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From observation I'm in agreement with you both. What triggered the debate was the behaviour at SOC 100% as noted in post 45 above. (Nice sunny day and plenty of PV) Once it hits 100% Battery charge begins to drop but the available data "suggests" that its NOT going to load. However the PV is...

Ah. A missing piece of information. Thanks binky. Goes some way to explaining a little of the battery drain, though I think there's a tad more going on here than spec sheet would lead one to believe. Much will obviously have to do with the Growatts algorithms which sadly seem to be vailed in...

Time for an update. As noted in a separate post, inverter and battery enclosures have now been fitted with grounding straps. The generation meter has also been swapped over for a ECA2.nz (my purchase). See initial posts if interested. All completed by my installer and changes documented. (y)...

Just to draw a line under this one. Installer has returned and fitted earth straps to the inverter and battery enclosures. Response from Growatt regarding the battery was "its doubly insulated" ( something I'd picked up on in some other discussion on the web) so even though its class 1 the...

Hi Sounds like we have an identical system as I'm also a Solar Together recipient in Cheshire. May want to exchange experiences at some point... :) There are other contributors on here who have similar kit and will probably wade in however the first thing to note is that the shine phone app is...

My system has a Growatt SPH hybrid inverter and Growatt Li battery. Both units have earthing points on their enclosure and both are classified as class 1 protection. These are called out in the Growatt documentation which states should be fitted with 10mm2 earth cable. My installer hasn't...

Thanks again John. Have to hold my hand up to wanting to fit your data to my observations without thinking it through before engaging fingers to keyboard. Blindingly obvious point to make is that even if the structure at the SOC minimum is the BMS doing some degree of battery protection, during...

Have had to wait a while for a decent PV day in order to get an SOC plot with a 100% charge just to compare with that from John in post 40 above. Although this doesn't have an overnight charge event, yesterdays charge was sufficient to carry over to the early hours, it does illustrate that on...

That's interesting and maybe worrying. This is a typical SOC plot for my system. The first overnight charge started at 00:20 and stopped 01:20. It then discharges back to the 12% level and then you can see it slowly looses charge until 05:55 when the cycle is triggered all over again...

John It depends on where in the system this is wired in. Do you have the schematic for your system? In most installations this meter sits between the inverter and the junction block where the PV system feeds into the supply between the utility meter and the consumer unit. In which case if it was...

Well shouldn't be surprised but flipping those parameters to "disabled" made no difference. Worryingly it also feels like the time between events is actually getting shorter. Overnight I recorded 3 hours and 4 hours between grid charge episodes suggesting the loss of charge from 12% through...

Hi John The generation meter you have fitted is the ECA2.z This meter only reads one value. The ECA2.nz variant (Net) of this meter will read import and export and give a "NET" value. i.e. export - Import. Do you have a battery in the system? If so the .nz would register the output from the PV+...

Funny that. It's the only thing that I could see as well. I've flipped them to disabled and will see what we get overnight. Not too hopeful as I'm starting to think the charge loss may be the bigger issue.

Okay John settings as requested.

OK Adjustment of the Discharge Stop SOC setting hasn't worked in quite the way I'd hoped but has provided a bit more of an insight into what's going on. Yesterdays adjustment was simply to increase the Discharge Stop SOC from 10% to 12%. The hope was that the SOC limit, which triggers force...

Just to wade in on the debate. A similar technology behind what's now number spoofing was incorporated into digital, as opposed to analogue, switchboards which enabled company's to allocate specific numbers for various departments and "hide" the direct line numbers, extensions, from the...

Thanks again John. I've accessed the portal and made a change to the Discharge Stop SOC. I'll give it some time and report back when I have some more data. I've got an idea of what's happening but need to see what happens with the change first.

Thanks for the reply John and sticking with me through this. What are you using to access these settings? The ShinePhone app only seems to give a limited subset, via the plant control tab, of what you're showing above and I haven't found an "advanced settings" option that might open up more...

So @johnb2713 from above comments you are saying the hard deck for your Growatt is 10% and that's set by the BMS. Are parameters for the BMS accessible anywhere? Looking in the control panel from the Shinephone app I don't see anything that seems to relate. I've gone back to check the detailed...

Hi both. Thanks for the additional comments. I was in the process of trying to get some more data on the issue but will give you what I have to date. Firstly @johnb2713 The first thing I did once network connection was established was to check the AC charge setting and it is OFF as you...