Growatt stops the PV when sunny and when load is connected
- Thread starter Arne999
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Texas-Mark
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What is the first column? PV voltage?
Sorry... i looked at the time in the wrong direction 
Last log is 1220 in the above case. Similar in the other cases so I guess the problem is that I have installed to many panels. This is really really bad by Growatt not to be able to control the max current fast enough. This should not be an issue at all in modern power electroncs.
I guess the problem is that when the sun appears the potential energy increases fast and the growatt MPPT Control is much slower than this.
Last log is 1220 in the above case. Similar in the other cases so I guess the problem is that I have installed to many panels. This is really really bad by Growatt not to be able to control the max current fast enough. This should not be an issue at all in modern power electroncs.I guess the problem is that when the sun appears the potential energy increases fast and the growatt MPPT Control is much slower than this.
Texas-Mark
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I wonder if you are exceeding max PV open circuit voltage.
but my open circuit voltage is ~80V and growatt manage 105
But I wonder what happens when the sun starts to come ... the current increases at some unknown rate. When it reaches max the Growatt turns off and all the excess energy in cables will go to the DC bus cap. This might increse the voltage above the open circuit voltage for a short while.
But again Im expecting the growatt to have a over voltage protection for this scenareo?
and once again no error or warnings from the growatt...
Anyway I will turn of one sting before for the moment just in case.
But I wonder what happens when the sun starts to come ... the current increases at some unknown rate. When it reaches max the Growatt turns off and all the excess energy in cables will go to the DC bus cap. This might increse the voltage above the open circuit voltage for a short while.
But again Im expecting the growatt to have a over voltage protection for this scenareo?
and once again no error or warnings from the growatt...
Anyway I will turn of one sting before for the moment just in case.
Zwy
Solar Wizard
What is the third column, battery voltage/dc bus? Noted the log is where the more recent event is at the top. If the third column is battery voltage/dc bus, it drops to 14.7V, then up to 43.7V. This is a result of the controller attempting to supply the dc bus voltage when the voltage drops and switches the algorithm looking for max peak power point.
This could be the result of a load switching on drawing down battery/dc bus voltage. I would be checking wiring and connections first, using the various loads you have on the inverter and monitor battery and dc bus voltage. It could be internal to the unit such as a loose connection.
Zwy
Solar Wizard
"This could be the result of a load switching on drawing down battery/dc bus voltage. I would be checking wiring and connections first, using the various loads you have on the inverter and monitor battery and dc bus voltage. It could be internal to the unit such as a loose connection."
Today its the first 100% sunny day I disconnected two panels to be on the safe side, so 6 pices of 400W panels are active => 2400 peak power installed.
The peak so far (and I think im beond peak time) is 1.2kW, hence 50% of the installed power as I excpected.
So I wonder if it is safe or not to add the last two panels => 1.6kW.
No disconnect today
The peak so far (and I think im beond peak time) is 1.2kW, hence 50% of the installed power as I excpected.
So I wonder if it is safe or not to add the last two panels => 1.6kW.
No disconnect today
Rednecktek
Solar Wizard
There's an indicator. If it stays stable through the next couple days I think you've found the culprit.
Now it happened again... Don know exactly when But the PV has been 0W the whole day.
Measured and the input voltage (as well as the input voltage reported on the display on the growatt) was 77V but 0 current.
Restarted the unit and it starts working again. No errors no warnings as usual so no idea why it behaves as it does.
The installed power is now 1.6kW and it has been cloudy all week.
On the same BMS a Victron battery charger is installed so that has worked all the time so there is no BMS problem involved.
The battery has been faaaar from fully charged so its just seams lika a bug...
Measured and the input voltage (as well as the input voltage reported on the display on the growatt) was 77V but 0 current.
Restarted the unit and it starts working again. No errors no warnings as usual so no idea why it behaves as it does.
The installed power is now 1.6kW and it has been cloudy all week.
On the same BMS a Victron battery charger is installed so that has worked all the time so there is no BMS problem involved.
The battery has been faaaar from fully charged so its just seams lika a bug...
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