Revov and my puzzle

I've mentioned this before. I get a puzzling situation on my system where reported SOC makes a sudden jump. This happened today

Now this has been worrying me. It's happened quote a lot lately. The jump always happens when
1) SOC drops to 40% or lower
2) When reported SOC rises back to 70ish %.

So what do I believe? The 70 or the 100? 

I mailed Revov. They sent somebody out to test the batteries. This pleased me - I have some support. 

The technician checked ONLY the batteries. This seemed fair to me. The rest of the system is not theirs.

Some points that emerged from this
1) The Revovs are "1C" batteries. As I understand it, this means they can be charged quickly, and they supply quite a hefty current on discharge.

2) The charge current on my system is set to 90.23 amps. Which (tech says) is high but OK for the batteries I have.

3) The tech interrogated the Revov BMS to check the condition of each cell in the battery pack and to look for error logs. This test gives the battery pack a clean bill of health. He says I should believe the 100

4) He also hypothesised that if the charge current was reduced then the sudden jump would be less sudden.

5) Between the BMS and the Inverter there is another box, added by my installer to stabilise the system. This is not made nor supplied by Revov. So what the portal is getting is the output from that box. This seems to me to be a major problem with these systems, because no company makes entire systems. You always get batteries from one company, panels from a second, batteries from a third. In my case a BMU from a 4th. So the challenge is to get all the bits working together harmoniously, and quite naturally the various manufacturers will only offer support and be concerned about their part of the system. In this case it didn't lead to fingerpointing, but I can see how it could have.

6) He tells me business is very good right now. Lots of people are installing solar at home or at business.

But nice that they sent somebody out to run some diagnostics on a 2 year old battery pack.

Edited October 14, 20214 yr by Bobster