My submeter that feeds the chargepoint did have a sim that sent usage info for gov research (now disabled) but the way mine is cabled they would have to restrict my whole house
A little known fact is most of us don't get full 240 volts nowadays, another way of stretching the supply
The reverse can be true Jon. At a boatyard in Tamworth I found my Sterling Combi (combined inverter and charger) would not accept mains. On checking incoming voltage it was found to be 261volts. The Combi had built-in protection to not accept above 258 volts! Apparently the issue was down to using an incorrect transformer tap following supply to new adjacent estate.
In 2003 the UK harmonised with Europe adopting a nominal 230 volts. This meant a drop from previous 240 volts, and maintained to - 6% to +10% of nominal. In Europe it was a rise from previous 220 volts.
Obviously heavy local loading will drag voltage down which may explain the need for EV charging power control on anything more than a 13 amp socket.
