link1896
Mr Greenfield
Indeed the current electricity distribution grid cannot support mass EV charging when we insist a 4 door, 5 seat car that consumes 125-200 watt hours per km is what we actually need to transition to on mass.
If we limit charging power to 2.2kW per household for our Tesla, that’s ~12km of car range per hour of battery changing.
8 hours charge gets us 96km of range, for one car per household. 8 x 2.2 = 17.6kWh.
I know how the energy market will solve this if we give them the opportunity. Load control at the residential DB with the retailers running rolling auctions for the nightly rate for the customer to commit to. Want 11kw for 8 hours (88kwh) at $0.75 per kWh. Let’s say energy costs go bat shit crazy. $0.75 a kWh in metro melb/Syd/Bris.
I’ve been involved with cinema energy efficiency studies where calculated power usage gets real tricky as per the docklands example. Supply authorities tell the consultant “max supply current is xxxx, if you want more it’s xxxxxx and xxx years before we can upgrade”. Pretty funny when someone signs a commercial lease agreement for 10 years THEN finds out their maximum available power is 60% of expected. Distribution capacity issues are costly at a micro level. Nation wide? Can’t see it being resolved. Partially with a hybrid approach? Sure. Yes.
These basic car charging numbers show how tricky the numbers get if we go like for like with electrochemically powered transport replacements for the existing fleet . That’s not an option for all of the people from a grid capacity pov. Residential PV and energy storage demands are going to be insane to meet demand.
A pedal assist ebike MTB uses 10-15 watt hours of energy per kilometre. Remember our car was 125-200 watt hours per km. How many cars on the road have one occupant?
My electronic mountain bike uses about 13 watt hours per km on river side flat single track.
1000 watt hour battery
Gives us a 66km range on single track dirt on flat ground if we use 15 watts per km. Take it up to 20 watts per km so we are at a convenient 1/10th the energy consumption of the car.
We don’t have active liquid cooling on our bicycles lithium ion cells like these fancy Tesla’s do so we are going to charge our bicycle battery cells at 0.5 times rated cell capacity like Samsung and Panasonic tell us we should. We don’t like the red dragon within when we ignore them.
0.5kw for two hours to charge. 1kWh
.
$0.75 to charge our ebike for a 66km round trip.
Cars are not the sole answer. Pedal assist gets the owner moving, and uses a considerably smaller amount of energy.
If we limit charging power to 2.2kW per household for our Tesla, that’s ~12km of car range per hour of battery changing.
8 hours charge gets us 96km of range, for one car per household. 8 x 2.2 = 17.6kWh.
I know how the energy market will solve this if we give them the opportunity. Load control at the residential DB with the retailers running rolling auctions for the nightly rate for the customer to commit to. Want 11kw for 8 hours (88kwh) at $0.75 per kWh. Let’s say energy costs go bat shit crazy. $0.75 a kWh in metro melb/Syd/Bris.
I’ve been involved with cinema energy efficiency studies where calculated power usage gets real tricky as per the docklands example. Supply authorities tell the consultant “max supply current is xxxx, if you want more it’s xxxxxx and xxx years before we can upgrade”. Pretty funny when someone signs a commercial lease agreement for 10 years THEN finds out their maximum available power is 60% of expected. Distribution capacity issues are costly at a micro level. Nation wide? Can’t see it being resolved. Partially with a hybrid approach? Sure. Yes.
These basic car charging numbers show how tricky the numbers get if we go like for like with electrochemically powered transport replacements for the existing fleet . That’s not an option for all of the people from a grid capacity pov. Residential PV and energy storage demands are going to be insane to meet demand.
A pedal assist ebike MTB uses 10-15 watt hours of energy per kilometre. Remember our car was 125-200 watt hours per km. How many cars on the road have one occupant?
My electronic mountain bike uses about 13 watt hours per km on river side flat single track.
1000 watt hour battery
Gives us a 66km range on single track dirt on flat ground if we use 15 watts per km. Take it up to 20 watts per km so we are at a convenient 1/10th the energy consumption of the car.
We don’t have active liquid cooling on our bicycles lithium ion cells like these fancy Tesla’s do so we are going to charge our bicycle battery cells at 0.5 times rated cell capacity like Samsung and Panasonic tell us we should. We don’t like the red dragon within when we ignore them.
0.5kw for two hours to charge. 1kWh
.
$0.75 to charge our ebike for a 66km round trip.
Cars are not the sole answer. Pedal assist gets the owner moving, and uses a considerably smaller amount of energy.