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BMV 712 Battery Shunt Overheating

What would cause the battery shunt (500A / BMV 712) to reach temps of ~ 85C using 4/0 cables to / from battery terminals (6 X Lion Energy Safari UT-1300 in parallel)? The BMV continue to operate with no issues showing all relevant data even with the high temps during inverting using multiplus 12V/3000/50. Less than 1,000 watts inverting temperature is reasonable, > 2,000 watts overheating takes place. The POS terminal is reading temps of ~85C - 90C. Below is a photo of the wiring / batteries. Any suggestions welcome or the shunt may be defective.

vc-shunt-23.jpg

BMV Battery Monitor
vc-shunt-23.jpg (2.1 MiB)
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