3-Phase Adapter

How do you store and manage your electricity?
Post Reply
User avatar
4Springs
Site Admin
Posts: 708
Joined: Thu, 23 Dec 2010, 01:14
Real Name: Christopher Walkden
Location: Selbourne, TAS

3-Phase Adapter

Post by 4Springs »

We are in the middle of converting a Mighty Boy, and the installed battery is starting to get low. Two of the LFP cells are down to 2.5V and the rest are also lowish. We have a 144V charger connected, and so we'd like to use that to charge them all up. But the charger draws 14 A, and there are no 15 A power points nearby, and the car isn't ready to be driven yet!
There is a three phase outlet nearby though, so I think we should be able to make an adapter?
Here is the outlet:
ppt1.jpg
ppt1.jpg (2.53 MiB) Viewed 424 times
I think this should supply 20 A per phase, is that correct?
If so then I think we should be able to marry one of these:
15A.png
15A.png (314.54 KiB) Viewed 424 times
to one of these:
20A.png
20A.png (174.71 KiB) Viewed 424 times
This is urgent, as the vehicle is in a school that is about to close for the Christmas break. Hopefully we can get a few hours charge into it.
Are we on the right track? Which pins need to be connected for us to break out one phase and earth? Or I imagine we can look that up...
User avatar
jonescg
Senior Member
Posts: 3762
Joined: Thu, 21 Jan 2010, 23:05
Real Name: Chris Jones
Location: Perth, WA.

Re: 3-Phase Adapter

Post by jonescg »

Nothing wrong with pinching a phase and neutral from the plug, just make sure you pass it through a mobile RCBO.
AEVA National Secretary, WA branch chair.
User avatar
coulomb
Site Admin
Posts: 4497
Joined: Thu, 22 Jan 2009, 20:32
Real Name: Mike Van Emmerik
Location: Brisbane
Contact:

Re: 3-Phase Adapter

Post by coulomb »

Unfortunately that 3-phase outlet only has 4 pins. So that will be 3 phases and an earth. You can't use the earth for carrying non-fault current, certainly not 14A continuous. So all you have is 400V+ phase to phase, which your charger will almost certainly not appreciate, and will likely get blown to bits.

So that outlet is for three-phase loads only. Are there other outlets with 5 pins?

[ Edit: 3 pins → 4 pins. I can count now :-O ]
Nissan Leaf 2012 with new battery May 2019.
5650 W solar, 2xPIP-4048MS inverters, 16 kWh battery.
1.4 kW solar with 1.2 kW Latronics inverter and FIT.
160 W solar, 2.5 kWh 24 V battery for lights.
Patching PIP-4048/5048 inverter-chargers.
User avatar
4Springs
Site Admin
Posts: 708
Joined: Thu, 23 Dec 2010, 01:14
Real Name: Christopher Walkden
Location: Selbourne, TAS

Re: 3-Phase Adapter

Post by 4Springs »

coulomb wrote: Mon, 14 Dec 2020, 15:56 Unfortunately that 3-phase outlet only has 3 pins. So that will be 3 phases and an earth. You can't use the earth for carrying non-fault current, certainly not 14A continuous. So all you have is 400V+ phase to phase, which your charger will almost certainly not appreciate, and will likely get blown to bits.
Great, thank you, that explains it nicely.
I saw this this morning before I went shopping, and knew that I needn't purchase those parts.
coulomb wrote: Mon, 14 Dec 2020, 15:56 So that outlet is for three-phase loads only. Are there other outlets with 5 pins?
It doesn't appear so, no.
Plan B is to charge the lowest two cells (the ones measuring 2.5 V) up to 3.1 V with a benchtop power supply, and disconnect the BMS modules from the remainder.

Once the vehicle is mobile then charging won't be a problem. There are 15 A outlets on site, but to get the vehicle to one of them would require several doors to be unlocked, plus moving the unpowered and unregistered vehicle along busy city streets to get it into an appropriate place.
User avatar
Bryce
Senior Member
Posts: 427
Joined: Sun, 13 Jun 2010, 16:54
Real Name: Bryce Gaton
Location: Melbourne

Re: 3-Phase Adapter

Post by Bryce »

Hi there - I often use a constant voltage/constant current benchtop power supply for just that purpose. I set the voltage in gentle stages to bring the cell back to the rest of the pack and set the current to a suitably safe level to avoid cooking it. (2 or 3 amps max).
Cheers
Bryce
Current EV drive: 2019 Kona electric
Also in family: 2019 Renault Zoe
Past drives: 2011 Blade Getz, 2011 Leaf, 2001 Citroen Berlingo conversion
Past Conversions: DC Berlingo, AC Berlingo, AC Sprinter
OzSpider
Noobie
Posts: 21
Joined: Mon, 14 Dec 2020, 10:02
Real Name: Derek
Location: Brisbane, Australia

Re: 3-Phase Adapter

Post by OzSpider »

Non-electrical persons thought here. Could you make a double lead to take power from 2 separate 10A GPOs? Probably safer at a single phase only dwelling to avoid phase to phase short...
antiscab
Senior Member
Posts: 2719
Joined: Mon, 26 Nov 2007, 05:39
Real Name: Matthew Lacey
Location: Perth, WA

Re: 3-Phase Adapter

Post by antiscab »

We call those suicide leads, as it's easy to make the other male end live and exposed at the same time.

If on different rcbo it will also trip both rcbos

Note, you can usually get away with pulling 14A from a 10A point, as they're usually protected by a 16A rcbo.
Matt
2017 Renault zoe - 25'000km
2007 vectrix - 156'000km
1998 prius - needs Batt
1999 Prius - needs batt
2000 prius - has 200 x headway 38120 cells
User avatar
brendon_m
Senior Member
Posts: 773
Joined: Sat, 28 Oct 2017, 11:00
Real Name: Brendon McCarrol

Re: 3-Phase Adapter

Post by brendon_m »

Personally before I went down the path of making a sketchy adaptor like that I'd just plug the charger into a 10A gpo. It's only 14A, the wiring should be capable and as long as there's nothing else running off the same circuit the rcd won't pop. Fine for a short term, get out of trouble situation.
OzSpider
Noobie
Posts: 21
Joined: Mon, 14 Dec 2020, 10:02
Real Name: Derek
Location: Brisbane, Australia

Re: 3-Phase Adapter

Post by OzSpider »

antiscab wrote: Sun, 10 Jan 2021, 08:02 We call those suicide leads, as it's easy to make the other male end live and exposed at the same time.
Good tip, mental note to avoid ever doing that! :shock:
Dean Williams
Noobie
Posts: 5
Joined: Sun, 17 Jan 2021, 18:38
Real Name: Dean

Re: 3-Phase Adapter

Post by Dean Williams »

would it not just be sensible to get a 15 amp outlet installed?
User avatar
brendon_m
Senior Member
Posts: 773
Joined: Sat, 28 Oct 2017, 11:00
Real Name: Brendon McCarrol

Re: 3-Phase Adapter

Post by brendon_m »

Yes but this was a short term, had to be solved quick problem
Post Reply