HalfAJob

I've been through this exact decision myself when I set up my narrowboat system, though I went smaller initially at 3kW.

The thermal story's interesting—mine sits in the narrowboat cabin where ambient swings wildly, and it just doesn't stress.

I'll be honest, this is what killed the idea for me on the narrowboat. Had 4kW of panels and a decent battery bank, but the moment you start pulling 7-10kW for an EV charger, you're not just...

@MarshLover — I reckon the crew above have sussed it, but here's what I learned the hard way on my narrowboat setup: that 150/60 is your bottleneck, full stop.

You lot are dancing round the real question. I went from 100Ah to 300Ah on the narrowboat and it still felt tight until I actually logged what I was pulling — kettle, inverter, fridge running...