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But aren't trickle-chargers overall a bad idea? (And it depends perhaps what kind of battery - I'm assuming conventional liquid lead-acid.) Even yer basic 3- or 4-stage charger, as per old posts in this forum, are better not left on indefinitely. On my boat, I winter-store the batteries on the boat (they self-discharge more slowly in the cold), after cleaning the tops (try to minimize tiny leakage-current through the grime), and make sure they're well-charged prior. I of course disconnect them. I am not qualified to promote this as "correct". I just lost an ordinary house-battery after 7 years. I have a car which sits most of the summer, and I put it on a trickle charger for a day once a month, or better yet (according to a mechanic), take it out for a good, warm-up spin. Another auto-mechanic I know of puts his own summer-car battery on a "tender" over the winter rather than a charger, but I have been unable to find what that means. I have no interest in this site, but the information is voluminous: batteryfaq.org. Charles ____ Charles T. Low 613-498-7687 > Date: Wed, 9 Dec 2020 03:54:24 +0000 (UTC) > From: liketoplaa@aol.com > To: trawlers@lists.trawlering.com > Subject: T&T: Solar trickle chargers > Message-ID: <1537092362.6026142.1607486064895@mail.yahoo.com> > Content-Type: text/plain; charset=UTF-8 > > > Rudy - yes, they work inside the windshield.? Obviously must be connected to a 'constant on' connection to the battery (some cigarette lighter outlets are only powered with the ignition on, which draws more than the charger puts out). > Better is to disconnect the battery from the car and wire directly.? If it's a modern car with computer-driven controls, there might be a 're-education' process once re-energized.? Or, do not disconnect if the risk of problems is too great. > Good luck.? Jim