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No "Eskom" Power at times after solar installation


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I have a 15KW system (2 Parallel 7.5 Kodak Inverters) with 4x Plyontech batteries (10KW in total).

This has been an upgrade from a previous 3KW inverter with a seperate MPPT charger.  Did the upgrade as it couldn't handle pool pump, pool heat pump etc.

The previous system didn't have a change over DB, so the upgrade was a complete overhaul, and am very happy with it. 

However since the upgrade, every day around the same time (between 12h00 and 14h00)  the system seems to disconnect the grid. i.e. No Eskom available.  The pre-paid meter is still on, as in the picture below.  The oven is not connected to the solar hence everytime "Eskom switches off" the oven goes off.  The disconnect lasts for a minute at most. No breakers tripping.

You can hear a slight dip in the pool pump when this switch happen.

Have gone for a day with running minimum load to isolate the problem but still happened on a 3% load (basically just fridges, tv). 

I am not at home during the day so can't really check if there are any errors on the inverter, but will try and hook it up to WatchPower tonight to see if there are any logs.

Taking a long shot, any ideas what this could be?  I have contacted the installer but he hasn't gotten back to me yet.

 

ac isolator.PNG

IMG-1486.jpg

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On 2021/02/12 at 10:19 PM, Bobster said:

My guess would be that the grid voltage is dropping and goes below some parameter in the inverter and so the inverter disconnects. 

Is it possible that it disconnects the grid because the voltage is too high? Only happens between 12-3pm every day. 
See below from WatchPower app, the grid voltage is 0 when it happens.

 

1778015631_inverter-0voltage.PNG.09b29577af3d6751d68bfb8f47965b52.PNG

 

 

Edited by divanvanderwatt
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2 hours ago, divanvanderwatt said:

Is it possible that it disconnects the grid because the voltage is too high? Only happens between 12-3pm every day. 
See below from WatchPower app, the grid voltage is 0 when it happens.

I don't have the same inverter as yours (nor the problem of an over voltage) so I can't comment on the image you shared. On the Goodwe I can always see the incoming voltage if there is one.

If Grid shows zero volts then the grid is down (or my connection severed).

If Grid and inverter output are the same then the grid voltage is within the limits the inverter imposes and the inverter output has synchronised with the grid.

But sometimes I will see something like Grid 195 V, inverter output 230 V and that's the inverter saying that yes, there IS a grid, but I'm not going to have anything to do with it.

I assume there must be an upper bound too, but that's not a problem I have to deal with where I live.
 

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17 hours ago, divanvanderwatt said:

I switched off my heatpump’s  (for geyser) breaker, and no 0 voltage and grid stayed connected

Huh. If that's consistent (not just a coincidence), it suggests some sort of neutral wiring fault to me, or (even wilder guess) an earthing issue.

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