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View Full Version : Anyone adding J1772 Charging Ports to their El-Moto?



IBScootn
21 June 2012, 1745
I bought a J1772 to 240Vac adapter, now just need a light weight, small,240V, 25A charger. Not easy to find.

jonescg
23 June 2012, 1955
I'm thinking of using one of these on my eCRX (car) conversion, but since the charger on the e-moto will be off-board I won't use one on the race bike. It will need to be able to deliver ~700 V DC at 3 amps.

frodus
24 June 2012, 0834
A 240V 25A charger is going to be huge....that's 6000W.... it'll take up more space than your motor and controller.

Can your batteries handle a charge current that high? How many volts is the pack.... if its 72V, that's ~85A charge current peak.

You're likely going to need a smaller charger onboard if you want J1772.

IBScootn
24 June 2012, 1236
Originally, I looked for a typical charger, but yes they were too heavy, too large and more $ than I wanted to spend. So, current notion is rectify 240Vac to 340Vdc run thru 10.7 Ohm Ni-chrome wire unit and then thru battery pack. That generates a constant current of about 24.3A?

GBS cells rated for 32A charging. HVC is handled with Cell-log 8M and Fechter circuit.

chef
25 June 2012, 0324
The J1772 plug has split-phase 240v. Tap one of the hots (L1 or L2) and the neutral for 120v. Same deal as in household wiring from the breakers. A 120v outlet is connected to one of the two legs from the 240v going into the house.

Skeezmour
25 June 2012, 0737
The J1772 plug has split-phase 240v. Tap one of the hots (L1 or L2) and the neutral for 120v. Same deal as in household wiring from the breakers. A 120v outlet is connected to one of the two legs from the 240v going into the house.

Pretty sure this does not work. J1772 wants to see all current go through the hot lines. Otherwise it thinks there is a ground fault and will shut you down.

chef
25 June 2012, 1017
SAE J1772 specifies a Level 1 charging option but maybe most charging stations don't implement it. Here's one guy's solution (http://porsche914e.blogspot.com/2012/05/j1772-charging-upgrade.html) though it's probably too bulky for an ElMoto.

Skeezmour
25 June 2012, 1044
SAE J1772 specifies a Level 1 charging option but maybe most charging stations don't implement it. Here's one guy's solution (http://porsche914e.blogspot.com/2012/05/j1772-charging-upgrade.html) though it's probably too bulky for an ElMoto.

Be much easier to just get a charger that will work from 120v or 240v. just my $.02.

IBScootn
25 June 2012, 2221
Chef, thanks for that link. That reminded me to recheck the wiki link. I had forgotten that I could use a resistor to tell the charging Station what max current to deliver:


total resistance PP-PE 1500 Ω 680 Ω 220 Ω 100 Ω
current capacity 13 A 20 A 32 A 63 A
wire cross section 1,5*mm˛ 2,5*mm˛ 6*mm˛ 16*mm˛

Ok so let's say I tell it to deliver 240V, at 32A. Or 7680W.

Ok I rectify that to 340Vdc, subtract my 80Vdc battery pack and therefore left with 260Vdc at 29.5A of charging current though my pack. Is that correct?? If yes, then this will end up much simpler than planed.

gasfreeearth
23 July 2012, 2215
Ok so let's say I tell it to deliver 240V, at 32A. Or 7680W.
.

The chargepoint stations only can deliver a maximum of 7200 watts, and the level one 1800 watts. If it goes to 1801 it ends your charging session. I charge at about 4 kw using the J1772 and 4 Delta-Q Quick chargers that operate from 85-265vac input. and output a constant 12A each at approx 72v. The Elcon PFC chargers are pretty compact and light all things considered and are also weatherproof and have a wide voltage input range.


Here's a pic from this past friday charging in downtown Tampa, FL. I rode to the only Zero dealer in FL in Sarasota and back in one day. I went over 300 miles on the elmoto on Friday.
3444

More pics here: http://www.facebook.com/lifeoffthegrid