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J1772 is a simple, cheap, dumb charging protocol it doesn't have instrumentation and controls.
The J1772 sends a signal to the car telling the car how big it is, say a 24 amp capacity, then a car like my old leaf will accept up to 16 amps because that's all it can handle.
Newer cars will take all 24 amps.
The J1772 units don't talk to each other. If they did it would be some proprietary control and evse system. To me that's a waste of money.
The cheapest thing would be to run 4 wire wye 240/480v on 4 gauge wire. That way it can handle 70 or 80 amps.
Let's say 70.
So if you ran 30 charging spots and ran 1 line to 10 spots that would allow for 6 or 7 amp charging on each spot.
What I would do is run 9 spots, 1 line to 3 spots and limit the charging current to 20 to 22 amps or less.
Unless this is for profit charging?
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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