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Re: 480v DC from two 240v AC sources

Wed Aug 07, 2013 10:09 pm

Genius, EVDriver - cant tell if your being facetious or are solving all of our problems at once.
Sure it'd get you 480, but how would you ever get from the two L2 chargers? :lol:

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Re: 480v DC from two 240v AC sources

Wed Aug 07, 2013 10:12 pm

planet4ever wrote: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.

And, to help the OP, ... 30#p262630" onclick=";return false; is a diagram posted by planet4ever.

Besides needing to convert the AC to DC, in order to plug-in to the CHAdeMO port and successfully charge would require the connector and being able to "speak" CHAdeMO's protocol and pass whatever tests the car does before starting and during the charge.

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Re: 480v DC from two 240v AC sources

Thu Aug 08, 2013 6:07 am

^ A variation on that, could you put 40 car batteries in series, and have 40 12v chargers... or perhaps a smaller number, like 10 chargers and some switching mechanism.
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Re: 480v DC from two 240v AC sources

Thu Aug 08, 2013 6:44 am

Similar issues as was discussed previously in the topic "How difficult would it be to build a J1772->CHAdeMO adapter?": ... 16#p306137" onclick=";return false;
Note that single phase service is what most people have at their home, and it is usually only designed for 200 amps.
A 50 KW Eaton DCQC delivers 120 amps DC when it starts charging a LEAF with a battery below around 6/12 bars. And it is a really big box with five 10 kW inverter rack mounted modules, as shown in the picture in the link in the referenced thread.
With enough $ anything is possible, but trying to do DCQC from single phase 200 amp 240V AC service is completely impractical.

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Re: 480v DC from two 240v AC sources

Thu Aug 08, 2013 9:47 am

planet4ever wrote: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.

use a converter like the current fast chargers do. all power comes from something and A/C is the ONLY way it comes from the Power company so it has to be turned into DC at the destination
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