Hello, we have an EVCS connected to the AC IN of two multiplus II’s ESS. We would like to be able to plug our cars in at any time and the charger always start at the minimum of 6A if no sun. We have no issue using our house batteries to charge the car.
The issue comes when we arrive home after work and need to charge, the sun has gone, I’m expecting the charger to start as we have Allow low excess solar power for auto mode enabled. But it doesn’t start, it only starts when there is 1.3kW of solar, which means the car receives no charge over night.
Are we expected to switch to manual mode or is this not working correctly? Allow low excess solar power for auto mode isn’t working as we expected.
With Allow low excess solar power for auto mode set to enabled, we find that once X amount of solar is being produced and the house batteries are above the SOC set it starts charging.
Would it be possible to allow us to select whether it starts charging with or without X amount of solar being produced. e.g. never wait for sun. We have our battery timeout set to 5 hours so once it does start to charge it will keep charging even with no sun.
Getting it to start charging in auto is the issue, so something along the lines of if waiting for sun switch to manual, then monitor solar for if solar > 1.5kw switch to auto.
All the settings are in the screen shot above. There are more settings via modbus but we haven’t looked as those yet due to making changing via modbus is unsupported.
Good idea if that is or could be an option in the future to change the amount of solar its looking for.
Yes, there are these registers which I was looking at earlier but the comment I made about being unsupported is highlighted in the spreadsheet.
Haven’t looked in much detail yet so I am not sure which parameters would need changing to kick start Auto mode. It can’t be any of the feedin options as ours will start long before any feed in happens, which is rare now winter is coming. First one I’ll probably look at is 5078 and 5083 by waiting longer than 30 minutes to see if it starts. I’ve only been waiting 10-20 minutes and then changing to manual mode.
You can modify all those settings, no support does not mean that you are losing the warranty, It means that if you are requesting support, we can’t help you because we don’t know what was modified. In case you need support, just restore it to default and that’s it.
I just wanted to point this out.
Lucian has encouraged people to use nodered with the supported nodes. I don’t believe you will have any issues implementing with this method. It does work.
I understand the warranty is fine, always try to do something along a supported route first. Have been playing with nodered for the EVCS, you can only really set the mode and change the current.
Based on the defaults we have also been trying to work out why the charger started fine last weekend, but not yesterday, ev charger settings not changed. Only real difference is solar.
Last weekend
At 08:54
1228w solar input (VE MPPTs)
116w Grid
47% soc
19w L1 in
606w L1 out
Yesterday (video in first post)
At 17:45
236w solar input (VE MPPTs)
61w Grid
99% soc
34w L1 in
659w L1 out
But that is what you want
e.g. every couple of minutes
Get 5009
Get PV prod
If PVp > 6A & 5009 != “1”
switch 5009 to “1”
Else
If 5009 =“1” & SOC > xx%
switch 5009 to “0”
maybe set max charging
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