I have a pair of Schneider Electric MPPT 80 600 charge controllers. Each controller has 12 panels feeding it 3,880 watts. It's been working fine for about 6 years.
The only time my system has thrown a code is when I had an attempted burglary 3 years ago and they flipped the breakers from the meter pole and it was 4 days later running 100% solar that I realized it. All has been well since then. It's a grid tied system.
Today I notice one of the MPPT's is showing on it's face panel that it's had an "Event". Looking at my SCP it shows that one of them is showing a F74 code. That's a input overvoltage fault. Says that it would of exceeded 600v and needs to be cleared by the SCP according to the manual. Well, I'm not able to clear it manually. It just beeps continuously when I select clear faults, and doesn't clear anything. So I'm thinking the problem still exists ( the sun is shining and it's a clear sky) not allowing it to clear.
So I disconnect via the fuse breaker in the Midnight Solar Combiner boxes at the array. While the other MPPT is controlling away and happy showing 3k-ish on the inverter, the faulted MPPT is showing solid on the charging green light, and the Event light is still red. I try clearing the fault again with the SCP and get the same beeping with no action. The charging light blinks on the working one. So I assume blinking is charging, solid is charging mode, but not charging.
I have voltage from the array in the MS Combiner box at the panels. I didn't have my meter that would tell me how much, I just had one of those red gizmos with the probes for testing AC or DC voltage and it was pegging the 600V line. Don't believe it should of been.
With the fuse back in at the MSC box, I looked at the meter reading in the SCP for each MPPT. The working and non faulted is showing
PV In Power 3134W
PC In 7.2A 433V
DC Out Power 2937W
DC Out 51.5A 57.0V
The Faulted one is showing
PV In Power 37 W
PC In 0.1A 531V
DC Out Power 2W
DC Out 0.1A 56.9V
On the faulted one, how can the voltage be so high (531) and the Watts so low (37)? That probably means something to somebody, but seems
backwards to me.
Nothing visually wrong with any of the connectors at the array. We had a lot of wind a couple days ago, and temps around zero. Wouldn't be the firs time.
It does say in the manual that the F74 if exceeding 600 volts, damage to the charge controller is possible. Then it says to reset the fault. It won't reset.
One more thing. Looking at the fault log, it was showing a handful of them over a day or two. But the other MPPT was showing the same thing, but wasn't
showing a red Event light and it's working fine.
Any ideas would be appreciated. Damaged MPPT? Bad Panel? Loose Connection?
The only time my system has thrown a code is when I had an attempted burglary 3 years ago and they flipped the breakers from the meter pole and it was 4 days later running 100% solar that I realized it. All has been well since then. It's a grid tied system.
Today I notice one of the MPPT's is showing on it's face panel that it's had an "Event". Looking at my SCP it shows that one of them is showing a F74 code. That's a input overvoltage fault. Says that it would of exceeded 600v and needs to be cleared by the SCP according to the manual. Well, I'm not able to clear it manually. It just beeps continuously when I select clear faults, and doesn't clear anything. So I'm thinking the problem still exists ( the sun is shining and it's a clear sky) not allowing it to clear.
So I disconnect via the fuse breaker in the Midnight Solar Combiner boxes at the array. While the other MPPT is controlling away and happy showing 3k-ish on the inverter, the faulted MPPT is showing solid on the charging green light, and the Event light is still red. I try clearing the fault again with the SCP and get the same beeping with no action. The charging light blinks on the working one. So I assume blinking is charging, solid is charging mode, but not charging.
I have voltage from the array in the MS Combiner box at the panels. I didn't have my meter that would tell me how much, I just had one of those red gizmos with the probes for testing AC or DC voltage and it was pegging the 600V line. Don't believe it should of been.
With the fuse back in at the MSC box, I looked at the meter reading in the SCP for each MPPT. The working and non faulted is showing
PV In Power 3134W
PC In 7.2A 433V
DC Out Power 2937W
DC Out 51.5A 57.0V
The Faulted one is showing
PV In Power 37 W
PC In 0.1A 531V
DC Out Power 2W
DC Out 0.1A 56.9V
On the faulted one, how can the voltage be so high (531) and the Watts so low (37)? That probably means something to somebody, but seems
backwards to me.
Nothing visually wrong with any of the connectors at the array. We had a lot of wind a couple days ago, and temps around zero. Wouldn't be the firs time.
It does say in the manual that the F74 if exceeding 600 volts, damage to the charge controller is possible. Then it says to reset the fault. It won't reset.
One more thing. Looking at the fault log, it was showing a handful of them over a day or two. But the other MPPT was showing the same thing, but wasn't
showing a red Event light and it's working fine.
Any ideas would be appreciated. Damaged MPPT? Bad Panel? Loose Connection?
