Avenir Doesn't look like there's anything we'r edoing wrong on that occasion. It may simply be a side-effect of the charge rate adjustment and the way this works on Giv systems tbh.
Back in November, we didn't have charge rate adjustment in place I don't think.
Would be worth toggling 'Adjust charge rate' to Off and you probably won't see these wobbles.
inferior-opposite
I've found the same. The activity log says a hold is in place but the battery is still active. As it happens, the sun has unexpectedly come out so I'm happy that the hold didn't work as my battery is charging
Thinking out loud… the battery should be paused for the duration of the off-peak period when the charge is complete, but the charge is never completed because the target value is never met (in my case it's always 1% short). Could that be what's going on?
So there's several different things going on.
Hold charge is not being used on the regular charging schedules. I would expect the exact same behaviour you are seeing if you applied the charging parameters via the Giv app or portal, including adjusting charge rate.
For the Agile charge slots, where we apply the hold, we effectively set discharge power to 0.
For some Giv Hybrid inverters this does actually not work as you'd expect, as it can allow a few hundred watts through. More on that in this thread: https://community.wonderwatt.com/d/110-release-363-octopus-agile-window-hold-charge-functionality/51
I get the same result when charging at max rate. But it worked fine back in November.
I don't think the inverter is the problem, because we can see there was no SOC wobble issue up until mid December 2023. The last update to the BMS was on 2023-11-30, but I can see the battery was holding charge in off-peak just fine on 2023-12-08.
In Mid December the WW variable charge rate feature was introduced. The battery was no longer able to meet the target, typically 3–6% short. I worked around this by overstating the battery capacity by up to 15%. I can see the SOC wobble is evident on December 26, when it completed a charge early.
I will try and set a timed charge via the GE portal and see what happens.
@admin As you correctly predicted, I got the same SOC wobble when setting via the Giv portal 'Timed Charge' settings. The wobble is actually pretty large, draining the battery at the inverter's full rate of 2.6kw – so I think we can discount the possibility that it's the inverter 'leaking' a few hundred watts.
Looking back in the logs, back in November/December WW would send a command to 'Enable Eco Mode', which is no longer sent. Could it be that this command prevented the issue I am seeing?
Avenir Thanks for digging that out.
So back then we were using the presets, but they were causing too many Inverter Timeouts.
I don't think it's related to Eco-mode. It's more likely the Enable DC Discharge being set to False.
We may need to do this during charge windows, and possibly during on hold.
