Hello
First off I'm not an electrician but I am trying to understand the EPS wiring and what is physically required to be fitted.
Nothing discussed here will be done by anyone other then an electrician to be clear.
I am UK based.
So I currently have a normal 12 way 3 phase distribution board.
It currently has no Surge Protection as was done awhile ago.
It has 5 circuits all relatively low powered apart from 1 which is an EV charger.
Nothing 3 Phase is wired at the workshop.
We have a TT earth setup with a dedicated Earth Rod in the building.
Batteries will be connected later so at this stage actually utilising EPS is not possible according to everything I have read as EPS will only work with batteries connected. So I assume that you cannot even wire up EPS and just let it act as though it will still power down in the event of a power cut. I do stand to be corrected from any experts here.
Now I am having the H3 Pro 30kw inverter installed I want to understand a few things
According to the wiring diagrams in the Manual the EPS needs to be wired to a distribution board.
1. Does this distribution Board need to be separate or can it be fitted in the same distribution Board that is supplying the workshop currently?
2. Is it true that there will technically be 10kw per phase aka if the EV Charger was fitted to it's own dedicated phase of the EPS at 7.4kw it would be fine.
3. According to the manual I only need to have the EPS wired up to the EPS loads with nothing else?
The reason I am asking all this is that currently I am being quoted for a new 3 phase board but this means that technically if my current 3 phase board would be adequate if an SPD is fitted to connect my current setup then I only have to have a sub 3 phase board fitted that connects to the EPS output. Leaving my current Distribution Board having only the Inverter connected to it.
If there is any useful technical information or links to reading so that I can understand better then it would be much appreciated.
Many thanks for any help or guidance that can be given.
1. Does this distribution Board need to be separate or can it be fitted in the same distribution Board that is supplying the workshop currently?
It depends on what space you have spare vacant on your distro board. You need to fit the Chint DTSU666 meter (4 pole space) and a 3 phase CB for it. You also need a 3 phase CB for the inverter itself. So that is like 10-12 poles (depending on if you use 3 or 4 pole CBs).
When you get the battery, you will also need another 3 phase CB for the EPS and space for the ATS switch.
2. Is it true that there will technically be 10kw per phase aka if the EV Charger was fitted to it's own dedicated phase of the EPS at 7.4kw it would be fine.
Technically yeah, you will have to think how you want to evenly distribute your backup load over the 3 phases from the EPS so none of them are overloaded.
3. According to the manual I only need to have the EPS wired up to the EPS loads with nothing else?
It depends on how you want your backup to work. If you have loads wired to the EPS and nothing else anytime you turn off the Inverter or say it does a software update your EPS loads will stop.
A better way to do it is to remove whatever you want backed on your distro board from the main CB and place them into the OUT of an ATS switch. The IN on one side of the ATS switch has the 3 phases going into it from the grid MCB and the other side has the EPS from the inverter. This is like a Y one side is the grid, the other the EPS, bottom Load OUT is your backup (whatever you want backed up in your dirsto board) and the center of the Y is where the changeover switch is.
It depends on what space you have spare vacant on your distro board. You need to fit the Chint DTSU666 meter (4 pole space) and a 3 phase CB for it. You also need a 3 phase CB for the inverter itself. So that is like 10-12 poles (depending on if you use 3 or 4 pole CBs).
When you get the battery, you will also need another 3 phase CB for the EPS and space for the ATS switch.
2. Is it true that there will technically be 10kw per phase aka if the EV Charger was fitted to it's own dedicated phase of the EPS at 7.4kw it would be fine.
Technically yeah, you will have to think how you want to evenly distribute your backup load over the 3 phases from the EPS so none of them are overloaded.
3. According to the manual I only need to have the EPS wired up to the EPS loads with nothing else?
It depends on how you want your backup to work. If you have loads wired to the EPS and nothing else anytime you turn off the Inverter or say it does a software update your EPS loads will stop.
A better way to do it is to remove whatever you want backed on your distro board from the main CB and place them into the OUT of an ATS switch. The IN on one side of the ATS switch has the 3 phases going into it from the grid MCB and the other side has the EPS from the inverter. This is like a Y one side is the grid, the other the EPS, bottom Load OUT is your backup (whatever you want backed up in your dirsto board) and the center of the Y is where the changeover switch is.