Now up and running with my new batteries. With previous setup I had issue with the EV charging interfering with ESS and caused the battery (BMZ) to blow a fuse. I charge the car on night time tariff where I have set a nightly ESS charge schedule. I would not want to provide the car with power from the solar batteries as would drain them and the setup would not allow 7kw anyway. So how can I separate the 2 and ensure I do not have an issue. Obvious way is turn off my solar system but is there a better way via the ESS assistant. There are other postings similar to this but involve stuff like nodered that I have no knowledge or understanding of.
I take it the EV charger itself has load curtailment? You need the EV charger wired before the multiplus in order to stop the battery on the ESS being drained. I mentioned it in a YouTube short pause the video so you can see where it should be in the system diagram
Thank you Daza,
No I do not have load curtailment I have a 100A supply. The likelihood of loads taking it up to that value particularly after midnight is extremely unlikely. What you propose as a solution, to me, sounds quite novel the concept of a load at the start of the supply not having an effect further down is not something that has ever come to mind and initially seems alien to me. Will need to think that one through. I have several CU’s and they all come from a common Henley block and the EV charger is on a separate CU to the inverter which has its own RCBO anyway.(not that makes any difference as to what sees what). It would be quite easy to take that charger CU feed before anything else but as mentioned the thought of loads at the front of queue not influencing those further down is something that has never come to my mind. Being a practical person I would need to do some sort of test to prove it in front of my eyes even though you have practical experience of doing it.
Yeah sounds fair and I’m one that does like a test and sometimes you can’t believe what a manufacturer says that’s said I have two chargers wired up that way and wanted to test the load curtailment it’s very handy to have.
So I loaded up the system with the two chargers oven dish washer and batteries charging and was pulling 23kW yep that’s more than the 100amp fuse turns out when the newest charger I bought doesn’t like to protect the DNO fuse as per its literature, they tried some firmware solutions which limited it to anything under 63amps was ok, we had a disagreement with how much of the DNO approved 100amp fuse I could use then it was removed free of charge.
Now I’ve got a completely different make and it works a treat protecting the DNO fuse. I have now balanced them some one is the master and one the slave. This is all done by using the CT at different points of the supply cable ie the one at the service head is at a 100amp as it reads everything going through the supply the one behind it is at 75amps as it monitors the batteries and house load. Leaving the multi just taking care of the house on critical load only. Post a pic of your diagram so we can see the flow this is mine. What EV charger do you have?
HyperVolt Single Line Diagram 14kW.pdf (833.1 KB)
That is very neat. Is the drawing a particular drawing package you use? I have Turbocad but it does not make as good a drawing as what you have. I will need to redraw my layout as it has changed due to me completely revamping the system following failure of my previous Delios inverter. My new inverter is MP11 48/8000110/110/230V. A thought has occurred to me. Does the EV charger need to be physically close to the incoming or just the supply to it? Whilst with my setup the charger is on a different CU to the Inverter the cabling distance is about the same at 15M. The charger is a myenergi Zappi.
Thanks it’s not the first one I had some issues with two charger manufacturers so had to submit the updated chargers to the DNO so lots of single line diagrams lol. Draw.io is what I used and just grabbed images and added them into the diagrams.
No the charger could be 50meters from the source it wouldn’t matter, Are you using a clamp for the Victron, is it critical load only or AC IN feed back as well? Also I take it the Zappi has load curtailment via a clamp or is it through the Harvey I think they can do it wirelessly?
Edit: have you got a diagram that we can see to work out what is feed from what
Apols for not getting back I am snowed under or should it be sunned under with work on m y smallholding and have not forgotten about this topic.
Also try to do a detailed drawing of where wires go, so even if the system design isn’t there who ever is looking at it knows how it’s wired, so I made the single line diagram a blow up of the internal CU and what connects to what then an over view with the multiplus being the centre of the universe then where all the wires go.
I’ll post my short that I done as I don’t want to post the doc’s just in case someone follows it and causes a mischief, this is what I think best practice should be regarding diagrams. In the short you can see the system if you look at where stuff is it’s pretty much in the same location as the drawings
