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ProDave - You're not not bonkers or a Twatt (nice photo by the way), but you have got too much time on your hands! Why not just buy an ImmerSUN which is the solar geeks wet dream, as it powers up the immersion from the surplus PV in 1% (3W) increments up to 3kW, more details here:

Will, you're quite right about about it being best to arrange inverters separately (or at least MPPT trackers) separately for the east and west roofs. It may be at low radiation levels but the west roof will be shaded by the ridge in the morning and vice versa in the evening. I'd also agree...