Been studying a couple of days of MPPT output for the days we have had a reasonable amount of sun. I am observing something I cannot explain and that is when the output reaches a certain level 1.72kWh it flat lines at that level +/- .02kWh as if there was some restriction on output somewhere. Today it did it for about 6 hours so I did not get the normal solar output curve over the day. It did the same yesterday but for a shorter period as it was not as sunny. I have had a look to see if I have the latest firmware and at V1.27 I think I have but I did pick up some comment that for older (how old) batteries a different version is required. (V108?) The battery volt current chart is showing a similar shape to the MPPT output curve and wonder if they are linked.
The MPPT will restrict the battery charge current to 100A.
This will flat line the power output.
kWh is a measure of capacity not power.
You have not added any additional data that could allow for an informed opinion.
What size is the array?
What MPPT is this?
What battery is it, what is the SOC?
What are the loads?
An MPPT will only generate the power it is asked to provide c/o dvcc (assuming this is used) which is trying to balance charge and coverage of loads.
Any limits set on the chargers also apply.
Thank you
Yes I was quoting the figure on the VRM graph which is the hourly measure so it was more or less constant 1720 W for practically most of the time
MPPT 450/100 RS also have Multiplus 11 48/8000/110-100
6kW
BMZ ESS X 10kW 186Wh SOC 100%
[quote=“Nick, post:3, topic:55117, username:nickdb”]
What are the loads?
[/quote]There were no significant loads most generation going to grid
I think that that therein is the problem, settings somewhere not right and controlling the output.
Not sure about the DVCC I think that was set automtically.
(At moment have got another issue which will do separate post if I cant resolve, Set the car charging overnight and the battery has gone onto idle At 11.30 pm grid chrges battery and supplies loads until 5.30 amso do not know what happened there)
The Vicron system is new to me my previous inverter died co gone bust, victron was only known make that was compatible with BMZ. Did not want to scrap battery.
1st thing solar was charging battery and sending a bit to grid or being used, Once battery was 100% the solar output was going to grid but stopping at ca 1720 W even though sun was getting stronger. So what is stopping the excess what do I need to set?
What grid code do you have configured? Some restrict output.
Are you limiting charge in DVCC at all?
Any grid current limits?
Thanks bigdadbob
I think you have hit nail on head as my battery has gone on idle because of something else and with that being out of the equation the output now this early on is 3200W where I would expect it to be. So what do settings need to be.
Thank you
G99
It is unset. I did not set the DVCC they selfpopoulated from somewhere (ESS Assistant?)
5000W DNO approved
You can try a test with grid code set to other and see if it changes.
Thanks
That is the Uk code if I try another code then I will be locked out, then I will need a special password to set it back. With the battery currently out of the equation the solar output is racing ahead (3800W currently) so the problem is associated with the settings and battery.