Confusion about figures in app

[Fwarwick]

Hi new to panels and batteries I wanted to ask about the app as I have found that the figures don't add up.

I am trying to take as little from the grid as possible so all configured around self use however yesterday according to the app I generated 4.7kwh and load consumption was 9.1kwh with supposedly 9.5kwh coming from the grid. It says I was 100% self use so shouldn't the 4.7kwh generated and 'self used' mean that I only consumed the difference from the grid.? This has shown twice now and I am worried there is a problem with the install.

[MaterialBarracuda48]

Odds are your CT clamp is reversed, so it is taking readings wrong.
Do you have the power graphs in the same section (below) to show the power distribution?
Do you have a screenshot of your home screen in the App?

[daveg]

Is this only seen on days when 'From grid' exceeds 'Load consumption '?
I see that as well, but have always just blithely assured that it was an artefact of the app. I can see from the power graphs that load is being met by both PV and battery discharge once forced charge period ends.

[MaterialBarracuda48]

@Daveg The one thing that seems to stick out is the battery supplied 0kWh during both days, you would think some would be used during the night.

Anyhow, a few graphs should show us where the power is coming and going from.
It's a Scooby do mystery so far

[daveg]

Here are my figures for today so far.

You can see from the graphs that load has been met by both PV and battery since 7am, yet from PV and Battery shows as 0 on self suffiency summary.

(Edit isn't it just telling me that I didn't achieve any self suffiency so far today because I bought in more than I used?)

Perhaps I'm missing something in OP's post.

[MaterialBarracuda48]

Here are my figures for today so far.

You can see from the graphs that load has been met by both PV and battery since 7am, yet from PV and Battery shows as 0 on self suffiency summary.

Perhaps I'm missing something in OP's post.

Hi Dave,

You may not be missing anything at all, perhaps OP charges during the night, which was not clear to me on their post?
I don't currently charge overnight, so mine does report power has been taken from the battery overnight.

You are correct that the value would be 0kWh if they are charging from the grid, the system will show the same when I utilise the "Free" power that Octopus have been giving on Sundays for saver sessions (and the "To Grid" higher than "PV Production" message)

Once OP posts back, then we will know if the CT clamp was a red herring from me.

[daveg]

Yes, the OP power graphs will be interesting.
I'd not really thought about this before, but the app reporting of self suffiency, implying that PV and battery have supplied nothing to meet load until load exceeds import does seem very discouraging!

[Fwarwick]

Hi I have octopus flux and force charge the battery between 2-5 am to top it up and during the daytime I use solar then battery with excess solar topping up battery throughout the day. Mainly set to self use unless I have full battery and produce more than needed. Looking at my usage graph on the octopus website it says I used 0.108kw from the grid yesterday. I am so confused.

[daveg]

You can't believe anything about consumption on the Octopus site for at least two days.

[MaterialBarracuda48]

In this picture, here is and example from Sunday where Octopus gave me free electric.
Note that the 'stored' free electric in the battery means that the 'From PV & Battery' value is 0kWh even though battery was used later in the evening. So this means it calculated the 'stored' power from the grid, such that it does not count.

Here is a normal day, note that it is counting this time the energy 'stored' in the battery on the figures.

So it would seem, if you are charging a lot during the night, then it won't count the power 'stored' as if it came from your PV input.

[Fwarwick]

Here are the graphs for both dates I took pics of previously. The spike around 6:30am was my electric shower which is power hungry.

[daveg]

The grid charges the batteries overnight, then in the morning the large shower load is met by a combination of battery discharge and grid, and then during the day the load is met by the sun, with surplus charging batteries, then in the evening the load is met by the batteries. I don't see anything unusual.
I don't see any export to grid, so presumably during the day the batteries didn't reach the max SoC you've got set? We can't see the SoC profile.

[Fwarwick]

I am going for mainly self use rather than selling to the grid at the moment soc is 100%.