Don't get me wrong, I've read many comments on this website of people who have used 12v for years without issue. That just didn't happen for me. I was going thru 3 to 4 a year despite the fact that I rinsed them after every use with at least 20 gallons of water.
I switched to a gas powered diaphragm pump. It's a triple diaphragm made by Comet, powered by a Honda Gx200, puts out 9.5 gpm at 150 psi. I can hit around 40 foot high with no wind. Th only thing I would do different is I would have gotten an air powered unit, only because the gas powered ones have a bypass line like a Pressure washer, the air power d ones just have in and out, no bypass. These machines run anywhere from $1500 to $2000, but their reliability is unmatched. And the internals are about as chemical resistant as you can get. Definitely worth the money.
Oh! And no batteries to charge!