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What size portable generator to L2 charge?

Posted: Mon May 23, 2011 6:06 pm
by DrRocket
How about a Honda suitcase generator in the trunk to charge the Leaf with 240 volts whenever you stop on a camping trip in remote areas? Or even 400 volts (I'm not sure who makes one)?

How do you figure out the size you need?

Re: What size portable generator to L2 charge?

Posted: Mon May 23, 2011 6:20 pm
by TonyWilliams
An L2 charge at 240 volt, 27.5 amps, would require a bigger generator than you'll want to carry. The suitcase gen would be good for trickle charge.

Re: What size portable generator to L2 charge?

Posted: Mon May 23, 2011 8:55 pm
by GroundLoop
A Honda EU2000i is rated for 2000W, 120v
Weighs 46lbs.

At full 2kW load, it will run 4 hours on 1.1 gallons of gas.

The L1 EVSE uses 1350W. Figure 5 hours, then?

So, a 5hr L1 charge at 1.1 gallons is good for 27 miles, or... 24mpg.

Re: What size portable generator to L2 charge?

Posted: Mon May 23, 2011 9:00 pm
by smkettner
You will need to be in the 4000VA+ range to get 240 volts and 16 amps out of a Honda.

Re: What size portable generator to L2 charge?

Posted: Mon May 23, 2011 9:59 pm
by TonyWilliams
The question was concerning L2 charging. Hopefully, folks can see that a 2kw generator isn't even close?

Sure, you can use teeny, tiny generators, but they won't run the L2 at 6.6kw (240 volts times 27.5 amps) needed from a "real" home type charger. That will take a real generator; not the type that you would want to carry around.

But, if we're talking about a generator to use with the modified Nissan "carry-along charger", presumably at the future 16 amp (3.84kw at 240v) or 20 amp (4.8kw at 240v), then something smaller would work.

You don't have to guess the size. It's simple math. How many amps times volts do you want? And don't be sold on the MAX power... use the rated wattage.

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The Honda EU2000i (2kw max, 1.6kw rated, 13.3A) is only 120V. But, it can be connected to another like 47 pound unit to make 3.2kw rated power. Still 120v as far as I know and $1280 each.

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The Honda EU3000i 3kw max, 2.6kw rated (21.7A) can also be connected to a second generator for 5.2kw rated. 78 lbs each, $2600 each.

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To get the 240 volts in a Honda, you'll need the EU6500iS. 120/240V 6.5kw max, 5.5kw rated (45.8 amps @ 120 volts / 22.9A @ 240V)

Starting System: Recoil (pull) and electric!

Dry Weight 260 lbs, $4500 each (only one required).

Re: What size portable generator to L2 charge?

Posted: Tue May 24, 2011 8:09 pm
by DrRocket
Well that ends that idea.

Thank you for the input.

Cold fusion anyone, anyone.....Buehler? :lol:

Re: What size portable generator to L2 charge?

Posted: Wed May 25, 2011 9:55 pm
by AmarilloLeaf
Sams Club has a generator with a Honda engine, 240v , 7kW for $999

http://www.samsclub.com/sams/shop/produ ... ction=push

Not exactly portable. I looked at this in the store, and it would work nicely with Ingineer's 240v modified EVSE.

I don't think it would quite fit in the rear of the car, plus I don't want to stink up my Leaf with gasoline smell.

It would make sense as a rescue service in a tow truck. Rather than towing the Leaf, simply recharge it at the roadside for 30 minutes and then drive to the nearest socket for more charging.

As EVs become more common, I would expect this service to become available...

Re: What size portable generator to L2 charge?

Posted: Wed May 25, 2011 10:11 pm
by gbarry42
GroundLoop wrote:So, a 5hr L1 charge at 1.1 gallons is good for 27 miles, or... 24mpg.
Thanks for working that one out for us.

I probably don't need to remind our readers that if you want to charge your battery from a gasoline generator, you can get that already set up for you. Chevrolet makes one :D And while you'll spend a bit more, you can get 37 MPG with it.

Re: What size portable generator to L2 charge?

Posted: Wed May 25, 2011 10:59 pm
by TonyWilliams
AmarilloLeaf wrote:Sams Club has a generator with a Honda engine, 240v , 7kW for $999.

Be sure any generator is safe for electronics (the Honda's are) and use their "rated KW", continuous duty power rating, not the advertised peak rating.

Re: What size portable generator to L2 charge?

Posted: Wed May 25, 2011 11:02 pm
by EVDRIVER