12k ( the invoice doesn't break that down ). So that's an additional 4k PV with optimisers, new inverter, SE 10k battery, scaffolding, labour etc. ( no vat of course ).
Also of course I have my original PW and PV costs.
Installer told me wait for a Tesla is 18months and SE 9 months. They accept the deposit but can't guarantee the price; so if in 18 months time the price has inflated ( which we can assume it will ) then you get your deposit back. Equally, they can't guarantee stock that far in the future. Personally I'd find an installer - pay the deposit and wait ( to save!) at least you are in the very long queue.