[RE-wrenches] GT with BB

[frenergy]

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
4291 Nelson St.(shipping)
5575 Genesee Rd. (USPS, UPS)
Taylorsville, CA 95983
530.284.1925 Office/ 530.258.1641 Cell
CA Lic 874049
Solar powered since 1982
Home of the Sunny side up


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