In EU we can get max 16 Amps from "normal" 200 V socket (available everywhere). Most of aeroclub airfields had 400 V / 32 Amps. Unfortunatelly as we have to pay for installed "circuit braker size" majority of airfields changed circuit braker to 16 Amps.

My practical experience (charging on many airfields arround CR) says that 0-10 kW is OK, over 10 kW is problem (old wire installations, 10 Amps installed fuses etc.).

In year 2014 we have been using 9 x 1 kW RC model chargers in 3 big boxes transported by car

I personally beleive that in EU is possible to go up to 15-20 kW charging on every airfield without need of upgrade of existing electric net.

Our first charger (9 kW version) had weight of 3x 30 kg.

Second electric airplane has 10 kW charger (looks like suitcase) with weight of 20 kg.

As far I know Geiger Engineering offer 12 kW charger able to adapt power acording to available electric power with weight 12-15 kg (I don´t have tech. details).

So in this case is development going well forward

I agree that fast chaging is not good for battery.

For private practical flying seems to acceptable ratio starting from 1 hour charging / 1 hour flying.