Interesting points, thanks. V2G is something that I would like to understand better:
I hadn't thought of PoD in terms of car charging. If I need my car charged by, say, 6AM tomorrow morning the start may well be delayed until 1AM ... and it will still be fully charged in good time.
But what about evening peak household usage? (The example given here in UK is when the adverts start during a popular Soap and 90% of the population gets up and puts the kettle on!). Clearly a 5 or 10 minute "spike" would allow PoD to turn off Fridge / Freezer / AirCon . etc. but what about the next level of "high usage", rather than "spike", that goes on for, say, several hours during the evening? I can see that many/most?? EV recharging could be delayed, but Fridge/AirCon etc. can't be off for several hours, and I thought the promise of V2G was to cover that usage - i.e. avoid requiring (maybe additional) power stations that can provide power over a short period when the sun isn't shining or the wind is blowing ... e.g. when folk get home on a winter's evening and started using Electricity for heating, cooking, lighting, etc.
I agree its an order of magnitude bigger problem to solve, but the "promise", to me, seems to be avoiding building polluting power stations and shifting power-consumption timings. If every car in the land has a battery can't we avoid having a duplicate second set of static storage batteries at the Utility companies?
Fridge can be PoD for 30 minutes, freezer for 2-3 hours.
There are only few high power appliances at homes. Washers/dryers, heating air, heating water, EV's. All those can be planned ahead/delayed even without PoD, though with lots of manual labor. Many devices nowadays have timers. Even kettles.
V2G gives extremely little help few minutes per day. It's 2017. V2G is non-existent. And grid is fine. In 2019, if there will be no V2G, grid will be still fine. Same in 2022. PoD, while costing nothing (compared to V2G - thousands per house), helps considerably. With years, kettle, washing and heating demand will not rise (actually it is slowly going down, LEDs, heat pumps etc). But EV charging will spike dramatically.
Therefore there is no need to deal with things that work and deal with new load that actually might strain the system. The bigger the overall daily load, the smaller part will the kettle play in the big picture. We definitely need to add some power production when EV's take over, even though most of the charging will happen at night and possibly even with grid PoD instructions.
V2G will not reduce annual energy production, actually, it will make it worse.
Idea is not to grind down the peaks but to fill the gaps. PoD does the job.
It's pointless to remove the peaking moments as we might find ourselves drawing more energy during the night.
This is UK graph. What will happen if we replace all vehicles with electric ones.
30 million vehicles, all juicing up at modest 3kW rate, will add draw of 90GW. On average each vehicle will require 2-5 hours of charge time per 24h. We have around 6 hours of off peak period. So all odd EV-s charge first then all even charge later. This will add only 45GW load during the whole night.
We still can't fit on this graph.
Like I said, not possible to shave off any peaks.
