Ahh !.. Nanotec.. good move. ( better than the Haiyin too !)
no, no Ekart here, but several ICE karts , Ebikes, and several planned Ekarts !
The problem with Ekart is finding somewhere to race as tracks & clubs are reluctant to let "unusual" kars onto their tracks ( PL insurance etc) and also the battery run time issue.
Even with a lower powered Ekart ( 10-15 kW ) you still need a large and expensive pack of lipo to have a 20 min run time,
You also need access to a decent , reliable, power supply at the track and a fast charger ( more expense), to recharge.... or another pack to swap in, ... to get you back on the track within an hour or so.
All in, not a very appealing option when a $300 ICE motor and $10 of fuel can keep me racing all day at the track without having to haul batteries, chargers , etc around.