I showed my roof earlier, here it is again. The supplier recommends six panels on the garage and twelve on the main roof.
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It's always seemed to me to be a bit of a sin not to put solar panels on that.
Simplistically, I look at the current recommendation for my monthly electricity DD, which is £146. Not actually a huge amount in the grand scheme of things. (I'm actually paying a bit less at the moment but the Scottish Power app is recommending an increase, possibly it's realised I'm consuming a bit more than I was.)
The entire quote (including solar panels, battery and Zappi) is £13,710. If I divide the quote by the monthly DD, then that makes 7 years 10 months worth of monthly payments. Obviously not accounting for inflation or lost interest and so on. My supplier is estimating 6-7 years of payback time. This suggests that over the year I'm not simply paying nothing for my electricity, I'm making a little bit.
I appreciate this is highly simplistic, but is this actually possible? And yet people who have the systems seem to be quite satisfied with the return they're getting, on the whole. And my electricity consumption is on the high side of average, so that should actually be advantageous.