Hello , I think I have some problems for configuring my installation . I switched on grid to let the batteries charge again because charging was a problem .
My installation :
MultiPlus-II 48/3000/35-32
SmartSolar Charger MPPT 150/60
Batteries 39x Nickel-Fer 300 Ah
BMV-712 Smart
GX color control
I think that my MPPT has a problem because for several months , I saw that it is charging at his entire capacity only if there is a high load . For example , with the batteries low , a beautiful sun at noon :
With a dishwasher 2200W consuming , it charges at maximum capacity : 2000W or 2800W …
Without high consuming , it charges at 900W 700W or less .
Is there a well-known reason of this kind of issue ?
I will be glad to solve it before winter .
You will need to provide some more information as you have unusual batteries. What absorption and float voltages do you have set on the MPPT, what are the actual voltages during MPPT charging, what voltage settings do you have the Multiplus. Some screenshots from VRM may be useful.
Do you have DVCC set up on the GX device to share the BMV712 voltage.
Have you checked that you do not have a high voltage drop between your MPPT and batteries with a multimeter.
1 Like
NI-Fe absoption-bulk : 1.65X39 = 64.35V Float : 1.45x39 = 56.55V
egalisation : 1.7V/1.75v during 12 hours so we are at the max tension for multiplus : 66V I think .
I will do some measure while charging but all have been working fine for 5 years . I only think at a possible problem with the MPPT but I don’t see which parameter isn’t good …
I shut down the Multiplus for 4 days now , I’m on the grid only and I watch how the MPPT is doing “alone” and I think it is not working fine .
I show the display of VRM-Portal today :
And the last week while I shut down the inverter :
It seems that I never reach 100%
Pretty sure that the multi is limited to about 62v.
I made measures as the sun was shining a bit :
Pmppt=250W Ubatt=62V Upv=125V
My parameters can be seen below , I just changed the absorption tension to 65V so as to try to change something :
No , you can see it here 7. Technical specifications
Not really.
Spec sheet shows inverter operating up to 66v.
Not charging to 68v.
Victron Connect demo gives a charge limit of 64v for the multi.
Below the recommended? (your v figures) absorp and equalize voltages for 39 cell NiFe battery.
The mppt can probably reach those voltage targets, but can it maintain the voltage long enough (time) for a full charge cycle?
Just what Iwrote no ? You know my Multiplus work with these tensions since 2019 .
I used VEconfigure : I charged the 2020-parameters of the professional who sold me the batteries .
I put the Multiplus ON . It has gone on floating but the charge in only 92% .
I got problems with my settings but I don’t now what’s wrong …
If the MPPT is only giving 500W at 62V into the batteries but you then add a load and the system delivers enough power then the solar side is working. If you add a large load, what does the battery voltage do.
What voltage are your panels delivering to the MPPT. What are your BMV settings, perhaps your batteries are full and your SOC is reading lower than expected.
1 Like
Thanks for your reply . today , the sun is going down so I’ll try tests tomorrow :
Try to put a 2kW load while the sun is shining (not sure it will) and see what is going on .
When Idid this test some days ago , I saw that the MPPT delivers 2kW charging only when I got heavy load . That’s why I think I got a problem with my settings . Or perhaps , the MPPT could be hurt , a little broken or something … ?
I don’t think there’s a problem with the SOC miscalculated … I can try to put a 100% charge only with the grid . It will be easy .
Have you run any firmware updates?
Are you using the ess assistant?
If you are running ESS then the mppt follows whatever is programmed on the ve bus.
So no matter what you set the mppt to it will follow that. (If it has enough solar to do so)
Do you have the system under ESS in the GX to keep batteries charged?
Have you limited charge voltage in DVCC?
At 92% the target voltage of 66v has not been met. So there is another setting or device stopping it.
Thanks for your reply
I think theses things I don’t understand : ESS , DVCC 
could be the issue I’m facing .
How is your inverter programmed? Did you reprogram after updating the inverter? Are you using any assistants?
DVCC is on the gx itself
How ESS affects charging.. In the table it states the inverter charger controls it if there are no battery communications.
ESS is ON and configured .
DVCC is ON .
Testing today won’t be easy because it is very cloudy .
When the sun will shine , perhaps I can try to stop Gx-ColorControl so as to stop DVCC . I already have tried to do this in the past : stop DVCC for several days but it hasn’t changed anything .
ESS is charged in the inverter I think .
I wonder if it is possible , for a 5-years-old device like my MPPT to have a problem like this ?
Hello , some minutes with sun today . I connected a PC with VEconfig and somrthing very weird happened :
When VEconfig is open and linked , all seems to work fine , 2 kW charging
When I shut down the VEconfig App , the charging goes to zero !
There is a parameter that is wrong but which one ?
I see that the MPPT is good and that the problem is : What is making the charge been cut ?
Thanks if you have an idea .
My batteries are low , now : between 30 and 40% . So I was only consuming on the grid . When I returned back on the normal fonction : the system is charging again …
But I don’t know if it is working 100% because it seems there is no more sun today …
Today I disconnect the GX color control . And it worked fine , my batteries are 65% charged . Something might be wrong with yhe GX color control …
I have a question : how is it possible to stop the external control for a MPPT .
Even when I disconnect the different wires , it is written : external control and it is not charging as it might do .
Thanks
