I have a new Sunsynk 8kw inverter, my issue is the voltage the unit outputs exceeds 260v and switches off for 60s and does this over and over, this only happens when there is solar Panels are switched on, for example if I put 3kw of solar into the unit the output voltage is 250v, if I increase to 4kw, the out put voltage goes above 260v and shuts down, I have a goodwe inverter as well and i have tried it on the same phase with the same panels and it is perfect. Any Ideas ? 

Are you connecting the panels to only one MPPT? Keith Gough in a training video suggested that MPPTs should be balanced.

MPPT are perfectly balanced at 8 panel's each. 

19 hours ago, Dean said:

for example if I put 3kw of solar into the unit the output voltage is 250v, if I increase to 4kw, the out put voltage goes above 260v and shuts down

That sounds like you have a high resistance connection to the grid. You may have to get Eskom to check your fuse, cabling, etc.

If you don't export power, do you get voltage sag when you turn on a moderate load, like a kettle?

On 2022/01/13 at 7:32 PM, Dean said:

I have a new Sunsynk 8kw inverter, my issue is the voltage the unit outputs exceeds 260v and switches off for 60s and does this over and over, this only happens when there is solar Panels are switched on, for example if I put 3kw of solar into the unit the output voltage is 250v, if I increase to 4kw, the out put voltage goes above 260v and shuts down, I have a goodwe inverter as well and i have tried it on the same phase with the same panels and it is perfect. Any Ideas ? 

This is a supply side issue. According to our grid code the supply should not exceed 253V. What happens here is your supply is already at the upper limit. Then once the inverter starts generating, it lifts the voltage over the limit. This most likely also indicates that your impedance to the grid is not low enough. The inverter should not be able to raise the voltage that much. This can be due to your supply, or installation. Sadly, a different inverter will not solve this issue*, as the problem is with your supply or installation, and any inverter that complies to NRS097 will disconnect and indicate a fault under these circumstances.

*unless you choose  a different grid code, in which case it is not NRS097 compliant anymore and should not be able to get a CoC.

Edited February 1, 20223 yr by P1000