Wow - very impressive. Use some technical terms that have zero relevance, and the forum community trembles at their own ignorance.Belgian1979 wrote: ↑Sat Jan 20, 2024 7:34 amA residential grid is made up of 25 mm2 cables supplying on average 100 houses. Considering the cos phi it means 95A is available in that 3f grid. Making for a MAXIMUM DAILY supply of ca. 1600 kWh (P= sqrt 3*400*95) or 16 kWh per home.
With an electricity consumption in a car of 20 kWh per 100 km, this can hardly be considered comfortable if you also want the lights to burn, to make dinner etc.
1. First problem is that cable CSA limits peak current yet you conclude with a per-day average. Did you know that residential evening peak consumption is about 50% higher than average consumption? And that nighttime minimum consumption (about 6 hours from 12 - 6) is 30 or 40% lower than average? The cables have to be sized for the evening peak - so even if there is zero margin, the average household consumption could still increase by 50% without upgrading those cables.
2. You have jumped ahead by 30 years to 100% EV where every one of those 100 households is charging an EV. Nobody made any claims about today's grid sustaining the demands of 30 years into the future.
3. Although you mentioned energy consumption per kilometer, you didn't convert that to a grid load. In Australia, the average household drives a total of 50 km per day which converts to 10 kW.hr per day of charging required.
So if ALL charging is done at home (no use of public or workplace chargers) and 33% of all vehicles are electric, those 100 homes will need another 330 kWh or 20% more than the 1600 kWh you state. If this was done between 12 and 6 am, the power during those hours would still be lower than the evening peak.
100 homes:
1600 kWh/24h = 67kW avg x 1.5 = 100 kW peak
67 x 0.6 . . . . . . . . . . . . . . . . = 40kW night minimum
33 EV's x 10 kWhr /6hr . . . . . . .= 55 kW extra
40 + 55 . . . . . . . . . . . . . . . . . = 95 kW Total power with charging
Of course 33% EV is going to take several years AND not all charging is done at home.
No but it doesn't need to until the demand increases. I said previously that the US grid for example has previously increased capacity at 4% per year for 40 years. (Thats more than 20% in 5 years - 48% in 10 years - 119% in 20 years)Do you really think the grid upstream has more capacity to spare?