That’s what led [TomGoff] to build his own solar ... to a 12 V water pump and the whole thing is controlled by an Arduino running 30 seconds on and 3 minutes off to conserve battery power.

We've evaluated dozens of solar batteries over the years, and in 2025, the Bluetti EP900 Home Battery Backup is CNET's pick for the best solar battery, overtaking the Tesla Powerwall. The EP900 ...