Off Grid Solar Power - DIY Cheap Battery Bank
Okay, they're not REALLY solar batteries, but these four car batteries cost me a grand total of $15 and are definitely fit for purpose. I use these to run a few LED lights and a 12V pressure pump to pump water from the rainwater tank to the house. The pump and the lights draw probably 10AH per week.
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Music: Born Barnstormers by Brian Boyko. The full track is available at freepd.com. This music is in the public domain and is free to use.