Guthrum

@Michaelza Unfortunately that's is the issue I have with this brand of inverter. We replaced the inverter with a brand new one, same issue. Had a couple of solar expert come and try to sort out this issue to no success, they tried adding capacitors to my setup did not work. SynSynk/Deye was contacted with no solution. My only solution at this point was to switch off the grid during the day as well. If you find a solution please do share.

I noticed my cycle count is also doing 2 a day, I read somewhere on the forum that every manufacture calculates it differently. I speak under correction but with one of the support emails with Hubble they did mention that "Cycles are calculated when you drain your battery by 50% and charge it back up, this will be seen as a cycle." So I suppose two a day checks out then not super happy with it.

Just to add a bit of my experience here. My batteries were losing capacity like crazy. I ended up at 174Ah for three batteries according to Solar Assistant. Hubble support asked me to send the batteries in so they can troubleshoot, but I was reluctant to take the system apart and be without my batteries so procrastinated for 3 months. I was convinced it was firmware, as the cell voltages were all very close and didn't indicate bad cells.
Last week I saw Guthrum and werner.potgieter had success with with getting the firmware from Hubble, and they were kind enough to share with me. I have the RS232 cable as I run Solar Assistant and uploaded the firmware a week ago, and my capacity is now sitting at 315Ah (315 x 50 = 15.75kWh). Checking the logs and I can see that I get about 12.5kWh from my batteries each night at a DoD of 20%, so I am much happier with my setup now.
My remaining issue now is that the batteries' cycle count is still increasing too quickly. About 2 per day, where I definitely do not charge and discharge that much. I hope the cycle count is not used for warranty purposes as the batteries are burning through the cycles.

Not sure if SA can update it directly, but if you get the firmware from Hubble Support you can use the SA cable with a laptop to install it. Support provides an app to do the install that way. 
I don't have a Riot link but don't like the idea that I need internet access all the time. SA work offline and has great realtime stats.

Not sure if SA can update it directly, but if you get the firmware from Hubble Support you can use the SA cable with a laptop to install it. Support provides an app to do the install that way. 
I don't have a Riot link but don't like the idea that I need internet access all the time. SA work offline and has great realtime stats.

I've had my firmware updated and the the battery now refuses to go below 52% SOC.  This was the original issue, then it suddenly dropped to 0% and was erratic.  I basically have about 40% capacity in the battery after 7 months.
@HubbleLithiumPlease can you comment, as your batteries are failing left right and centre.
 

I used the solar-assistant Bull/Hubble AM RS232 to do the update seems to work no issues

@Guthrum, you mentioned that you are based in Cape Town, if you don't come right, maybe I could come out and help you.