[Brandon Nozaki Miller]

Hi Everyone,

I am new here and wasn't sure where to post this, but I guess the vendor section seems appropriate.

I am building some prototype CCS chargers that are portable. I am planning on making them upto 100A to the battery. So, anywhere as low as 7kw upto 50kw.

What do you guys think about such a thing? Would anyone be interested in helping test these? I have already built 1 and tested it on the Energica electric motorcycle and it worked great. The company bought it in fact.

Thanks,

Brandon

 

[The Other Tom]

How do you plan to get 100A (and 50kW) to it? Most individuals (households) don't have the capability for that. I guess you could sell them to companies so their employees could charge....but normally a company would buy from an established vendor...too much liability if they went with an "unproven" source. The market is flooded with other vendors who supply, say 32-60 amp EVSE's. Just my 2 cents.

 

[XJ12]

A portable CCS. Nice. Assuming it works on single phase too? If it's portable, what kind of plug would it have or does it need to be hardwired?

Are you also working on vehicle to home?

What part of the country are you located?

 

[Brandon Nozaki Miller]

Thanks for the input.

Yep, focused on single phase for right now, but will do three phase once we get the US product all tested. Vehicle to home is something I would like to do, and should be simpler once we have the CCS set. Chademo is super simple for V2H already.

We are located in Monterey CA.

 

[Brandon Nozaki Miller]

Also, the connector would be a NEMA 14-50 for now as that is pretty ubiquitous and many companies make adapters to everything from that.

As far as at home installs go, I think many people have a 50A in the garage, or at least could get one installed at very low cost.

And for businesses, yes, definitely I would like some businesses to test. It would be really cool to get a dealer that could test as well.

 

[bro1999]

I'd be interested except I'm in MD unfortunately.

 

[The Other Tom]

Also, the connector would be a NEMA 14-50 for now as that is pretty ubiquitous and many companies make adapters to everything from that.

It's my understanding that a 14-50 outlet will supply a continuous 40 amps. So you'd be charging at 40*240= 9.6kW. I assume what you're proposing is somehow using 240V DC and 40 amps so that the Bolt can actually take 9.6 kW when using CCS. Otherwise the Bolt would be limited to 7.6 kW, and there are already many 7.6 kW on the market. Am I missing something?

 

[JaxEVLyftUber]

Single phase 50kW?


Very hard to make that happen...the voltage / current math simply fails to add up to enough to support that.


I'm a heavy daily Bolt driver - 150+ miles average, some days over 300, so I've looked at home fast(er) charging alternatives.


The only semi-viable alternative to a standard 32 Amp L2 I found is the Bosch nominal 25 kW station commonly found at Chevy Bolt dealerships. It can be had for about $9k online. Officially, it needs a 165 Amp single phase circuit, but it would probably perform well enough at 150 amps, a more commonly available rating.


Its output is limited to 65 DC Amps and 25 kW resulting in actual charge rates of 20-21 kW. Its rated efficiency is 94%.



At a typical 350 volts / 65 amps that works out to 22.7 DCkW. At 94% efficiency that means 24 AC kW. A nominal 240Vac single phase service would deliver that at 100 Amps. Applying the 80% rule for continuous loads suggests a 125 Amp circuit.


Worst case scenario of a 208 Volt circuit (two legs of 120V 3 phase) operating at sub 10% voltage (187V) works out to 133 amps...applying the 80% rule suggests 167 Amps which explains the official requirement of 165.


While I'm reasonably confident a Bosch 25 kW wallbox could be safely deployed using a 150 Amp 230-240 Volt single phase circuit, no home has that capacity available without substantial modification of its electric service.


I fail to see how / where a 50 kW single phase CCS charger could be deployed other than in a 277 / 480 V commercial scenario.

 

[JaxEVLyftUber]

Footnote - Amazon sells the Bosch 25 kW Wallbox and offers "professional" installation'' Here are some of the relevant (and contradictory) bullet points:

• Installation of provider-supplied 2-pole 50 ampere circuit breaker
• Mounting and hardwiring of electrical vehicle level 2 charger or installation of provider-supplied 240v NEMA outlet at desired location.
• Backed by Amazon's Happiness Guarantee

What's included with service

• With the 25kW SAE DC combo charger vehicles can charge up to 4 times faster than Level 2 AC

I'm not sure the "Happiness Guarantee" will do the trick here