Cruising
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480v DC from two 240v AC sources

Tue Aug 06, 2013 8:51 pm

Has anyone done this?
I already have the 240v adapter from 120v sources on different legs,
but has anyone found a way to use two 240v chargers, plugged into a form of adapter/ AC-to-DC converter?

Thanks

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planet4ever
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Location: Morgan Hill, CA, south of San Jose

Re: 480v DC from two 240v AC sources

Tue Aug 06, 2013 9:25 pm

Sorry, but that sounds crazy. There are no ""two separate legs" of 240v home alternating current to combine to double the voltage. Now if you had three-phase power into your home, you would be using two legs of the three to get 208V, and could increase the voltage by using all three.

Besides, the external charger not only needs to convert AC to DC but it also has to dynamically adjust the voltage to accord with the requirements from the car's battery controller. I'm not sure that it makes much difference in its internal size, weight, cooling requirements, and general complexity what AC voltage it starts with.

Ray
End of April 2013: Traded my 2011 SL for a 2013 S with charge pkg.

Cruising
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Delivery Date: 06 Aug 2013

Re: 480v DC from two 240v AC sources

Tue Aug 06, 2013 9:33 pm

Thanks Ray.
I was thinking more an L2 public charger, where if two were available, getting out of there twice as fast with the use of an adpter & step converter device of some creation.

Kyle

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planet4ever
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Location: Morgan Hill, CA, south of San Jose

Re: 480v DC from two 240v AC sources

Tue Aug 06, 2013 10:10 pm

That public charging station is an EVSE, not a charger. The charger is built into the car. The EVSE is essentially just a sophisticated safety switch. It does nothing to the voltage, or the phase, and it certainly doesn't convert AC to DC. Whatever comes out of your wall is exactly what goes into the car. Hooking two of them up together would not change the voltage or the current in any way, but it would undoubtedly terminally confuse the communication between the charger in the car and the EVSE.

Ray
End of April 2013: Traded my 2011 SL for a 2013 S with charge pkg.

Cruising
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Re: 480v DC from two 240v AC sources

Tue Aug 06, 2013 10:14 pm

So, realistically speaking. There is no way to throw money at a mobile option to take with me, where only Level 2 charge points, exist - thereby, granting me a fast charging option?

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TonyWilliams
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Re: 480v DC from two 240v AC sources

Tue Aug 06, 2013 10:18 pm

Cruising wrote:So, realistically speaking. There is no way to throw money at a mobile option to take with me, where only Level 2 charge points, exist - thereby, granting me a fast charging option?
1) Unlimited budget? Sure. I use two combined J1772s to make 40-60 amps, but no current LEAF can use more than 30.

2) Add multiple onboard chargers with each having its own dedicated J1772 inlet (see Brusa thread)

3) Build portable CHAdeMO charger to pull from 50-100 amp circuits at up to 24kW (see dedicated thread)

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DaveEV
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Re: 480v DC from two 240v AC sources

Tue Aug 06, 2013 10:40 pm

TonyWilliams wrote:Add multiple onboard chargers with each having its own dedicated J1772 inlet (see Brusa thread)
For reference: Adding a Brusa charger under the hood for '11/'12s

Smidge204
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Re: 480v DC from two 240v AC sources

Wed Aug 07, 2013 6:18 am

Making 480V three-phase out of 240V single phase is easy!

Couple a 240V motor to a 480V/3PH alternator, add in appropriate overcurrent protection, and you're good to go.

That's not nearly as crazy as it sounds and it's actually done quite often. There's no power related advantage to it, though - in fact you lose quite a bit of power in the conversions. It's only done when three-phase power is required but simply not available.
=Smidge=

Cruising
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Re: 480v DC from two 240v AC sources

Wed Aug 07, 2013 7:54 pm

Sorry Smidge - are you saying the current L2 port is used AND a separate mini 240v motor is installed somewhere on-board?

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EVDRIVER
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Re: 480v DC from two 240v AC sources

Wed Aug 07, 2013 8:40 pm

40, 12V cigarette lighter plugs in series with long cords will solve the problem.

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