Inverter tripping

Have a solis inverter on a 12kw system.
It is giving bother tripping out on a dull morning on start up.
Seems to get going ok on a bright morning anyone know what would cause this??
 

akaPABLO01

Member
Have a solis inverter on a 12kw system.
It is giving bother tripping out on a dull morning on start up.
Seems to get going ok on a bright morning anyone know what would cause this??

Reads like another mc4 earth leakage. The connector cable from inverter to the series of solar panels is wet. Is there a code on the display?
 

f0ster

Member
usually when you get a mc4 getting wet the inverter comes up with an isolation fault on the DC side. I have had one of these doing what you described and it needed two of the phases swapped over, they have a technical dept just give them a ring, you will need to make out you are the installer and not the owner so it helps if you can talk technical about solar to show you know what you are doing
 

akaPABLO01

Member
usually when you get a mc4 getting wet the inverter comes up with an isolation fault on the DC side. I have had one of these doing what you described and it needed two of the phases swapped over, they have a technical dept just give them a ring, you will need to make out you are the installer and not the owner so it helps if you can talk technical about solar to show you know what you are doing

If it's only tripping in the morning then it's Earth leakage
 

Exfarmer

Member
Location
Bury St Edmunds
We are having issues with our Solis inverter tripping the RCD (Earth).

Did you resolve your issue?
- if so, how?

Thanks in advance
Mike
If your problem is earth leakage I am afraid it is not good news if it is roof mounted. A common fault is these systems when they were installed the connectors were supposed to be tied up out of harms way. However this took time at least 20 seconds and a cable tie and often they were just left dangling across the ridges. sadly over time they drop into the channels and a build up of moss and dust etc makes a little dam around the MC4 this can form quite a pool of muddy sludge which eventually penetrates the MC4 possibly causing a direct leakage to the roof on a damp day or corrosion internally which leads to shorting and finally a total burn out of the connection which leads to failure of that circuit.
You must get the circuits tested out for voltage and resistance to earth. I am afraid that you may be in for a big bill. Its no comfort but we have just had to strip off and replace a 60 Kw array array for this problem. I suspect a lot will be in exactly the same position.
The situation is compounded if you replace some of the old inverters with new ones as the standard for resistance has gone up.
So we have an old array which tests 30,000 Ohms on a damp day and the inverter is just happy with a new one will would want a minimum of 100,000 Ohms. A good array on a dry day will probably read in the order of 5,000,000 OHMs to put it in perspective but all arrays will have a little leakage on a damp day
 

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