Reddit reviews Rule 25 DA-24 Marine Bilge Pump, Non-Automatic, 500 GPH, 24 Volt
We found 1 Reddit comments about Rule 25 DA-24 Marine Bilge Pump, Non-Automatic, 500 GPH, 24 Volt. Here are the top ones, ranked by their Reddit score.
High Flow - optimized impeller to provide greater flow at the same amperageBuilt-In Thermal Cut-Off (TCO) – provides added protection for pump and vesselBack Flow Prevention - reduces the amount of water left over in the bilge, reducing odor and helping keep your bilge cleanerHidden Air Vents in the Body – helps prevent air locking in challenging plumbing installations and helps with the check valveThreaded Discharge - easier installation, easier maintenance
You can get a 24volt bilge pump. https://www.amazon.com/Rule-Marine-Bilge-Pump-Non-Automatic/dp/B01N3CCK8R/ref=sr_1_3/141-9178635-4986428?ie=UTF8&qid=1525187582&sr=8-3&keywords=24v+bilge+pump
I'd imagine it'd run on 21volt, or even a submersible 12volt pump should be ok on 21volt.
I'd try the panel straight to the pump first, maybe adding a capacitor if you need to get over that start up hump. Seems like money spent on a controller and battery would be better spent on a bigger panel to get the wattage you need to overpower the pump. The difference between a 20 watt panel and a 40watt panel seems to be about $20, less than the cost of the better controller.
Like, this panel wants to run at 18v, which is only 4v higher than the 14v the 12v bilge pump might expect to see in a boat with an alternator
https://www.amazon.com/Powereco-Polycrystalline-Charger-Battery-Charging/dp/B0711TH5LK/ref=sr_1_6?ie=UTF8&qid=1525188017&sr=8-6&keywords=40+watt+solar+panel
If you're looking at a small 12v pump that's like $30, that's not too much risk in releasing the magic smoke. The battery is going to add another wear item to the sytstem.
After I smoked the first pump, I might add a buck converter https://www.amazon.com/Top-Spring-Converter-1-25-32V-Voltage-Regulator/dp/B079KDH8FS/ref=sr_1_6?s=sporting-goods&ie=UTF8&qid=1525188405&sr=1-6&keywords=buck+converter to drop the voltage down, but I wouldn't expect to smoke a pump.