Pylontech SOC jump while charging

[viceroy]

This normal on the Pylontechs?

Similar would happen with my 200Ah Omnipowers, but would happen around 95% SOC, and then jump to 100%

This is happening around 89% on my Pylontechs. No change in SOC, and then instant jump to 100%.

SOC is being read by ICC.

[SYC]

Yes its normal

[viceroy]

Thanks for the responses guys.

[___]

As the others have said, it is normal. SOC is always a numerical estimation of a physical system, and there is always a bit of drift. It is normal for the SOC to be off by some margin, and for a "reset" to cause a jump at the top. The one thing we know for sure about batteries is that 1) the voltage rises and 2) the current drops when they are full, so most battery monitors will look for that event, and then reset, which corrects any drift there might have been since the last time the battery was full. These jumps will be smaller if the battery is regularly charged fully.

[JacquesVDM]

Normal.. I have two separate systems and both remain at 89% for about 30 minutes and then "jumps"  to 100% after a few minutes.

[Bernardf]

I have a new system with a Sunsynk 5kW inverter and 2x Dyness 3.6kWh Lithium batteries.  I have also noticed this jump from about 85% to 100% with each charge, and was concerned that it might be due to incorrect settings on my inverter.  But from this discussion it seems like it is just the way these systems work, and not specific to a certain brand of battery.

[___]

28 minutes ago, Bernardf said:

I have a new system with a Sunsynk 5kW inverter and 2x Dyness 3.6kWh Lithium batteries.  I have also noticed this jump from about 85% to 100% with each charge, and was concerned that it might be due to incorrect settings on my inverter.  But from this discussion it seems like it is just the way these systems work, and not specific to a certain brand of battery.

Especially when new, there will be a large jump, but the jump should get smaller every day until it is practically non-existent (except maybe a small 2-3% jump at the top). If it does not get better after two weeks or so, then perhaps talk to the battery supplier.

[Bernardf]

On 2020/05/15 at 12:06 PM, plonkster said:

Especially when new, there will be a large jump, but the jump should get smaller every day until it is practically non-existent (except maybe a small 2-3% jump at the top). If it does not get better after two weeks or so, then perhaps talk to the battery supplier.

Thanks for the info.  You're right, the jump is getting smaller.  It now goes from about 91% to 100%, about 2 weeks after installation.