elkhartjim Report post Posted September 23, 2019 I have a BatteryMINDer Charger, Maintainer, Desulfator that I use to keep my car, tractor, truck batteries maintained. I've never used it on my coach house batteries but I'm exploring that option. I know I can do this through the Magnum but I want to explore this possibility. It appears my 8 wet cell 6v batteries are wired in two separate banks of 4 each and are wired series-parallel. I'm not sure if or where they are combined later. Here is my question, Should I hook the charger/maintainer up to the individual bank of 4? I hope this makes sense. Share this post Link to post Share on other sites
richard5933 Report post Posted September 23, 2019 Can you post a photo showing how they are connected? Share this post Link to post Share on other sites
elkhartjim Report post Posted September 23, 2019 I tried to take photos but with the battery tops and cables black, its hard to see where the cables go. I may try to sketch something and post that. Share this post Link to post Share on other sites
wolfe10 Report post Posted September 23, 2019 As long as the bank(s) are wired "out the the coach" as 12 VDC, you can connect to the terminals that go to the house wiring. Explore with Battery Minder whether their device is adequate for what amp-hr battery bank. That will tell you if you can charge all together or one bank at a time. The math: Eight 6 VDC batteries-- likely around 220 amp-hrs each @ 6VDC. Each of your two separate banks would be 440 amp-hrs @12 VDC. So, ask Battery Minder if the unit you have is adequate for a 440 amp or 880 amp battery (charging both banks at the same time). Share this post Link to post Share on other sites
elkhartjim Report post Posted September 23, 2019 Thanks, Brett. I sent them an email early this morning and never heard back. I will call tomorrow. Share this post Link to post Share on other sites
manholt Report post Posted September 24, 2019 Jim S. I have the same as you. I'm on 50 amp shore at house, the only batteries I trickle charge are my 2 Series 31 start batteries! All mine are AGM's. Share this post Link to post Share on other sites
elkhartjim Report post Posted September 24, 2019 I'm interested in desulfating the batteries. I did this with my previous coach coach house batteries and they were 8 years old and still holding a good charge when I sold it. I'm not going to mention using mineral oil in each cell and I'm not going to mention I had no corrosion issues either. Share this post Link to post Share on other sites
rayin Report post Posted September 27, 2019 On 9/23/2019 at 9:27 PM, Elkhartjim said: I'm interested in desulfating the batteries. I did this with my previous coach coach house batteries and they were 8 years old and still holding a good charge when I sold it. I'm not going to mention using mineral oil in each cell and I'm not going to mention I had no corrosion issues either. This Battery Minder model says it works with up to 6, 12V batteries: https://www.batterystuff.com/battery-chargers/12-volt/restore/batteryminder-12v-model-128cec1.html That should cover your 4,,12V battery bank, plus your coach batteries, if you wish. Then I won't mention Interstate Battery sells the Battery MInder version of "mineral oil". https://www.batterystuff.com/battery-restoration/fluid/battery-equaliser-12-ounce-bottle-be12oz.html If I ever go back to open lead-acid batteries, have been using SLA, I will use that or mineral oil. Share this post Link to post Share on other sites
elkhartjim Report post Posted September 27, 2019 It darn sure works. Another benefit is only need to add water about every 10-12 months and there is absolutely no corrosion issues. We're possibly opening a can of worms, Ray. Share this post Link to post Share on other sites
