Discuss EV charger on split phase? in the Electrical Forum area at ElectriciansForums.net

brianmoooore

-
Esteemed
Arms
Reaction score
4,145
Welcome to ElectriciansForums.net - The American Electrical Advice Forum
Head straight to the main forums to chat by click here:   American Electrical Advice Forum

I have a single 7kW EV charger that serves three holiday cottage. The supply to it is E7, with the night rate currently at exactly half the day rate, so most users charge at night, controlling the charge from apps. on their 'phones.
Batteries are getting bigger, so it's becoming difficult to get a full charge completely at the off peak rate, and it's only a matter of time before I get two or more EVs here at the same time, both wanting to charge.
I have a 3 wire, 2 phase supply to my property, (commonly, inaccurately referred to as split phase) which is 230 volt - 0 - 230volt, with a phase difference of 180 degrees between the two phases.
What do those of you out there who have loads of experience with EV chargers think would happen if I swapped the single phase charger for a three phase one, but with only two phases used of course?
14kW charging? The whole thing shut down and refuse to work? A funny burning smell?
 

Julie.

Esteemed
Arms
Reaction score
4,170
It's nothing to do with the "charger" as you call it.

The usual 7kW/22kW charge points, are charge points NOT chargers!

All they do is communicate with the car's internal charger as to the rate/current they are rated for, and switch on the 230/400V supply to the vehicle when the vehicle requires it.

So in reality if the charge point is 7kW it will tell the vehicle it can take up to 7kW single phase. If it's a 22kW then it will tell the vehicle it could take up to 22kW over three phases.

It is then up to the vehicle, if the in-built charger is 7.5kW, then it would charge at 7kW on the 7kW charge point, and 7.5kW on the 22kW charge point.

Some vehicles will require either a single phase or true three-phase supply for the charger to work correctly. Others would accept either single phase or two or three single phase supplies (could be 2 at 180 degrees or 120 degrees or whatever) This is down to the design of the charger within the vehicle.

I would think that none of the vehicles would be damaged by two out of three phases, irrespective of the phase angle; but I would expect that some would not charge at the higher rate (more than the single phase rate) and some may shut down charging completely until a single phase or full three phase supply is obtained.
 
Reaction score
8
I have a single 7kW EV charger that serves three holiday cottage. The supply to it is E7, with the night rate currently at exactly half the day rate, so most users charge at night, controlling the charge from apps. on their 'phones.
Batteries are getting bigger, so it's becoming difficult to get a full charge completely at the off peak rate, and it's only a matter of time before I get two or more EVs here at the same time, both wanting to charge.
I have a 3 wire, 2 phase supply to my property, (commonly, inaccurately referred to as split phase) which is 230 volt - 0 - 230volt, with a phase difference of 180 degrees between the two phases.
What do those of you out there who have loads of experience with EV chargers think would happen if I swapped the single phase charger for a three phase one, but with only two phases used of course?
14kW charging? The whole thing shut down and refuse to work? A funny burning smell?
Most likely the charge point wouldn't care (it is probably just 3 single phase units under a single control system) but the vehicle would! If the vehicle can take a 3-phase (22kW) supply, that is exactly what it is looking for!

Perhaps your better bet would be to supply a second single-phase 7kW unit on the other phase.
 

Reply to EV charger on split phase? in the Electrical Forum area at ElectriciansForums.net

Similar Threads

Hi Everyone, before I start ill admit I have very little knowledge of EV chargers etc, I have had a question from a customer who has had a 7kw...
Replies
7
Views
473
Hi all, Newly qualified electrician here who is in the process of re-wiring my own property. I have recently converted my old CU (if I can call...
Replies
2
Views
258
Evening everybody. A Landlord who's pub I do a bit of work in called me today to discuss putting an EV Charger in for customer use. His idea was...
Replies
5
Views
422
Has anyone installed the Gen 3 Tesla EV charger. Is an RCD required at the supply as it says it has a type A one built into the unit. Also can...
Replies
1
Views
283
Is there a relay I can get that will work to turn a 240v 50a ev charger on and off using an Arduino board or z wave module? I was going to get one...
Replies
27
Views
999

New Posts (Please Reply)

Electrical Forum

Welcome to the Electrical Forum at ElectriciansForums.net. The friendliest electrical forum online. General electrical questions and answers can be found in the electrical forum.
This website was designed, optimised and is hosted by Untold Media. Operating under the name Untold Media since 2001.
Top