vac inverters driving tiny commercial ac fountain pumps - haven't had an ac pump fail yet, but had a $9 inverter go out after a year.
Food for thought if you want to play...
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