Grid Pressure/Push back Setting added to the K and H1-gen2

[Will]

Today I've been testing the new grid meter compensation setting which allows you to set the inverter to always push back a tiny bit instead of drawing from the grid.

[Scott]

Thanks for the update Will.

I've had my system for less than a week and one of the first things I noticed was the constant grid usage of a tiny amount. This sounds great to solve that but I'm curious as to the technical reason why this happens? And why is pushing back to the grid a solution for it?

Cheers
Scott

[Dave Foster]

This sounds great to solve that but I'm curious as to the technical reason why this happens? And why is pushing back to the grid a solution for it?

Cheers
Scott

The inverter is grid tied which means it has to syncronise to the grid and match the load power it measures on its meter/ct - it maintains a very small bias (current flow) from the grid (in self-use) and towards the grid (in feed-in) to maintain it’s syncronisation so that it can detect grid loss quickly and disconnect (by regulations).
I had a go at a more technical answer in this post if you are interested https://foxesscommunity.com/viewtopic.php?p=4135#p4135

[Scott]

Hi Dave,

Thanks for the reply.

I had a read of the more technical description you wrote, while some of it was beyond me its given me a better understanding of how it works.

I'm pretty new to solar, and I'm not particularly cluded up on electricity in general so it's great to be able to learn how it actually works.

[Dave Foster]

Hi Dave,

Thanks for the reply.

I had a read of the more technical description you wrote, while some of it was beyond me its given me a better understanding of how it works.

I'm pretty new to solar, and I'm not particularly cluded up on electricity in general so it's great to be able to learn how it actually works.

Hi no problem, and welcome to the world of solar.

You’ll be pleased to know I don’t often go that technical but the question of the slight power usage comes up regularly and in that case they were looking for a descriptive answer. This feature whilst quite small is quite a significant one for those of us that are trying to eliminate any power usage from grid

[reef]

Is there any chance this will be made possible on the H1 gen 1 in the future? It always uses about 0.3kWh per day at the peak rate so it would save about £30 per year alone.

[alistair.miller]

Here is hoping this new setting comes to the H1 gen 1 inverter. Particularly for the winter months as this small draw from grid often adds up to 300watts a day which over time really adds up. I manually set mine to feed in over night which helps reduce this but it's a bit of a pain to remember to do.

[AndyMillne]

Is this update available for the KH10.5 and in the user settings? I would really like to get this enabled as the draw, although small, is annoying when trying to eliminate grid usage wherever possible. If I was to ask for the firmware update from Fox, presumably I'll still need to get the installer to alter the setting as I don't have agent access.

[UK_KH_User123]

Today I got the latest updates from FoxESS on my KH10.5 and asked my installer to give me -20 watts. He knew what I asking for, and did it, but it has not made any difference (I have modbus, so can see grid use updated very frequently and I would notice 20 watts at the grid CT for sure). I also cannot find any reference to this setting after digging through the menu system on the inverter itself. Should I try a reboot? Any thoughts for me? Thanks.

[Dave Foster]

Today I got the latest updates from FoxESS on my KH10.5 and asked my installer to give me -20 watts. He knew what I asking for, and did it, but it has not made any difference (I have modbus, so can see grid use updated very frequently and I would notice 20 watts at the grid CT for sure). I also cannot find any reference to this setting after digging through the menu system on the inverter itself. Should I try a reboot? Any thoughts for me? Thanks.

It’s not available through the inverter menu’s, only an installer level account can access this remotely.

I’m not familiar with this functionality but I know others have started with a setting of -50 watts and worked from there.

[UK_KH_User123]

Strange .. not working for me. I had my installer change it to -50 and I still see it behaving just like it always did (typically pulling about 10 watt from the grid).

Master : 1.41
Slave : 1.01
Manager : 1.37

KH10.5

[AndyMillne]

I've had the firmware updated and asked the installer to update the setting but it sounds like they need to get in touch with FoxESS for some reason. I'll keep you posted with how we get on. They're doing a site visit to install some additional slave batteries too.

[UK_KH_User123]

Argh! I think I have found my issue perhaps. I was expecing to see a change in the Modbus entity sensor.foxess_grid_ct and there was no change. But actually, we are trying to 'calibrate' that sensor so that it is more accurate -- or we are trying to fool it into pushing back to the grid (that's what I'm trying to do and what Will was suggesting in his video).

I don't have an in-home display for my smart meter and don't have the special Octopus box that Will has so I can't see it. When my export figures appear for today on the Octopus usage history I can confirm if it's working or not.

[UK_KH_User123]

I think it's working!

[Phil M]

This looks really interesting and I'd like to change my setting but don't have installer access via Foxcloud. It is possible through the inverter screen interface and if so, could somebody point me in the right direction of which options to change? I had a look but it wasn't obvious to me and i didn't want to screw anything else up.

Thanks,

Phil

[Dave Foster]

It is possible through the inverter screen interface and if so, could somebody point me in the right direction of which options to change? I had a look but it wasn't obvious to me and i didn't want to screw anything else up.

Thanks,

Phil

Sadly not, ask your installer (or Fox if unavailable) and they will change the setting remotely.