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One of the best ability the inverters has is to switch off very quick when grid fails, that it's unnoticeable to the loads.
However when our 3-phs MP-ll inverter is connected to the 3-phs machine load, when grid fails it switches off and we have to manually switch it (3-phs machine load) back on again. We have tested with a PC and when grid fails and switches over to inverter the PCs stays on.
Is it because one is a 3-phs and the other a single phase or there's something I'm missing?
If the system itself is not switching off, then it may be a protection circuit on your 3 phase device.
Ithe three phase device may be detecting a sudden voltage or frequency change and then shuttting down in protection.
Is there anyway I can rectify this and stop it from occurring?
Are there any electronic controls of thebthree phase load? What load is it? Some pump controls like i said previously detect voltage drop (brownout condition) and then disconnect on protection.
W hat is your AC low cut off before disconnect and are you using a grid code at all and LOM detection?
If it is not a battery related issue as @nickdb mentioned then it could be the disconnect voltage.
The load is:
Re-Flow Oven (please not it tends to draw a lot on startup)
Make: DIMA
Model: SMRO-0253
Yes it has a controller.
when we switch it on (on gride) it works fine but when grid fails and the inverter kicks on it switches off and we have to manually switch it back on.
After switching it on (while inverting) it works fine but when grid comes back on this time however it does not switch off as it goes on grid it continues
What is the load? Do you have any vrm charts from when it is running normally?
What alarms/alerts is the system logging on VRM or on the GX?
This has not been uncommon with some systems using freedom won batteries, often traced back to the battery being incapable of meeting the surge in demand when transitioning from grid, and where the inverter size is larger than that recommended by the manufacturer.
Please confirm what your battery setup is.
Some detailed (zoomed in) vrm charts covering this event showing battery voltage, current, soc and min/max cell voltages as well as AC voltage and AC loads would be helpful.
@nickdb Thank you
The load is:
Re-Flow Oven (Please note it draws a lot on startup)
Make: DIMA
Model: SMRO-0253
When it’s on grid:
There is no alarm
The Battery Setup:
connected to a 3-phs with 5KVA victron inverters
When grid is off and it’s inverting:
The only alarm that shows up is that the grid is lost
I hope these are all the charts you needed.
Around 08:36-39 is when we switched over to inverting
EDIT: when we switch it back to grid the machine (load) does not switch off it stays on.
so, min/max voltages are fine for cells.
Is your battery getting to 100% SOC? this snapshot only seems to show around 95%?
Have you double checked your ESS cutoff voltages in the assistant?
VRM is unfortunately not very granular, so it can miss the detail in that specific moment.
This sort of complaint has been a bit too common in systems with some FW batteries.
It is possible that in grid transition that the battery is just overwhelmed causing the loss of power. If you had an overload (from surge loads) you would expect the GX/inverter to log it.
Since this can be reproduced, what you can try is to connect to the multis with a mk3 and ve configure, use the VE bus monitor which should show realtime detail like ripple etc.
Reproduce the problem and see if the monitor gives any clues why.
