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Topic Title: FREE ELECTRIC CAR CHARGING.
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Created On: 04 October 2017 10:49 AM
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 04 October 2017 10:49 AM
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Zoomup

Posts: 3276
Joined: 20 February 2014

A certain energy company is offering free electric car charging if the owners allow the exporting of the car's battery stored energy back into the grid or house at times of peak demand.

This should not flatten the battery as the car owner can request limits to the discharge of the car's battery.

This will involve "bi-directional chargers." A trial of this scheme has been running in Denmark. National Grid has said that such smart charging will be crucial to ensure that electric vehicles do not place a significant extra strain on the U.K.s energy system.

Apparently if all U.K. cars were electric they cold provide a "virtual power plant of up to 200 gigaWatts, several times the peak requirement."

Z.
 04 October 2017 11:08 AM
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pww235

Posts: 181
Joined: 03 April 2014

But what is the more likely value if say, 75% of owners put the most stringent discharge limit on their installation? With this kind of proposal, it really needs to be worst case figures that are used rather than the optimistic best case.
 04 October 2017 11:27 AM
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AJJewsbury

Posts: 15838
Joined: 13 August 2003

But what is the more likely value if say, 75% of owners put the most stringent discharge limit on their installation? With this kind of proposal, it really needs to be worst case figures that are used rather than the optimistic best case.

It would still be 200GW (or whatever) - as they could tap into the first 25% all at the same time. The more significant question is low long it could be produced for (i.e. how many GWh would be available).
- Andy.
 04 October 2017 11:31 AM
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pww235

Posts: 181
Joined: 03 April 2014

Touché. That was actually my point but my words aren't working today.
 05 October 2017 10:32 AM
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CMK3PD

Posts: 65
Joined: 23 September 2016

When you think about it, the problem actually relates to car charging. If we ignore car charging the grid has principally enough capacity to run the current peaks.
The issue starts when we plug in cars at 5pm and all want to charge them at the same time, pushing the peak to above grid capacity. I know about V2G trials, but surely the simple solution is to sort out the car charge time away from peak usage. Rather than incur all of the losses involved in AC-DC-AC transfer to grid, just to then charge another battery in another car, who has either not installed a V2G charger or has enough money to pay the premium charge costs that will no doubt be applied.

To me we need to look at a more joined up solution, solar cells charging house battery during the day, come in at night and the main car charge is home battery to car battery resulting in no ACDC conversion losses at that point. The home battery could also be used as a grid fallback if it is struggling with peaks. When the home battery is run down, an auto switch to grid supply comes in, but that would be after the 5~7 peak has gone and would not jeopardise the grid capacity.
 07 October 2017 08:46 AM
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Zoomup

Posts: 3276
Joined: 20 February 2014

Surely the increased use of the electric vehicle's batteries will reduce their life. If just using them for vehicle traction they might last x tears, but with additional storage and export use they may only last x X 0.75 years. More cycling less life.

Z.
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