My 6a charger will give 250wh in 60 mins, so almost 40% charge. And yes, we have done this already and it does make a difference.
Can also easily charge 2 ebikes at once. I’ve used it camping to charge phones, do some work on my laptop whilst charging, took it to the alps for 6 days and up 2 flights of stairs (the room only had one plug!) and charged everything off it.
It’s definitely not a product for everyone but I’ve been using it a hell of a lot.
I can drive to a bike location, camp in the van ride all day and charge overnight. Loads of options.
I thought the standard wall charger for my 48V system emtb was fast by charging 80% (of 672Wh) in just 2 hours. That’s about the same giving 269Wh in 60 mins.