You can always go in series with the LiFePO4 and skip the 12v>24v to avoid drawing 2x as many amps and some losses to heat to make the voltage jump. One thing about these vs. lead acid, is they cannot handle very high current for long, though you're probably not drawing a lot with the pumps. The circuit will shut it off after a certain point and depending on the battery may or may not auto reset or need to be completely disconnected before reset. This makes them a lot safer and will instantly switch off if shorted out (Tested with a screw driver ) great for wet locations. I use 2 in series for a powerwheels 4 wheeler. They're great batteries, handle lots of abuse, lasts about an hour or more at full speed 2 kids on it.