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Hi all
I have 2x MultiPlus-II 48-5000 in parallel.
I have set to my grid feed in to -70w.
My batteries are never below 50% Lithium.
But i keep or should i say, victron keeps sucking from grid about 2KW per day
Has any one else got this problem or more so how to fix this ??
I just dont understand, spent good monies and still sucking from grid especially when i dont need to, it just frustrating
Cheers all
There is always going to be some push and some pull from the grid. You have 2 inverters so that makes things a little worse.
I have found that a lot off other inverter manufactures average the data so you don't see the push and pull but it happens with all grid-tie systems.
Why, because the inverter is having to track the grid voltage. When you turn on a load of 1.5kw, the power will first come from the grid. The inverter will see the load and then ramp up to meet that load. Now how does the inverter control how much power it is pushing out onto the grid? It adjusts it's output voltage, increase voltage, more power flows from the inverter, lowers voltage, less power flows from the inverter. This is great but the grid voltage is always changing so the inverter is having to adjust the voltage all the time. This will show up as that push and pull. You will see 0W, then -70W and then 70W, etc. Over time this should average out to 0Wh from grid.
The next thing to keep in mind is that the inverter/CT are not accurate! I have seen 1kWh per day of difference between the inverter and the grid meter. Can you confirm these readings from the utility? Also on paralleled systems it isn't a great idea to use inverter metering, you should use a meter. Does your installer have experience with paralleled systems?
If you wouldn't mind, you can share a public link to your VRM dashboard, I and others would like to see the data for ourselves.
Thank you for the reply and sorry for my very late response !
Yes the pull and push logic, i understand and do accept fully and has been explained to me by my supplier/installer.
The problem i am seeing is very different , say i have a load on already @1.5kw for 15 minutes and is drawing from the batteries, working as it should.
Then for no reason at all, the inverters like go into a spasm, you can actually hear them, they ramp up, suck from the grid 1.8kw, power the same, still load @ 1.5kw and charge the batteries 300w. All this spasm for about 45 seconds. This could happen 4x in an hour !
This spasm thing is were i believe the problem sits and the spasm thing is what i cant accept logically !!
Thank you Mendo
Hi @Mendok,
Are you using an external energy meter?
Please check to see what setting is selected for the "Grid metering" option in the ESS menu of your GX device, and that it reflects how the system has been installed.
It also appears from your screenshot that the PV inverter is incorrectly configured (both discharging the battery 589W, plus PV inverter production +590W, plus import from the grid +2900W) = 4079 W of energy supplied to a load of only 3344 W.
So double check the AC PV inverter position in the PV Inverters menu of the GX matches the physical wiring of your system (or just chance to to the opposite and see if the numbers all add up correctly then).
Anyone got any comments on last pic??
Surely i couldn't be the only one in the world with this problem??
@Mendok Can you post a screen shot of your grid power on from the advanced tab?
This is very strange. Mine is set to 0W and I will use around 0.1kWh per day from grid.
This could have been a really good day today.
PV produced 18kwh, consumed 7.6kwh
Why in this world would i have sucked 0.8kwh???
Come on victron????
Its a program and the inverter is told what to doooo
Is the unit faulty??
please
As long as you are connected to the grid, the inverter will always use some power, around 50watt, this is to run the controls and keep the grid frequency tied in and synchronized. There is definitely a problem with a setting in your system that it is using over 2000watts of external power. When you set up your parallel system did you program the inverters separately (although they remained connected) you must set up the settings in Remote Configure, save them, then send the settings to each inverter separately. Also it's always best to have your batteries ( Optimized With Battery Life) unfortunately its not easy to spot the problem without actually having access to your VRM portal
Hi mate, 
