[RE-wrenches] GT with BB

[Amos Post]

Hi Bill,

I’m curious where you source your bussing and/or especially the “bridge” pieces?  

Thanks,
Amos


       Amos Post
   Integrity Energy
  W 802.763.7023
   C 802.291.2188
    ienergyVT.com <http://www.ienergyvt.com/>
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> On Sep 22, 2023, at 7:45 PM, Jay via RE-wrenches <re-wrenches at lists.re-wrenches.org> wrote:
> 
> Hi Bill
> 
> Looks good to me!
> 
> I like the idea of all the copper/connections behind a plexiglass dead front. Makes a lot of sense and seems safe. 
> I’m wondering what your inspectors say about it or how you convince them?  
> 
> It’s definitely got me thinking about doing a job I have in mind with buss bars and plexi dead front vs 4/0 cable. 
> 
> Jay
> 
>> On Sep 21, 2023, at 9:25 PM, frenergy via RE-wrenches <re-wrenches at lists.re-wrenches.org <mailto:re-wrenches at lists.re-wrenches.org>> wrote:
>> 
>> Jay,
>> 
>>            I sent a diagram of my proposed arrangement and bus sizes to SimpliPhi prior to installation, which they approved. The buses (copper 11000) running across the terminals are 1 1/2" X 3/16", they have a rating of 480 amps.  The "bridge" buses are 2" X 3/16" with a rating of 610 amps.  The greatest possible charge-discharge on this pack will be ~327 amps which is only 16 amps per battery.  Typically the max supply is 11.5 amps, loads are less (1, 8048 Radian). The inverter cables are pairs ( +& -) of 4/0. Picture attached.
>> 
>>             I'm never going to reach the 30 degree C. rise in temp with these amperages. The reasoning was the amps moving to each battery is so small that even though the batteries at the ends of the buses have more bus to move through, they are so over-sized that there would be a negligible difference in voltage, small enough for the BMS to handle.
>> 
>>            I guess the answer to your question is send your proposal to the battery manufacturer, there are charts all over the internet for bus ampacities. The final touch on the way for this installation is a full sheet of plexiglass mounted on the front of the pack with multiple stand-offs. BTW, the structural is #1, 4 X 6" doug fir, its a 76 Kwhr pack to 100% DOD. We do a lot of car charging around here.
>> 
>> Bill
>> 
>> Feather River Solar Electric
>> Bill Battagin, Owner
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>> 
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