Hendrix
Senior Member
- Location
- New England
Is there any truth to the rumor that they will be required in all new resi. construction in 1017
The city of Seattle is requiring the service load calculation for multi-unit residences to include an allowance for a charging station for each and every parking spot! We don't (yet) have to place a charging station at each parking spot, but we do have to include them, with no demand factor reduction, in the service calc. For the three high rise apartment/condo projects we are presently designing, that has had a huge impact on the service size.
I am curious. What number are you using for the calculated load per station?
40 amps 240 unless other info is known. 100% demand factor for first three places. This is in sec 220.57 amendment adopted in Seattle WA.
http://www.seattle.gov/dPd/cs/groups/pan/@pan/documents/web_informational/p2212547.pdf
IMHO the demand factors were decided upon before load-managed EV charging was much recognized (NEC 625.14) and should be reconsidered. Smart charging systems can limit peak demand and still get every car charged overnight.
"Big brother" gone wild !
(IMO)
The city of Seattle is requiring the service load calculation for multi-unit residences to include an allowance for a charging station for each and every parking spot! We don't (yet) have to place a charging station at each parking spot, but we do have to include them, with no demand factor reduction, in the service calc. For the three high rise apartment/condo projects we are presently designing, that has had a huge impact on the service size.
Back in the 80's, an inspector wanted a 200 amp service for a 1400 sq. ft. house that had gas: heat, water heater, range. I told him that the load calculation was under 100 amps. His reply, "what if" they want a pool in back (12 feet from back of house to property line). My reply was, maybe we need a 400 amp service "in-case" they also want a : kiln; welder; hot tub, and ----.:slaphead:
False.even though the use of electric cars actually pollute more than your standard gasoline car (in lbs of co2 expelled)
False.
Cheers, Wayne
OKLbs of co2 produced by burning 1 gallon of gas = 19.64
Lbs of co2 produced by burning Sub-bituminous coal per kilowatt hour = 2.15
I wish my Nissan Leaf could hold 41.6 kWh. The 3.6 kW charger takes 8 hours to charge a brand new 24 kWh capacity Nissan Leaf to full from empty, and above 80% the charge rate starts to drop below 3.6 kW.Nissan Leaf charger draws 5.2 KW and takes 8 hours to charge. That's 41.6 kWh.
OK
I wish my Nissan Leaf could hold 41.6 kWh. The 3.6 kW charger takes 8 hours to charge a brand new 24 kWh capacity Nissan Leaf to full from empty, and above 80% the charge rate starts to drop below 3.6 kW.
Simpler math is that a good driver can get 4.0 mi/kWh, and the charger is 90% efficient, so receptacle to wheels the efficiency is about 3.6 mi/kWh. If that kWh came 100% from subbituminous coal that would be 1.67 mi/lb CO2.
So a gas car that gets 33 mpg matches in mi/lb CO2 a Nissan Leaf that is run 100% from subbituminous coal. In reality, no grid is 100% subbituminous coal, that is the worst case for CO2 pollution from electricity.
The upshot is that almost always the Nissan Leaf will pollute less CO2 per mile than a gasoline car. Of course, we have neglected several things, like the CO2 emissions from drilling for oil and refining the gasoline, and the CO2 emissions from mining and transporting coal, and transmission losses.
In any event, electric vehicles make it much easier to displace the CO2 pollution from driving by switching to a low carbon electricity source. Coal is on the way out.
Cheers, Wayne