raylen Posted December 12, 2016 Report Share Posted December 12, 2016 I always get mixed up. When joining two 12 volt batteries together, how are the cables hooked up to keep 12 volts. Thank you in advance. SKP 980101990 Bounder 27D by FleetwoodRay and Elen living this beautiful life style and exploring this beautiful country Link to comment Share on other sites More sharing options...
Ed ke6bnl Posted December 12, 2016 Report Share Posted December 12, 2016 plus to plus and minus to minus 2000 National RV Sea Breeze 5th wheel 30ft. So.California 1950 F1 street rod 1949 F1 stock V8 flathead 1948 F6 350 chevy/rest stock, no dump bed shortened frame. 1953 chevy 3100 AD for 85 S10 frame 1968 Baha Bug with 2.2 ecotec motor 170 hp, king coil-overs,etc 1970 Baha Bug wihg 2332cc, King coil overs and everything else there is. 1998.5 Dodge 2500 4x4 Cummins, turbo, trans, injectors, lockers, bigger turbo,edge EZ upgrades for towing 35" BFG's, air dog lift pump etc. Link to comment Share on other sites More sharing options...
hemsteadc Posted December 12, 2016 Report Share Posted December 12, 2016 It's called parallel. Link to comment Share on other sites More sharing options...
oldjohnt Posted December 12, 2016 Report Share Posted December 12, 2016 As shown wiring two 12 volt batteries in parallel maintains the same 12 volts, while the available Amp Hours of energy storage is additive. In series (like two 6 volters to make 12 volts) voltage is additive but the Amp Hours IS NOT. When combining batteries its best if they are identical in age and type and brand, size and rating. For RV use I recommend true deep cycle (golf cart type) batteries versus the cheaper semi deep cycle so called RV Marine Batteries like sold at Wally World for boat owners. John T Link to comment Share on other sites More sharing options...
Dennis M Posted December 13, 2016 Report Share Posted December 13, 2016 Here ya go: The 12 Volt Side of Life Dennis & NancyTucson, AZ in winter, on the road in summer.1999 Volvo 610 "Bud" 425 HP Volvo, Super 10 spd.2005 Mountain Aire 35 BLKS2013 smart fortwo CityFlame riding on Bud(Replaced '05 smart first loaded in '06 and '11 smart that gave it's life to save me!)Our Travel Blog Link to comment Share on other sites More sharing options...
Kirk W Posted December 13, 2016 Report Share Posted December 13, 2016 plus to plus and minus to minus That's it! Good travelin !...............KirkFull-time 11+ years...... Now seasonal travelers.Kirk & Pam's Great RV Adventure Link to comment Share on other sites More sharing options...
oldjohnt Posted December 14, 2016 Report Share Posted December 14, 2016 While its the simplest form, ONLY two batteries wired in parallel, as Ed G's picture correctly shows, note that POS terminal of Battery B connects to the charging unit and loads while the NEG terminal of Battery A connects to Ground. THAT IS CORRECT AS OPPOSED TO the POS and NEG of only one battery being used, which although it would still "work" DOES NOT YIELD AS GOOD BALANCE AS IF WIRED PER ED'S PICTURE !!!!!!!!!!!!! For a more detailed explanation of proper battery parallel wiring see http://www.smartgauge.co.uk/batt_con.html you wont believe how much of a difference it can make. John T Link to comment Share on other sites More sharing options...
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