AlexV

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!

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.

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?

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?

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?

It will also not apply to scenarios where residents completely sever their homes from the grid. The city’s regulations apply only where there is a connection to the electricity network. It will also not apply to scenarios where residents completely sever their homes from the grid. Does a mechanism exist to voluntarily disconnect from the COCT grid and what is it? The city’s regulations apply only where there is a connection to the electricity network. If you do not have a grid connection, your installation is by definition, off-grid - in this case, do you still need to get approval from COCT, and must your inverter still be on the COCT list, and what about approval for the panels? Thanks!