If I'm doing some surgical strike 'bloke shopping' then I wouldn't bother plugging in as I'm not likely to be in store more than 15 minutes. But when we do a Sainsbury's shop we have to drive 16 miles and the free 3kW post is sufficient to recoup the mileage we used to get there during a regular shopping trip, more if we have lunch in one of the food outlets. I do usually plug in at our local Waitrose 7kW even though we only spend half an hour there, simply to justify my PolarPlus subscription!Why?
I never use slow chargers at the supermarket.
Not only are the chargers as far away as possible from the store I'm lucky if I get say 1kWh of charge.
Many supermarkets also have time restrictions often enforced by the likes Parking Eye with severe penalties.
Perhaps it's just me but the supermarket is for brief stops not a destination for several hours.
Personally I think slow chargers are a complete waste of time except for workplace, P&Rs and home. Would also be nice if out of town cinemas etc had some. Certainly in Scotland the proposal is to change stay times at destination chargers from 12 to 4 hours reducing their usefulness even further. So why are they putting in banks of slow chargers that are neither destinations or places anybody goes is beyond me. Just budgets getting spent...
Like Tesla we need lot's of banks of rapids that are quick and easy to access and use. Wonder where they got that idea, petrol stations, hmm...