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diy solar

diy solar

DC solar directly to EV (no AC!)

I was wondering yesterday actually what would block those 1-2 Chinese companies selling not too expensive CCS chargers in the 10-100kw range from just modularizing their platform more or accepting custom order for something that talks CCS and allows you to hook into the DC side.

So that we can get a cheap dev modulesz

Or do those “expensive” CCS dev modules provide a lot more nice things and safety than back ass converting a more fixed function implementation into a dev module?

I don’t think they’re expensive from the POV of a company making a product and needing one for their engineers, but it’s more than I’m willing to spend for DIY on my weekend time
 
I revive this thread because I can't believe we still can't have a product to directly charge our EV from solar.

And I realized that the 425$ Meanwell CSP-3000-400 can act at a 3 kW DC-DC with 400V output.
Input is 254 - 370Vdc, so 8 panels (+/-1 based on cells qty) will feed this.

Now, the last puzzle piece, is there CCS controller for the DIY world available now?
 
yabert said:
I revive this thread because I can't believe we still can't have a product to directly charge our EV from solar.

And I realized that the 425$ Meanwell CSP-3000-400 can act at a 3 kW DC-DC with 400V output.
Input is 254 - 370Vdc, so 8 panels (+/-1 based on cells qty) will feed this.

Now, the last puzzle piece, is there CCS controller for the DIY world available now?
Click to expand...
Are you sure that meanwell allows DC input? It says AC everywhere except that small blurb about DC.

A agree it's insane there isn't a simple system. I'm surprised there isn't a huge market for this as someone could build a ground array of panels just to charge their car. Maybe an optional 10kwh battery add-on to charge at night. Would be a great starter system for someone like for a barn
 
summit said:
Maxwell vehicle has developed one
Click to expand...
Holy cow 😲😬
Awesome and thanks to share, but I think you miss the main point... there is nothing to develop, AC charger can take DC.
Seriously, I know this guy of the video and ask him details.
Man, if my Bolt can take 6-7 kW of solar by his AC charge port 😳😁

 
I have a 2013 Leaf with the small 120/240v OEM charger. I would not be surprised if it could do the same thing, but it checks for ground faults and would not work without the ground pin connected. His did. I have the charger running from a 230v European style inverter and the charger would not work at all until I connected the "neutral" end of the inverter output to the household ground. It didn't like the totally floating ac input. Anyhow, if charging form PV, the charging would probably drop out when a cloud went by. You would have to go out and re-initiate it every time.
 
yabert said:
Same for my GM EVSE. Fault when connected to 224Vdc... I had to try 😄
Click to expand...
did you take the next step to provide the neutral-ground bond and able to charge your Vanabolt at 224vdc ? the interesting thing is the older GM EVSE, mine are circa 2017, can run on 240vac providing 3kw charging. In the 240vac configuration, the "neutral" becomes a hot L1 (or L2). Not sure how the GM-EVSE checks for the neutral-ground bond. I have always been running with ground connected.

Thanks for sharing DoctorBass link, so many amazing vids. Am particular intrigued with his experiment of extending the range on his Zero e-motorcycle via the J1772 charge port.
 
summit said:
the older GM EVSE, mine are circa 2017, can run on 240vac providing 3kw charging.
Click to expand...
You mean this one (remark the ''Nema 14-50'' adapter) 😉
I've fool them once on 120V with neutral to ground, but I'm not sure how to fool them with 224Vdc.

1742488658206.png
 
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yabert said:
You mean this one 😉
I've fool them once on 120V with neutral to ground, but I'm not sure how to fool them with 224Vdc.
Click to expand...
no fooling needed on 220vac, and by extension probably not with 224vdc neither
 
yabert said:
I'm not sure how to fool them with 224Vdc.
Click to expand...
Without knowing how it checks the ground, have you tried a 1M resistor to each leg (DC+ and DC-) and an imaginary ground pin? It might look enough like ground for the charger/EVSE. 1 M might be too high, but stops any real current loss through the 2M
 
get DoctorBass to try supplying 240vdc to the J1772 two pins on your Vanabolt as he did on his Volt. Or have you tried it ?
 
summit said:
get DoctorBass to try supplying 240vdc to the J1772 two pins on your Vanabolt
Click to expand...
He isn't exactly my neighbor. He live far from home and I would like to test this at home with my panels.

Really, I don't understand how EVSE ground is verify at 240V. Those can work at 240V without neutral (Nema 6-50 or 14-50 without neutral pin).
My GM 120 or 240V EVSE only have 3 pins and can work with 120V hot/neutral + ground or with 120V hot/ neutral + neutral.
It also work with 240V hot/hot + ground.
Well with all this, any tips to allow working with ''hot/hot + no ground'' aka solar panels?
 
Well, both the Tesla and the GM EVSE I have in hand work 120/240V.
I bet I have to found any EVSE who can work at 240V without ground.
 
There's a chance the EVSE is just checking for some potential (voltage difference) between the hot pins and ground. Adding a voltage divider between the hots and ground might truck the EVSE into being happy with a DC supply.

DC+ --- 1M resistor --- ground pin --- 1M resistor --- DC-
 
Throw a pair of 45k resistors at it. It would flow 2 mA or 0.22 watts in each resistor. If they are 1/4 watt resistors they'll probably get got quick and might die.

Maybe run 2 in series in each side. That would drop the current quite a bit and mean you aren't running those $0.002 resistors for everything they're worth 😂

DC+ ---45k ---45k --- ground pin ---45k ---45k --- DC-

That is, if you have 4 of them

Reading is hard...
See jorby's post below.
 
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