Sorry .... yes I missed this.
No worries!
A 1MWh battery and solar panels must have added significantly to the cost above that if the grid could supply say 1.5MW 24/7/52 if the demand was there.
Yes, it will have cost more to install but I think the only other option was to continue with the two existing 60KW chargers.
Six high power chargers at each service station is far too few to encourage anyone buying / taking on a new lease now to choose a pure EV if they regularly travel long distance on motorways.
Yes 6 will definitely be too few going forwards but this is 2023, not 2030 or 2035 or 2040. Norway are 5 years ahead of us and are on target to ban sale of non-hybrid ICE cars from 2025, with EV only sales currently at 80%+. However, the total Norwegian EV fleet is still only around 30% of the total. So you don’t currently need to have millions of chargers everywhere as they would simply be a waste of investment. The other issue is that
most people simply don’t need to use public charging very often (I’ve had my EV for a few months and done it twice). Yes there are some people that do a lot of motorway miles all day everyday but that is a very small % of folk. And if they are in that situation I would recommend getting a Tesla, which has a great private network, and if you buy an older one will be free!
While true now if except for small cars i.e. anything Astra, Golf etc size and larger the standard battery becomes 75+kWh capacity to 80% charge in under 30 minutes a charge rate of 150kW or close to would be required. Add in transit size vans and minibuses with a battery capacity of 100kWh+ then a charge rate of 200kW or close to would be required.
75kw+ is a large battery for Astras/Golf size cars. My Cupra Born which is this size has a 58KWh battery which I easily get 180 mile motorway range from. This is three hours driving!
Most standard new ultrafast chargers (including those at the aforementioned mentioned Cornwall Services) run by the major players (Gridserve, Tesla, Ionity, etc) are already in excess of 200KW so a bit of balancing really isn’t the end of the world, especially as I say no cars on the road today can handle the top charging speeds offered by the chargers.
However,
most importantly you would never ever charge from 0-100% (which you are basing your calculations on) at a motorway because of the cost and time (and the fact if you were already on 0% you would have really pushed it). You would charge up to the amount to safely reach your destination (if you charge beyond this point you’re chucking money away), or 80% because the speed of charging will slow significantly after this point and it is quicker to just move on to the next fast charger 150miles down the road rather than trying to eek out the last few %.