12A at 240V is better than 10A at 240V. In Europe EVSE is limited to 10A over household plug.
Though it should be up to 13Amps constant and 16Amp maximum.
It was limited to 10A because people were dumb enough to plug trickle charger to random
not dedicated lines and multisocket extension cords. So adding a incandescent bulb was already too much
When I bought my Leaf I had to charge it somehow. So i bought dedicated 160 foot extension and plugged
it into dedicated socket. Used the trickle charger. Then noticed that the cable was too warm, especially 10 feet
that were left on the drum. So after small research I concluded that cord was weak. 1,5mm² (16AWG) rated.
Its ok to use 16AWG for 16 amps but only unrolled, short and not covered
. Way too dangerous for grannys.
Also voltage drop wastes energy. I lost something like 15% on that extension alone
This is why all Level1 chargers should be connected to 14AWG wired dedicated plug. Including this modified EVSE.
Circuit breaker dedicated for trickle charger should be 15A in US and 10A in EU for maximum safety, including this mod.