I think you’ll find it stated in the Blue Planet installation manual. I’ve installed dozens of their systems over three years and never paid attention to cable length. One solar self consumption system I let run over the winter without ever reaching a full charge and the cabinets didn’t drift more than 10% SOC from each other. Blue planet does recommend a full charge at least once per month for balancing though. Matched cable length, again assuming properly sized, really doesn’t matter anymore. ________________________________ From: RE-wrenches <[email protected]> on behalf of jay <[email protected]> Sent: Tuesday, July 20, 2021 4:13:41 PM To: RE-wrenches <[email protected]> Subject: Re: [RE-wrenches] Lithium battery cable lengths
HI Barton, OK so please explain how the BMU/BMS is controlling watt hrs between the batteries as I’ve not heard that this is possible. The batteries are Blue planet jay On Jul 20, 2021, at 4:04 PM, Barton Churchill < [email protected]<mailto:[email protected]>> wrote: If each lithium battery has an internal BMU and your wires are sized properly for their output it does not matter. ________________________________ From: RE-wrenches <[email protected]<mailto:[email protected]>> on behalf of Dave Angelini Offgrid Solar <[email protected]<mailto:[email protected]>> Sent: Tuesday, July 20, 2021 4:02:20 PM To: RE-wrenches <[email protected]<mailto:[email protected]>> Subject: Re: [RE-wrenches] Lithium battery cable lengths Seems wrong to me! The lengths need to be very close. Why would you not do this Jay? Dave Angelini Offgrid Solar "we go where powerlines don't" https://us-west-2.protection.sophos.com?d=sti.net&u=aHR0cDovL21lbWJlcnMuc3RpLm5ldC9vZmZncmlkc29sYXIv&i=NWY3Yjg4NTEwMTMzZWYwZjc4ZDZiZjM0&t=ZURpZGJ5TUxIbHJ6RnlSV1R6dVh6R2ZzMXM1dktRb2kxakRuQzRYa1hwMD0=&h=6f930d7a17ae43adac2b296e969243f1<https://us-west-2.protection.sophos.com/?d=sti.net&u=aHR0cDovL21lbWJlcnMuc3RpLm5ldC9vZmZncmlkc29sYXIv&i=NWY3Yjg4NTEwMTMzZWYwZjc4ZDZiZjM0&t=ZURpZGJ5TUxIbHJ6RnlSV1R6dVh6R2ZzMXM1dktRb2kxakRuQzRYa1hwMD0=&h=6f930d7a17ae43adac2b296e969243f1> e-mail [email protected]<mailto:[email protected]> text 209 813 0060 On Tue, 20 Jul 2021 14:58:10 -0600, Jay <[email protected]<mailto:[email protected]>> wrote: > Hi all > > I’ve got a design for a lithium battery that has a 12’ longer run from > furthest battery vs closer battery. 6 batteries in all. So lengths go from > 0-12’ plus to the combiner/ disconnect. > > What is the feeling about running different lengths vs making them all the > same length? > > How would this effect use of the batteries. Tech support has said no > worries. 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