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CC is unresponsive

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Sonnyboy

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Jul 17, 2022
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I have a 50amp Epever 5414an

I came out to the shed to find the MT50 module reading “connecting…”
I tried resets but nothing worked. Hooked up a CC meant for gel batteries and got no response.
Checked my fuses on the roof panels, all have continuity.

The 80amp fuse in the CC is good.

What would you do next to problem solve?
 

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How many panels? Check all the connections (MC4, combiners, Ys, etc). You have an open connection someplace.
 
If there’s an open connection, I’m sure not finding it…
Not getting power with just the battery hooked up to it.

The inverter turns on when hooked up to the battery.
 

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Sonnyboy said:
If there’s an open connection, I’m sure not finding it…
Not getting power with just the battery hooked up to it.

The inverter turns on when hooked up to the battery.
Click to expand...
Additional info: panel cables coming into CC read 46dc volts which is right
But unless I am not using the meter correctly(100% possible) it isn’t giving me any amps…could that be a clue?
 
That’s the panel pos. It is getting power to the unit via the battery, but the led is not lighting up and the MT50 is not communicating with it…connecting….is the read out. Anyone know how to test if the unit is bad?
 
Sonnyboy said:
But unless I am not using the meter correctly(100% possible) it isn’t giving me any amps…could that be a clue?
Click to expand...
Amps are pulled from the array by the SCC. How and where are you trying to measure amps?

Sonnyboy said:
That’s the panel pos. It is getting power to the unit via the battery,
Click to expand...

Screen Shot 2023-12-21 at 10.17.45 AM.png
Thats definitely the battery icon where the red wire should be connected BEFORE the array is connected.
 
MisterSandals said:
Amps are pulled from the array by the SCC. How and where are you trying to measure amps?



View attachment 184347
Thats definitely the battery icon where the red wire should be connected BEFORE the array is connected.
Click to expand...
My bad, disregard this photo…this was the CC I hooked up after my 5415 stopped working. It has the opposite hook up locations for panel and battery.
 
yodamota said:
you have the panel positive connected to the inverter?
Click to expand...
No the panels are connected to the CC only. I am wondering if something could be fried in the cc? It seems to be working but not controllable. My battery is maintaining a charge with the sun while charging the freezer. I heard clicks from time to time in the CC.
 
Sonnyboy said:
No the panels are connected to the CC only. I am wondering if something could be fried in the cc? It seems to be working but not controllable. My battery is maintaining a charge with the sun while charging the freezer. I heard clicks from time to time in the CC.
Click to expand...
This does not make any sense. Is the battery connected to the SCC or not?
 
MisterSandals said:
This does not make any sense. Is the battery connected to the SCC or not?
Click to expand...
I’m not sure what doesn’t make sense.
The battery and panels are connected to the SCC. The Multimeter reading of the panel wires going into the SCC read 46volts. The wires going into the battery terminals of the SCC read 14v. Tell me how I am not being clear.
 
This breaker is suspect - My understanding is they're crap.
1703187698264.png
What happens if you bypass it?
 
There is a lot of glare, but it looks like the SCC display is completely blank? And the MT-50 shows "connecting"?

And the wiring between your 2 SCCs is this different in regards to +/- from battery?
+/- -/+ vs +/- +/-

Screen Shot 2023-12-21 at 11.41.55 AM.pngScreen Shot 2023-12-21 at 10.17.45 AM.png

SparkyJJO said:
This breaker is suspect - My understanding is they're crap.
Click to expand...
I was going to get into this too. So the wiring from the battery, originating in the lower left, passes they a switch, then a fuse, joined at the inverter and then thru a breaker? This seems overly complicated and probably a source of why you cannot tell what is going on.

I would run a wire direct from SCC to the battery. Most run direct.

Then when you get this working, start messing with the inverter. I'd consider wiring from the battery a fuse (based on total max loads + 25%), cutoff switch (protected by previous fuse) and then a bus bar. Connect SCC to this bus bar too.
 
So completely disregard the lower SCC in your post. I only have one SCC hooked up as depicted in the photo I sent of my set up. The LCD is indeed blank. And the MT50 reads “connecting…”

I will try to bypass the 50amp fuse though I am skeptical that this is the issue in this case. As for the placement of that fuse, I got this configuration from a Will Prowse video so I was just following that. And it has all been working for nearly a year.
 
Bypass did not work. I can hear the SCC clicking on and off when I engage/disengage the fuse. The fuse, while maybe not a good fuse, isn’t the issue here.
 
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