the 80a you have is relative to your home. Mine is 100a as thats what my main fuse is rated at. It can differ per house. a 60a with load balancing turned on most likely means your assumption is correct in that the charger is protecting your main house fuse from popping. I had to fight quite hard with home to get load balancing switched on for my charger. I had to send technical drawings to Ohme for them to be satisfied before they turned it on. I charge my solar house batteries at night time at 7kw and so with the house charger at 7kw and possibly the washing machine and bread maker on, the house can be quite hungry for power so load balancing means I wake up each morning knowing that the main fuse is safe. Houses cant take an unlimited amount of power from the grid- it’s all determined by your main home fuse. I dont know if its something a qualified electrician could upgrade for you if its affecting the ability to get enough charge into the car. Possibly worth asking. Ohme cant change the load limit though. It will be set as per the physical fuse in your home. If they set it higher, you would end up blowing your main fuse.
I agree your cut-out fuse is relative to your home however, I would expect that the DNO would have upgraded the cut-out to 80A, if it was 60A.
The other thing to note without going into detail why, is EVCP’s are factory programmed at 60A, which can cause issues when for what ever reason, the installer doesn’t commission the charger by setting the correct paremeters.
Some but not all DNO’s have a written policy to allow registered electricians to remove the cut-out, to carry out work on the consumers side but, not to upgrade any of the DNO’s equipment.
A 60A cut-out typically supplies 13.8kVA or 13.8kW, which is not alot these days. Load balancing would typically kick in to limit the load at 11.04 – 12.42kW (80 – 90%)
Given @Jojoe would have stated on his survey, he had an electric shower and possibly uses electric for cooking, which would have meant the DNO carrying out a minor works order, upgrading the cut-out to 80A, which would be fitted in a 100A carrier. Which in this case I can categorically say, the installer did not commission the charger. In the same instance if Jojoe already had a 80A cut-out fitted, agan the installer did not commission the charger.
For those that are interested –
80A cut-out fuse 18.4kVA
100A cut-out fuse 28.75kVA