Bradley,
Have you cleaned the contacts and inspected the cable terminals? Or possibly the shunt itself may have corroded. The resistive elements and the copper ends are often of dissimilar metals. You may try turning the load on and putting a voltmeter across each terminal and connection to see where the loss is occurring.
Ned
On Jan 10, 2014, at 4:34 PM, semicolonsutra wrote:
Hello,
I have a ME0913/Gen4 controller powered by four 12V batteries connected in series and off the negative lead of the 48V pack I have a shunt (I believe it is 50mV/250AMP) to measure the voltage. I was down at the boat today and ran the motor while tied to the dock and after about 30 minutes of run time I noticed a small but distinct smoldering smell (the smell you would get if you left a hot iron on a piece of wood). I turned off the motor, disconnected the battery and searched around for the problem. It turns out the lead from the negative terminal to the battery pack leading to the shunt was quite hot--probably about 100C. The shunt is mounted to wood (it is a wooden boat) and that from the negative terminal to the shunt gets hot when the motor was running. The shunt mounting screws were hot and heated up the wood. Alas, that is the situation. Now this does not seem right but I'm not sure what the problem might be. Any ideas? Thanks in advance.--Bradley
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