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Deye 8kw - weird issue when generator is running


Zkrige
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My inverter gets supply from grid. I have 23kva generator inline. when grid goes down, generator kicks in and supplies to the house. this feed comes in to the inverter.

When the grid is supplying, the inverter works fine. When the grid goes down (praise Cyril) and my generator kicks in, the inverter refuses to pick up the "grid". It just shows "stand by", "0hz" as per photo. You'll also notice the AC light is on, so it does in fact see the incoming current. I've put a multimeter across the incoming "grid" connection lugs while generator is running and it picks up 232v (2nd photo)

When the grid power comes back, then it goes back to normal

Im completely confused. As far as the inverter is concerned, it shouldnt be able to tell the difference between generator supplied power and grid supplied power - they both come in on the same line

Any ideas on what I need to do here?

IMG_5999.jpeg

IMG_5995.jpg

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The inverter is seeing 229 volts and the meter 232, so it looks like this is what the genny is providing.

I am not familiar with the Deye's interface, but I do know that the Sunsynk does have a screen defining the grid settings, things like upper and lower voltage ranges, and frequency high and low. It is possible that these ranges may be incorrectly set on your inverter.  Could you find this setting screen and show it? On my Sunsynk low is defined as 185V and high as 265V with frequency high of 51.5Hz and low of 47.5Hz.      

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The second screen looks OK to me, seems to be sufficient latitude. I don't know or understand anything about the subsequent ones though, but it seems that they are not in use, so best not to fiddle there.

Is there a way that you can measure the genny's output frequency?

Another alternative is to hook the genny onto the Aux port (I assume that it's currently feeding from the grid side via a changeover switch).

Edited by YellowTapemeasure
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I dont have any means to measure the genny output freq, but I assume its "ok" as the house seems to run just fine. The genny has an auto start and auto changeover switch. Yes, it feeds from grid side.

Also, if I disconnect the batteries and pv on the inverter while the genny is running, the inverter stays powered up, so its definitely getting power from the genny. Also as per the original screenshot the "AC" led is on when the genny is running.

I'm going to try get hold of a multimeter that can read frequency and see if that narrows it down

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4 minutes ago, JustinSchoeman said:

Almost certainly frequency related. Try bump Grid Hz high to max and Grid Hz Low to min, and see if it helps.

Or fiddle with the genny's speed settings and see if it makes any difference?

Edit : another thing that I thought of: is the genny correctly earthed?

Edited by YellowTapemeasure
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