Zozza 293 Posted February 6, 2022 Share Posted February 6, 2022 I've a delay in being able to get my marine electrical system installed. The batteries - standard Deep Cycle 100ah AGMs - have been in the boat close to a month. Boat is in a marina, so I cannot leave my boat unattended 24/7 with a trickle charger. How long before they are kaput via self discharge? Quote Link to post Share on other sites
Psyche 632 Posted February 6, 2022 Share Posted February 6, 2022 2% a month depending on weather? So ages if fully charged and no leaks. 1 Quote Link to post Share on other sites
Zozza 293 Posted February 6, 2022 Author Share Posted February 6, 2022 Yep fully charged , no leaks. That is encouraging thanks, Psyche Quote Link to post Share on other sites
Kevin McCready 83 Posted February 6, 2022 Share Posted February 6, 2022 I'm presuming also you will disconnect them. Quote Link to post Share on other sites
Zozza 293 Posted February 6, 2022 Author Share Posted February 6, 2022 correct Kevin Quote Link to post Share on other sites
CarpeDiem 430 Posted February 6, 2022 Share Posted February 6, 2022 You could pick up a relatively cheap ($50) solar maintenance charger from somewhere like supercheap auto. (Leave it connected for a day and then disconnect it for a week.. They are cheap for a reason) Then sell it when you're done with it... 1 Quote Link to post Share on other sites
wheels 543 Posted February 7, 2022 Share Posted February 7, 2022 As long as they were initially fully charged, you can actually leave them for some time. As in several months. The rule of thumb is either, charge every 90days or when the Voltage drops to 12.5V. Or as said above, buy a cheap 12V solar panel and connect. A small one of a watt or two could be left permanently connected. It won't over charge them when he Sun is at full shinyness and you don't need a regulator unless the panel is over 10W. 1 Quote Link to post Share on other sites
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