I'm relatively green when it comes to these topics, but I have a Deye inverter with a Revov battery. I've noticed on Solar Assistant that when Solar is generating well, grid usage is 0, but when the Solar is very up and down, it switches to grid momentarily before switching to the battery. Does anyone know why this is? I would have assumed that PV would be supplemented immediately from the battery, and if the thresholds are breached to then use the grid.

In this graph, battery is at 100% charged, but when PV drops below the demand, it switches initially to grid, and then swops to battery.

48 minutes ago, DonM said:

I'm relatively green when it comes to these topics, but I have a Deye inverter with a Revov battery. I've noticed on Solar Assistant that when Solar is generating well, grid usage is 0, but when the Solar is very up and down, it switches to grid momentarily before switching to the battery. Does anyone know why this is? I would have assumed that PV would be supplemented immediately from the battery, and if the thresholds are breached to then use the grid.

In this graph, battery is at 100% charged, but when PV drops below the demand, it switches initially to grid, and then swops to battery.

Send us a pic of the timer settings page.

Also the system work mode where you set the zero export to CT / solar sell etc.

5 minutes ago, Scorp007 said:

Send us a pic of the timer settings page.

Also the system work mode where you set the zero export to CT / solar sell etc.

Here are the configs:

And then the Work Mode timers:

Basically I want the system to use the battery between 9:00 - 16:15. Otherwise it should use Grid to supplement the load (I have my parent's living in a flat at the back who is on the non-essentials, but they not particularly energy conscious, so they would just run the battery down in an hour or two. Currently I run off battery between 1am and 4am, and then it switches back to grid.

If the battery is below 25% between 1pm and 4pm, it should charge it up from the grid (Just to cover load shedding if it hits unexpectedly and solar hasn't managed to charge the battery up yet).

Hopefully that all makes sense.

So this is a good example for me, this was before the 'Grid' option is ticked, but grid is 264W, and the battery is sitting on 100%, I would expect PV to be 656, Battery to be 264 instead of using the grid... I would expect the grid supply to be pretty flat like the early part of the morning (Where PV is generating well)

1 hour ago, DonM said:

Here are the configs:

And then the Work Mode timers:

Basically I want the system to use the battery between 9:00 - 16:15. Otherwise it should use Grid to supplement the load (I have my parent's living in a flat at the back who is on the non-essentials, but they not particularly energy conscious, so they would just run the battery down in an hour or two. Currently I run off battery between 1am and 4am, and then it switches back to grid.

If the battery is below 25% between 1pm and 4pm, it should charge it up from the grid (Just to cover load shedding if it hits unexpectedly and solar hasn't managed to charge the battery up yet).

Hopefully that all makes sense.

All looks fine with the settings. It is set to use the battery and not grid in the time you want to use battery.

1 hour ago, DonM said:

So this is a good example for me, this was before the 'Grid' option is ticked, but grid is 264W, and the battery is sitting on 100%, I would expect PV to be 656, Battery to be 264 instead of using the grid... I would expect the grid supply to be pretty flat like the early part of the morning (Where PV is generating well)

You are spot on. If the grid is not ticked in timer for the time after 12h30 and battery SOC is high it should not use grid but battery instead just like the period before 12h30.

2 minutes ago, Scorp007 said:

You are spot on. If the grid is not ticked in timer for the time after 12h30 and battery SOC is high it should not use grid but battery instead just like the period before 12h30.

Yeah, that's what I don't get, and it's only when the PV isn't quite generating enough it seems to switch between grid and battery often. When there is enough PV to supply the load AND charge battery, then Grid is flat. There seems to be something switching from PV to Battery...almost like a preference is to Grid first.

3 hours ago, DonM said:

In this graph, battery is at 100% charged, but when PV drops below the demand, it switches initially to grid, and then swops to battery.

My Goodwe sometimes does this. My assumption is that there's a short delay if the battery has to suddenly start supplying. Or the inverter ramps up the demand from the battery over a short but measurable period of time.

Might be to do with the BMS, might be to do with the firmware on the inverter.

2 minutes ago, Bobster. said:

My Goodwe sometimes does this. My assumption is that there's a short delay if the battery has to suddenly start supplying. Or the inverter ramps up the demand from the battery over a short but measurable period of time.

Might be to do with the BMS, might be to do with the firmware on the inverter.

I have thought the same thing - the initial demand kicks in and the inverter takes from the grid until the battery sort of realises it can supply. It isn't much, probably about 1 unit a day, if that. I was just wondering if it's a setting that I have missed, or sort of by design. Seems it could be by design, although it doesn't always make sense.

Thanks for all the input

I would try a firmware update and see if it changes anything

1 minute ago, abd7 said:

I would try a firmware update and see if it changes anything

I'm always terrified that doing this will break something / brick the battery etc.