Bobfirst Posted November 26, 2018 Share Posted November 26, 2018 I feel stupid asking but only one way to learn ! Link to comment Share on other sites More sharing options...
Overland Posted November 26, 2018 Share Posted November 26, 2018 Parallel for 12 volt. But to make sure that it's confusing, if you get the AGMs, then they're 6-volt and will be paired, two each in series then the two sets are paralleled. There's a diagram in the back of the manual that shows exactly how they should be connected. [attachment file=Screen Shot 2018-11-26 at 6.11.38 PM.png] 3 Link to comment Share on other sites More sharing options...
Bobfirst Posted November 27, 2018 Author Share Posted November 27, 2018 Does one battery tender monitor both 12V batteries since they are in parallel? Link to comment Share on other sites More sharing options...
Overland Posted November 27, 2018 Share Posted November 27, 2018 That’s correct, though battery monitors and chargers don’t really care how the batteries are connected. Some are more advanced, but in general they just look at the voltage of the system as a whole to determine the state of charge. 4 Link to comment Share on other sites More sharing options...
RnA Posted November 29, 2018 Share Posted November 29, 2018 A 6 volt battery has 3 cells in series @ ~2 volts. A 12 volt battery has 6 cells in series. Same as hooking 2 6 volt batteries in series. The voltage adds as cells are added in series. The amp-hour capacity stays the same. Two 6 volt 100 amp-hour batteries in series will be 12 volts 100 amp-hours. Two 6 volt 100 amp- hour batteries in parallel will be 6 volts 200 amp-hours. I say ~ 2 volts per cell because at full charge and rested a 6 volt battery is really closer to 6.3 volts and a 12 volt battery is closer to 12.6 volts or ~ 2.1 volt per cell. A good resource is Harold Barre’s book <u>Managing 12 Volts - How to Upgrade, Operate and Troubleshoot 12 Volt Electrical Systems.</u> -Randy 3 2018 LE2 STD #365 2018 GMC 2500HD SLT Duramax 4x4 Link to comment Share on other sites More sharing options...
Moderators topgun2 Posted November 30, 2018 Moderators Share Posted November 30, 2018 Hopefully I'm not stepping on anyone's copyright toes but I found this over on the Fiberglass RV Forum: http://www.marxrv.com/12volt/12volt.htm http://www.marxrv.com/12volt/12volta.htm Bill 3 2023 Ford F150 Lariat 3.5EB FX4 Max Towing, Max Payload, 2016 Oliver Elite II - Hull #117 "Twist" Near Asheville, NC Link to comment Share on other sites More sharing options...
Moderator+ ScubaRx Posted November 30, 2018 Moderator+ Share Posted November 30, 2018 "Are 12V batteries hooked up in series or parallel?" 12 Volt batteries are always hooked up parallel if your intention is to keep the system at 12V. 2 Steve, Tali and our dog Rocky plus our beloved Storm, Lucy, Maggie and Reacher (all waiting at the Rainbow Bridge) 2008 Legacy Elite I - Outlaw Oliver, Hull #026 | 2014 Legacy Elite II - Outlaw Oliver, Hull #050 | 2022 Silverado High Country 3500HD SRW Diesel 4x4 Link to comment Share on other sites More sharing options...
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