@RSMack You need to give us the following VRM graphs to realy be sure what is happening.
System PV yield
Battery SOC
Battery Charge/Discharge limits
You will see as my battery SOC reach 100% (blue) the PV (green) is being throttled(orange) to only supply power to what the system use at that time. Your system can only produce power power if there is something that can use that power (like the battery or appliances/lights)
This might not be the only issue though.
Temp is fine, it indicates 33 degrees
That is the battery temp, we donāt know the MPPTs temp - Donāt know if thereās a sensor for it.
I donāt think so and therefore the internal values for the MPPT in Console are useful. Especially now around middle of the day when the yield should be close to itās max.
@RSMack Can you go to Remote Console, Select 450/100 MPPT and send a screen grab of this screen pleaseā¦ If you can 
Just did
Thanks @RSMack - I think you are getting some temperature derating as both MPPTās are running in the same caseā¦
Suggestion: Put a fan pointing at the base of the MPPT - I do this with a small USB fan and it helps with the derating ā¦ If it doesnāt help then we look elsewhere for the issueā¦
Just saw this on the MPPT settngs. See current is set to 80A. Is that adequate with 4 x US3000C batteries connected? Each battery has a recommended charge current of 37A.
The BMS controls that. So you can go have a look at the batteryās charge current parameter (in the Pylontech Battery on the GX device, under parameters). My 3xUS3000s are giving me a charge current of 88.8A at the moment (89% SoC).
Iāll try a fan but I am pretty sure its not the issue as the garage is not that hot and the MPPT does not seem to be running hot either. It also has its own cooling fan on this MPPT, its a totally different enclosure to the 250/85
BMS is derating the charge rate.
Thanks @jykenmynie Another setting we rarely consider and adds to the complexity āvariablesā We always think of the obvious ā¦
Sorry my idea of a fan wonāt help as they batteries are the issueā¦
Doesnt look like the BMS is the issue either. Charge current set at 148A
But that shouldnāt then be a problem when the house loads high. Then the battery isnāt being charged/even discharged. At that point the MPPT should be able to ramp beyond, surely?
Exactly what I thought as well
Agree but I have noticed that the value for Battery isnāt actually battery but could also include āfeed back to gridā as wellā¦ so my batteries are full but Iām still limited by the BMS setting even when I want to feed back (for example - hypothetically!)
@plonkster - could this be a bug/issue where ESS/DVCC doesnāt distinguish between battery charging limit and other loadsā¦ ? I am guessing hereā¦
