California
Super Star Member
- Joined
- Jan 22, 2004
- Messages
- 16,606
- Location
- An hour north of San Francisco
- Tractor
- Yanmar YM240 Yanmar YM186D
I used one of those for years, intermittently on a seldom-used tractor. I think it will stay ahead of the self-discharge of a battery, but I doubt it's sufficient to maintain a modern car (or tractor?) that has an active alarm system or other continual draw. And I know it won't bring voltage up if it is already below 12.6, fully charged, when you attach it.Solar powered battery maintainer from Harbor Freight.... clamps were barely soldered and one wire came off as I was attempting to pin it out with a multimeter. So, I broke both wires off, tinned them, crimped them and soldered them back to the clamps properly.... at $9.99 on coupon.... Can it be okay?
That high no-load voltage doesn't mean anything. Any load at all will pull the voltage back down to match the battery it is attached to.
After I didn't use the solar charger for months then found my neglected tractor had gotten down to 12.2 volts, I quit using the solar charger and went to a Batteryminder from Northern Tool. Those have an excellent reputation online. That charger is capable of bringing up a discharged battery (at 1.3 amps) and is claimed to shut off when not needed.