[RE-wrenches] Lithium battery cable lengths

[bob at midnitesolar.com]

Remember that cable resistance isn't the only thing to think about for 
battery cables from inverter to batteries...

Cable inductance can matter too which is made better by keeping positive 
and negative cables close together and also keeping them short as possible.

boB


On 7/21/2021 3:19 PM, jay wrote:
> HI Nick,
>
> Yes my friend called them directly, he was working with them on this project and they said no problem with unequal cable lenghts.
>
> jay
>
>
>
>> On Jul 21, 2021, at 2:27 AM, Nick A Lucchese <lucchesesolar at me.com> wrote:
>>
>> Good evening Barton and Jay,
>>
>> Is this recent that Blue Planet’s tech support says not to worry about parallel cable lengths? They’ve said for years to try and match them and it is even noted that “All parallel battery connections to be of equal length” on the three line diagram on page 31 of the rev 071219 B manual that they’ve been including with the 2.0 cabinet for the last couple years. The other few competing LiFePO4 manufacturers currently on the market mention it in their manuals as well. Seems like an odd departure all of a sudden if you heard otherwise? I don’t see it in the HI manual so maybe they determined it’s not important anymore?  Certainly would save a lot of copper on my BI installations if they no longer are concerned about it. I’ve been meticulously matching lengths for years!
>>
>> Nick
>>
>>> On Jul 20, 2021, at 1:58 PM, Jay <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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