C35 Problem [RE-wrenches]

[Louis Woofenden]

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Hi,

I've just run into a problem with a Xantrex C35 charge controller, and I'd 
like to know if anyone has experienced a similar problem. This problem 
occurred with three different units, which would seem to point to the 
installation, or something in the surrounding system, but I cannot find 
anything. A call to Xantrex tech support yielded no useful information.

Anyhow, here’s the problem:

When I apply power from the battery to the controller it turns on normally, 
and starts to regularly blink a single blink. When I turn on the array 
charging current (about 13 amps @ 12 volts), the controller will charge for 
2-10 minutes, and then will simply quit. No lights, no charge current, etc. 
If I disconnect the controller for a few minutes, I can repeat this cycle 
when I reconnect.

The controller is installed in a system running fans for a remote restroom. 
Other loads on the system include a 120v sump pump running off a 2.5 KW 
mod-sine inverter (controlled by a solenoid), and a few lights on a timer. 
The only other piece of equipment in the system is an old meter, which is 
measuring the voltage, array current, etc.

Oh, one more thing. Can anyone tell me what the difference is input vs. 
output voltage should be on a C-series controller? I’m seeing a difference 
of about .05 volts between the input from the PV, and the output to the 
battery. Is that about right?

Any ideas would be much appreciated.

Best,

Louis Woofenden

The Solar Store
Tucson, AZ

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