Growatt battery discharging too early - Octopus Flux setup help

omossinnit

Growatt SPH6000 + 5kWh battery on Octopus Flux - why is battery discharging at 14:00 instead of waiting for my Grid First schedule (16:00-19:00)?

Setup:

• Active mode: Load First
• Grid First Time Period 1: 16:00-19:00 (enabled)
• AC Charge: 02:00-05:00 (working fine - see orange bars in graph)

Problem: Blue bars show heavy discharge starting 14:00, then battery empty by peak hours when I actually need it (cooking dinner 17:00). Having to import expensive peak rate power (brown bars 17:00-19:00).

Question: How do I stop battery discharging before 16:00? Should I switch from Load First to Battery First mode? Is there a "preserve battery until X time" setting I'm missing

QrizB

I don't know the ins and outs of Growatt's hybrid software.

With my Sofar, I've set it to grid charge overnight then to service loads from the battery for the rest of the day. I never force a discharge.

But then I'm on IOG not OF.

Marksfish

I don't use my Growatt for that sort of discharge pattern, but the image looks like a screenshot from ShinePhone. the website at https://server.growatt.com/ is a bit more user friendly and may help you achieve what you want to do better/ easier. 

omossinnit

UPDATE - SOLUTION FOUND

Thanks for the responses. After digging through Growatt documentation and forums, I found the issue.

The Problem: Load First mode (the system default) was discharging the battery whenever household demand exceeded solar generation - regardless of time. By the time the Grid First schedule (16:00-19:00) activated to use battery for peak period, it was already depleted.

The Solution: Changed Load First "Discharge Stopped SOC" from 10% to 90%

This tells the system: "Don't discharge battery during the day unless it drops below 90%"

The Grid First schedule (16:00-19:00) overrides this restriction, so battery still discharges during peak hours as intended.

In practice:

• Battery charges overnight to 100% (02:00-05:00) ✅
• During day, Load First sees battery >90% and WON'T discharge it (preserves charge)
• House uses solar or standard-rate grid during day
• At 16:00 Grid First forces discharge regardless of SOC
• Battery available for expensive peak period (16:00-19:00) ✅

Will report back in a few days to confirm if this resolves the early discharge issue.

ascending_8

@omossinnit

I have been having the same issue, do you have any update. Did your plan work?

I have just followedyour configuration myself.
Hopefully your plan worked and it will for me too.

tamste

You say you are on Flux, but I can't see Growatt as an accepted battery manufacturer.

Just wanting to check as I am looking at adding Growatt batteries to my Growatt hybrid inverter, but thought Flux etc. was outside what I could use on these tariffs as they ask for specific battery manufacturers in the signup process, and I can't see Growatt listed.

Alnat1

https://forums.moneysavingexpert.com/discussion/comment/81856154#Comment_81856154

There's the basic Flux tariff and the Intelligent Flux tariff. On the basic tariff you decide what your battery does. On the Intelligent Flux tariff it's decided by Octopus.