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Old 01-19-2019, 05:06 PM   #1
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Solar charge controller help

HELP! We have a Mppt charge controller and we’re having problems with it. When our solar panels get completely charged we get an error that says over voltage disconnect voltage. And we have to take the positive of our solar panel off the charge controller. It’s like the charge controller isn’t stopping the charge from going to our batteries when their full. We just have the solar panels, inverter (usually always off), fuse box, charge controller, batteries. We put the system together ourselves. Are we missing anything?
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Old 01-20-2019, 07:38 AM   #2
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You should get some DC breakers before and after your charge controller. Sounds like your controller isn't properly sized for your panels.

Post the specs for your panels and specs for your controller. That will help people help you
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Old 01-20-2019, 01:36 PM   #3
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I have 4 100 watt solar panels 12 volt and 33.3 amps. Charge control is 40amp
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Old 01-20-2019, 03:30 PM   #4
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You didn't say how many amp controller. It should have a setting to control the over charge voltage. It should cut off. Check your settings.
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Old 01-20-2019, 05:13 PM   #5
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I have the mppt tracer4210A. I don’t know how to change the settings I couldn’t find it anywhere. I figured out how to tell it what size and type my batteries are but that was it
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Old 01-20-2019, 05:32 PM   #6
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Originally Posted by Jamie23 View Post
I have the mppt tracer4210A. I don’t know how to change the settings I couldn’t find it anywhere. I figured out how to tell it what size and type my batteries are but that was it
Charge and discharge current is 40a on that unit.
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Old 01-20-2019, 06:53 PM   #7
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Yes I said it was 40amp above
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Old 01-21-2019, 07:06 AM   #8
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Originally Posted by Jamie23 View Post
HELP! We have a Mppt charge controller and we’re having problems with it. When our solar panels get completely charged we get an error that says over voltage disconnect voltage. And we have to take the positive of our solar panel off the charge controller. It’s like the charge controller isn’t stopping the charge from going to our batteries when their full. We just have the solar panels, inverter (usually always off), fuse box, charge controller, batteries. We put the system together ourselves. Are we missing anything?
Nothing obvious comes to mind.

You should have a fuse/circuit breaker between the array and charge controller (CC) and also between CC and battery bank. The distance between CC and battery should be as small as possible (few feet). Do you have a voltage sense line from battery bank & CC? If not and your CC supports it, it is worth adding.

Are your panels in series or parallel? (what is theoretical maximum voltage going into CC and can it take that voltage)? In other words, if your panels are in series and produce 15-ish volts maximum, then your CC may be seeing up to 60-ish volts.
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Old 01-21-2019, 10:31 AM   #9
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Max input voltage on the 4210a is 100vdc.

Even If you had 4 (12v) panels in series you should not have an overvoltage issue.

I would suspect that the charge controller may be defective. Have you contacted the manufacturers tech support?
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Old 01-21-2019, 10:50 AM   #10
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Nothing obvious comes to mind.

You should have a fuse/circuit breaker between the array and charge controller (CC) and also between CC and battery bank. The distance between CC and battery should be as small as possible (few feet). Do you have a voltage sense line from battery bank & CC? If not and your CC supports it, it is worth adding.

Are your panels in series or parallel? (what is theoretical maximum voltage going into CC and can it take that voltage)? In other words, if your panels are in series and produce 15-ish volts maximum, then your CC may be seeing up to 60-ish volts.
I have fuses on all my panel lines and a fuse from the CC to the batteries. My panels are in parallel, 4 100watt at 12volt 33.3amp
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