i didn’t downvote but 17v on a 12v battery maybe seems a bit high. I’m more used to about 7-14% over (maybe up to 14v on a 12v batt) when charged/floating but i don’t use solar anywhere currently, and i usually work on 48v systems. i normally expect to see about 54v on a fully charged battery string (13.5v per battery x4) with the rectifiers running.
i also second the opinion of running an automotive PSU for this situation.
helenslunch@feddit.nl 6 days ago
Yes that’s incorrect. Open circuit voltage for solar panels can be in the hundreds of volts, but you’re never gonna put that into your battery. You’re gonna run it through a charge controller that will bring it down to a normal voltage. For a lead acid that will be somewhere around 13.6V and 14.4V for LFP.