[RE-wrenches] Lithium battery cable lengths

Tue Jul 20 18:53:43 EDT 2021

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 <re-wrenches-bounces at lists.re-wrenches.org> on behalf of jay <jay.peltz at gmail.com>
Sent: Tuesday, July 20, 2021 4:13:41 PM
To: RE-wrenches <re-wrenches at lists.re-wrenches.org>
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 < bchurchill at energy-1.net<mailto:bchurchill at energy-1.net>> wrote:

If each lithium battery has an internal BMU and your wires are sized properly for their output it does not matter.
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From: RE-wrenches <re-wrenches-bounces at lists.re-wrenches.org<mailto:re-wrenches-bounces at lists.re-wrenches.org>> on behalf of Dave Angelini Offgrid Solar <offgridsolar at sti.net<mailto:offgridsolar at sti.net>>
Sent: Tuesday, July 20, 2021 4:02:20 PM
To: RE-wrenches <re-wrenches at lists.re-wrenches.org<mailto:re-wrenches at lists.re-wrenches.org>>
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
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text 209 813 0060

On Tue, 20 Jul 2021 14:58:10 -0600, Jay <jay.peltz at gmail.com<mailto:jay.peltz at gmail.com>> 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. Seems to me that physics says battery 1 gets more work than
> battery 6
>
> Thanks
>
> Jay
>
> Peltz power.
>
>
>
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