Productivity
Build a solar proposal
Production, savings and payback, with the assumptions on the page.
Fill it in
Roof, orientation, shading and where it is.
Annual kWh, or a monthly bill.
An optimistic proposal is a complaint in year two.
Your prompt
Build a proposal for this home. [the property] Usage: [your their usage] Estimate production from the actual orientation, tilt and shading, and say what irradiance figures you used. A proposal built on a national average is wrong by a lot in both directions and cannot be defended when the first year comes in low. Be conservative. An optimistic proposal wins the sale and produces a complaint in year two, and the industry's reputation problem is entirely made of these. Model the savings against their actual tariff, including what happens to the export rate. Self-consumption is where the value is, and it depends on when they use power. Show payback with the assumptions visible, and what a 20% shortfall would do.
Use Build a solar proposalOpens with everything above already filled in.
Why this works
An optimistic proposal wins the sale and produces a complaint in year two. This estimates from actual orientation and shading rather than a national average, models savings against the real tariff, and shows what a 20% shortfall would do.