I bought myself the new ECO charger for the Spark, works super, and easy to install, in just under 5 hours you can install it, so it is also easy to take with you,
3.5 kW install? How much per kWh of FIT do you get?
I've got a 2.8kW twin channel (E/W roof) system about 1.5 years ago. Only regret is that the install didn't come with a battery system. I find solar by itself is very hard to utilise fully.