Currently the trend is the opposite. Manufacturers are up-specing to 11kW in car chargers. IIRC even the Bolt now offers a larger charger option.
Tesla can't even shed the 12v legacy system.
-
Want to remove ads? Register an account and login to see fewer ads, and become a Supporting Member to remove almost all ads.
Wishing Out Loud: A mini Tesla DC charger
- Thread starter SageBrush
- Start date
Currently the trend is the opposite. Manufacturers are up-specing to 11kW in car chargers. IIRC even the Bolt now offers a larger charger option.
Tesla can't even shed the 12v legacy system.
Yes, a 200A 240V service is a nice round number. I happen to have an empty space in my main panel for a second 200A main breaker. However, if you had a 208V service, you should probably load all three phases. In that case 100A 208V 3-phase is 36kW which should be fed with a 125A breaker.
Many residential 240V service panels are also limited to 125A breakers on the main bus. This is perfect for the available 24kW DCFC units on the market.
The use case for this unit is bi-directional. If you have taken energy out of the car to supplement your house, you probably need to put it back more quickly before you drive again.
Or anywhere (or anytime) the power grid isn't stable, then in the short time that the electric grid is back up before falling over again.
True. However, your extra high stress on the grid when it is working probably isn't going to be helping the situation.
Who is this for? A family of Uber drivers who relax at home by welding?
There's a marginal payback at best to use a couple of powerwalls to do demand response. The powerwalls are further justified for providing some backup power. Spending dollars to chase the marginal savings beyond the standard solar plus battery is almost certainly very uneconomic.
I think dcbel is trying to do the job that Powerwalls can do, but using the car's traction battery pack instead of stationary batteries.Who is this for? A family of Uber drivers who relax at home by welding?
There's a marginal payback at best to use a couple of powerwalls to do demand response. The powerwalls are further justified for providing some backup power. Spending dollars to chase the marginal savings beyond the standard solar plus battery is almost certainly very uneconomic.
The electronics are not that challenging nor that heavy. It is basically one good sized PCB in the Teslas that does the work. Inside the car or in the mobile charger... the job is the same. Probably about 25 to 50% larger than the existing mobile charger.
Electronics shouldn’t be challenging, but the problems with CCS and multiple brands of EV are proving to be difficult to solve. Brand “A“ charger should work with brand “A“ car though.
I was basing the weight off of a spec I found for a MS gen 2 11kw onboard charger of 35lbs. The onboard charger is liquid cooled, so I figured 15lbs of heat sink/cooling and consumer protection, and you might as well beef up the electronics to handle 20kw.
It's like two Gen1 chargers. The way I would do the math is to subtract 15lbs of heat sink/cooling, double the rest and then add back the cooling. That comes to 55lbs for 20-24kW.Electronics shouldn’t be challenging, but the problems with CCS and multiple brands of EV are proving to be difficult to solve. Brand “A“ charger should work with brand “A“ car though.
I was basing the weight off of a spec I found for a MS gen 2 11kw onboard charger of 35lbs. The onboard charger is liquid cooled, so I figured 15lbs of heat sink/cooling and consumer protection, and you might as well beef up the electronics to handle 20kw.
It is interesting how not cheap this type of product is. The site www.evseadapters.com has had a product on their website for a while that is a small portable fast charging converter. The idea is for like cars that have the really crummy 3kW onboard chargers to be able to use faster sources. So you can put an input like a 14-50 or a J1772 connection into it (10kW or somesuch), and it will convert and output to CHAdeMO or CCS.
But it's about $4,000!
But it's about $4,000!
Cool link, and does give representation as to size. Probably with Tesla level quantities cost could be significantly reduced, but still probably $1K or more. But then the relay on my wall in the garage was about that when I purchased it 8 years ago. I would also think size could be reduced as well... but perhaps not enough to be a viable portable unit.
Mike
Mike
Candleflame
Active Member
Tritiums 50kw chargers already only charge a Tesla with 42kw and you also loose 3.5kw per motor from the motors trying to warm the battery until the car reached around 70%. So in reality we see 35kw on those all the time.
Similar threads
- Article
