Cohousing-L Mailing List: Re: more on EV charging stations from River Song

[Philip Semanchuk (philip]

> On Jan 23, 2022, at 7:57 PM, Jim Bronson <jimbronsonashland [at] gmail.com> 
> wrote:
> 
> *To get an initial idea of costs for networked charging,* I talked with the
> largest network EV charging company (EV Connect - John Guitierrez) and
> heard the following:
> 
> 5 EV stations – good number initially for 28 households
> 
> Choose locations to minimize conduit runs
> 
> Level 2 stations – 240 v with 40 amp circuit


Hi Jim,
Congrats on considering EV charging stations in your building plan. IMHO five 
40A stations sounds like a lot for 28 households. 

For context, we’re retrofitting our 46-household coho (about 70 vehicles) with 
EVSEs, and we think we’ll be comfortable with just two charging stations for 
5-10 years, maybe longer. We’re planning to install 48A stations which will 
charge 20% faster than the 40A stations you have planned, so that makes it 
easier for us to support more vehicle-miles with fewer charging stations. 

Your planned 40A chargers will provide ~9.2kW, so an overnight charge (say 12 
hours) will supply 100 - 110 kWh. That’s nearly twice the capacity of the 
battery on my 2020 Chevy Bolt which has a range of 250 miles. With five 
charging stations, over the course of a month you’ll be able to charge 30 * 5 = 
150 long range EVs from zero to full, just considering overnight charges. (In 
other words, we’re completely ignoring the benefits of daytime charging.) Even 
that scenario allows for 5+ charges per household per month. That many charges 
on a Bolt would allow each household to drive 5 * 250 = 1,250 miles every month 
if they do 100% of their charging at home. 

I have the spreadsheet that we used to estimate how many EVSEs our coho would 
benefit from. If there's interest I'll clean it up and make a publicly 
shareable version. 

Cheers
Philip