PV voltage input changing

Discussion about the MX60 Charge Controller

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PV voltage input changing

Postby drjaredshelton on Wed Aug 01, 2018 2:30 pm

I have two charge controllers for my 30 panels. They usually read the same input voltage of about 80-90v coming in. Recently one of the charge controllers goes into silent mode and then the PV input readout says about 40v. I can't get it to wake up on its own. If I flip the breaker on and off and reset the CC it will usually wake up and read the correct 80-90v coming in again, but not consistently. Nothing else has changed or been messed with. Any ideas?
30 280w panels/ 8battery bank- 6v 430Ah/ Two GS8048A radian inverters/ two FM80-150VDC CC/ Mate3s
Site: Bear River Chiropractic
drjaredshelton
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Re: PV voltage input changing

Postby Mike Curran on Wed Aug 01, 2018 5:57 pm

It could be the charge controller but that would be the least likely scenario, IMO.

You might have a loose connection at the breaker or the breaker itself is faulty.

Which breaker are you flipping on and off? If it's more than one, like at the PV combiner, maybe one of those breakers is tripping and you're resetting it while flipping them on/off. Why it's tripping is TBD.

If it's just the one PV input breaker to the charge controller, then I'd go with my first theory. Check for loose connections, preferably with the breakers at the combiner turned off so there's no PV input voltage where you're checking. Careful!
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Re: PV voltage input changing

Postby drjaredshelton on Thu Aug 02, 2018 9:42 am

So the label on the breaker says "Solar Arc detection" It isn't tripped at all, but if I cycle it the second cc wakes up, tracks, and then goes into equal voltage input as the other cc, and goes into normal bulk mode. Its the only way I've found to wake it up after it goes silent. I've tried just the breaker to that cc, turning it off and back on, but stays in silent and the input voltage is the same as before, low.

It also doesn't do it at any specific time. Sometimes it works normally for days, other times it will go into silent after a few hours. Am I missing a setting or something set too low? (set at 1hr default) Absorb time?
30 280w panels/ 8battery bank- 6v 430Ah/ Two GS8048A radian inverters/ two FM80-150VDC CC/ Mate3s
Site: Bear River Chiropractic
drjaredshelton
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Posts: 28
Joined: Mon Mar 26, 2018 9:09 am
My RE system: 30 280w panels, 8- 6v 430Ah.

Re: PV voltage input changing

Postby Mike Curran on Thu Aug 02, 2018 2:32 pm

So there are 2 breakers in series between your array and charge controller, one labelled "solar arc detection" and the other is a conventional breaker (I'm assuming). If so, that's an odd arrangement, usually a single breaker incorporates all the various functions (overcurrent, ground fault, arc fault, etc.).

"Solar arc detection" means the breaker detected an arc (spark) somewhere in the PV panel wiring. When you cycle that breaker you're actually resetting it from a fault condition, and it should feel as if it's not fully in the "on" position when you first switch it off. This isn't a problem with your charge controller settings, it's a wiring issue somewhere in the connections amongst your PV panels. Perhaps one of the MC4 (if used) connectors between panels isn't plugged in all the way.

I don't have arc fault protection breakers on my PV system but I do have one supplying the 120V outlets in my barn and have experienced this kind of arc fault trip sometimes when I run my shop Vac out there. Not really relevant to your problem, and not to confuse matters...but the breaker does feel like it's not fully on when this happens. Maybe your breaker doesn't work as mine does.
http://www.tigoenergy.com/site.php?95b2dca2-ca6c
Mike Curran
Forum Czar
 
Posts: 861
Joined: Sat Aug 28, 2004 6:28 pm
Location: Chagrin Falls, Ohio
My RE system: Outback:
- 8 (2x4) Evergreen 180's into one MX60
- 6 (2×3) ALEO S79-300's into one FM80
- 2 grid-tied GVFX3524's classic stacked for 120/240VAC
- 12 Surrette/Rolls 2V x 1766Ah
- Hub10.3, Mate3, FNDC, RTS, OpticsRE. Tigo Energy ES maximizers on each PV module.

Westinghouse Solar:
- 30 (2x15) 235W panels with Enphase M215 microinverters, grid-tied.

Re: PV voltage input changing

Postby drjaredshelton on Thu Aug 02, 2018 2:38 pm

Something is up with it for sure. I'm trying to get ahold of my installer, but once the put it in, they kind of kicked me to the curb for any further assistance :mad: This is helpful info though. Thanks.
30 280w panels/ 8battery bank- 6v 430Ah/ Two GS8048A radian inverters/ two FM80-150VDC CC/ Mate3s
Site: Bear River Chiropractic
drjaredshelton
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Posts: 28
Joined: Mon Mar 26, 2018 9:09 am
My RE system: 30 280w panels, 8- 6v 430Ah.

Re: PV voltage input changing

Postby Solardad on Thu Nov 15, 2018 6:55 pm

Hi -wondering if you were able to resolve...?
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Re: PV voltage input changing

Postby drjaredshelton on Fri Nov 16, 2018 9:24 am

Not really solved. I keep an eye on it and when it happens if I just flip the breaker to the PV array on and off it will reset and go back to normal operation. Seems like in the summer I have to do that about once every week to week and a half. In the cooler fall and now moving to winter it hasn't had an issue so far for several months now.
30 280w panels/ 8battery bank- 6v 430Ah/ Two GS8048A radian inverters/ two FM80-150VDC CC/ Mate3s
Site: Bear River Chiropractic
drjaredshelton
Forum Whiz
 
Posts: 28
Joined: Mon Mar 26, 2018 9:09 am
My RE system: 30 280w panels, 8- 6v 430Ah.


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