I've read the threads on this issue but unable to find a definitive answer.

Growatt SPF 5000 TL HVM / 2 x Dyness 5.12Kwh with BMS.

The Growatt inverter cuts the PV input at 100% SOC. Then it discharges the battery to 95% SOC before allowing charging again.

The problem is that between 100 and 95% SOC, the loads run off battery even if PV is available -  thereby cycling the battery unnecessarily.

So the definitive answer that I'm hoping for is, is there a software patch for this, or is this horrendous design flaw baked into the hardware?

10 minutes ago, AlexV said:

I've read the threads on this issue but unable to find a definitive answer.

Growatt SPF 5000 TL HVM / 2 x Dyness 5.12Kwh with BMS.

The Growatt inverter cuts the PV input at 100% SOC. Then it discharges the battery to 95% SOC before allowing charging again.

The problem is that between 100 and 95% SOC, the loads run off battery even if PV is available -  thereby cycling the battery unnecessarily.

So the definitive answer that I'm hoping for is, is there a software patch for this, or is this horrendous design flaw baked into the hardware?

May be I miss the boat here but it is very normal. 

1st you ensure that balancing between cells take place. If unbalanced then the BMS will cut charging when the highest cell reaches the upper limit. All other cells can still be lower. This affects the capacity of the battery. The same will happen during discharge when the weakest cell drop faster than the other. 

If the battery just sits at 100% and not discharged. Say no LS and the inverter is used as a UPS you will shave off a lot on the life of the battery as sitting at 100% is not good for a lithium. The rest of the world could have power most of the time. Country specific. 

Just the way I see it. 

It's an off-grid system.

I would only want it to sit at 100% while the sun is shining and the loads are being powered by the excess solar, instead of by the battery.

When the sun goes down, the battery powers the loads, so the battery discharges anyway.

Surely this would be preferable to discharging the battery unnecessarily and wasting perfectly good solar power in the process?

Something to do with a Growatt algorithm and is normal, issue has been a bugbear for Growatt owners for ages. 

Thanks for the replies!

Surely Growatt has picked up on this discontent.

If it's to do with the charging algorithm, as opposed to the way the hardware is put together, it should be fixable with a software patch.

Has anyone out there asked Growatt directly?

So after much ado, and much timewasting with local Growatt support, I'm in touch with the techies in China. What I'm asking for is a firmware patch. Will keep y'all posted.

 

22 minutes ago, AlexV said:

So after much ado, and much timewasting with local Growatt support, I'm in touch with the techies in China. What I'm asking for is a firmware patch. Will keep y'all posted.

 

Good luck.
I have tried that too. They maintain their algorithm ensures that it's better for the batteries to discharge to 95% before recharging to 100% instead of a permanent float at 100%. What it basically does even if there is enough sun, at that 100% trigger it powers the Inverter only from the battery
Which version of Inverter/Firmware do you have. They would have to do Firmwares for all three editions that are in the market currently.
I wouldn't hold my breath

So Growatt tech support have said that a firmware upgrade will solve the problem, and that if I return the unit to the supplier, they will do the upgrade at their repair centre under the warranty.

Quite impressed with the after-sales, will let you all know if it worked!

Hello,
did you solve this problem? I'm experiencing the same scenario.

It charges to 100% then slowly (in 3-4 hours) it drops to 95% SOC even when there is enough solar.

I have 2 battery packs 100ah 48v .