My point was about the cost of infrastructure for the masses, not the
one or two person solution. What you did, Robert, was perfect. Instead
of fighting the system you found an easier route.
For the masses, your solution is inadequate. Let's say you have a
parking lot of 200 stalls and 100 need L1 charging. We're talking a bit
in the future when most people are driving EVs and, let's assume, want
to charge while parked at work.
For 100 L1 outlets, and forget about billing for a moment, you would
need 100 20A circuits. You need to assume they will all be active at the
same time. So that computes to 2000A at 110 volts or 1000A at 220V. Or
220kW. Not only that, but these circuits need to run quite a distance.
Perhaps you could run a few high voltage cables to various areas of the
parking and then use step down transformers to fan out to 10 or so
outlets. Still, that's a lot of 12 gauge wire and conduit. My guess is
the costs would be pretty high.
Even if you do all that, your system serves only 100 cars per day (maybe
a few more if people shuffle around at noon). Perhaps for a similar cost
(*), you could put in 4 50KW charge stations. To compare, with the 100V
system, in 8 hours you could charge a maximum of 17.6kWh, but more like
80% of that since a 20A circuit can't handle 20A continuously: 14kWh.
With a 50kW station, that 14kWh would take about 16 minutes plus a few
minutes overhead to plug in, etc, let's say 20 minutes. So, over the
course of 8 hours, it could serve about 24 cars. With 4 stations, that
would by 95 cars. Pretty close to the 100 parking lot outlets.
But, there's more. Now you have only four stations to maintain, not 100.
And those stations are good for a longer number of hours since they
would not necessarily be located in a private parking lot. So the
benefit from the producer's point of view goes up dramatically.
I'm not saying that this is a better solution than your ideas. I'm just
saying that it is probably more realistic.
(*) I am not going to try to compute the comparative costs. Too
difficult. So, if the L3 solution is realistically so much more
expensive than 100 L1s, and can't reasonably be amortized, then maybe my
argument is toast.
Peri
------ Original Message ------
From: "ROBERT via EV" <[email protected]>
To: "Seth Rothenberg" <[email protected]>; "Electric Vehicle Discussion
List" <[email protected]>
Cc:
Sent: 06-Nov-16 8:53:49 AM
Subject: Re: [EVDL] Cheap L2 charging in parking places: Bolt EV's In
Production
I agree. The same thing happened to me. I worked at a company and I
ask the manager about installing an EVSE. He said no. On the outside
of the building was an existing 30A/220VAC NEMA plug that had been used
for an air compressor until someone stole the compressor. I asked the
manager if I could use the plug for an EV. He said Yes.
________________________________
From: Seth Rothenberg <[email protected]>
Sent: Sunday, November 6, 2016 6:00 AM
To: Electric Vehicle Discussion List; ROBERT
Subject: Re: [EVDL] Cheap L2 charging in parking places: Bolt EV's In
Production
"The answer is to charge at home with a NEMA outlet "
I agree...and if needed, at work. My 24 kwh is ok for my 60 miles in 3
seasons.
My CIO said we'll put in chargers in IT just like in the hospital. Not
so fast. The Real Estate company @ IT doesn't want EVSE.
OK, so NEMA 5-15. Or 20.
A small company across the parking lot has NEMA 5 for a model S.
But my Corporate RE department won't even get a quote.
The funny thing is I got my foot in the door here through the VPN of
RE.
But he has moved 4 times in my 21 years :-) just waiting for my
Director of Marketing to convince CIO to ask RE correctly. We are in a
carpool :-)
Also waiting for the price point I can afford on a 30 kwh or 60. :-)
Until then, I volunteer for the warmest day and I preheat :-)
(We had a visitor last week with a model X, new temp tags)
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