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Dual Charging

Posted: Mon, 03 Jun 2019, 10:15
by Kasterborus
I knkw this may be a tad petty to some people, however I am looking to convert an old truck to EV

As a result of this I am looking to use approximately 2 tonne of battery pack which will give me roughly 180 to 200 kilowatt hours of storage.

Now this is going to be a lot of power required to charge it.

Looking at most of my local charges they are between 6 and 22 kilowatts so that means that it would take a range of 7-26 hours to charge it (Assuming 20% remaining, so I'd need around 160 kWh)

Now with these time frames in mind I was wondering if it is possible to hook up 2 charging ports and be able to charge off 2 chargers simultaneously?

I know that this mean I'm taking up 2 charging ports for people, but on the flipside, I'm there for half as long.

Ideally if I had a 50 or 100 kilowatt charger near me this would be a moot point, and obviously I'd like to setup to take that if it's there, but looking at local options, a high speed charger isn't one near me.

Re: Dual Charging

Posted: Mon, 03 Jun 2019, 18:47
by 4Springs
I haven't seen a DIY vehicle with DC fast charging.
No reason why you couldn't use two AC charging sockets at once. Need a few onboard chargers, but if money is no object...

Re: Dual Charging

Posted: Tue, 04 Jun 2019, 10:39
by jonescg
Jack Rickard had a ChaDeMo kit for conversions which was being used on occasion but it did seem like a lot of work, particularly when most EVs were running less than half the voltage normally used by OEMs. So a 144 volt DC conversion would still only charge at 120 amps, which is only 17 kW. More than most AC chargers but you can just as easily install three 7 kW chargers and use a conventional Type-2 connector.

Re: Dual Charging

Posted: Wed, 05 Jun 2019, 13:02
by Kasterborus
4Springs wrote:
Mon, 03 Jun 2019, 18:47
I haven't seen a DIY vehicle with DC fast charging.
No reason why you couldn't use two AC charging sockets at once. Need a few onboard chargers, but if money is no object...
Is that a cost limitation or a practical limitation?

Re: Dual Charging

Posted: Wed, 05 Jun 2019, 16:30
by 4Springs
Kasterborus wrote:
Wed, 05 Jun 2019, 13:02
Is that a cost limitation or a practical limitation?
The DC fast charging requires interfacing with the fast charger computer. So it's a combination of having the right voltage as jonescg says, and working out the software. You'd need to have a good idea what your battery is doing so you can give the appropriate feedback to stop something exploding. Nothing off the shelf will do this as far as I've seen.

The AC would just be cost and size/weight. Last time I looked, a 3.5kW charger cost about $2000. Just add them up! So a Type 2 socket can provide up to 22kW if wired in to the right supply, this would be about 6 of them, so $12,000. Double that if you want to charge from two sockets as you mentioned. Perhaps 5kg each, 500 x 200 mm, leave enough room for cooling fans.
If you have a big battery, charging at this rate (44kW) probably wont' make too much heat, but it's something you'd need to allow for.

Re: Dual Charging

Posted: Wed, 05 Jun 2019, 23:42
by antiscab
6 x 6.6kw Tc chargers would get you there.

AU $1,148.98 each
https://s.click.aliexpress.com/e/c9czg8tK

Alternatively, if your system voltage is 700v or so, I would use a vfd to charge on 3phase.