The shunt reducing the available voltage by 150mv or so should be insignificant. But it would be worthwhile to check the shunt for heating which could mean a poor connection. Shunts are generally large masses of brass/copper and be able to allow a large current without significant heating. The 100A/100mV shunt has a resistance of 1milli-ohm and at 150A will produce 22.5W of heat which it has to dissipate. Compare that to the motor at 150A/48V = 7.2KW.
I think you said you have a 5KW system. Maybe 7.2KW has something to do with the Sevcon overheating? I don't know how well it does, but may be the problem. How about the motor??
John
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Posted by: jcacord@gmail.com
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