One uses a map estimate of pitch and a stock shade factor.
THE SHEFFIELD FIELD GUIDE / SOLAR PANELS
Solar panel installers in Sheffield
Pitch and orientation belong in the generation model. Ask to see them on the measured drawing for your Sheffield roof.
START WITH THE PROPERTY
Use the measured roof pitch
For a Sheffield roof with an unusual slope or changing orientation, request a surveyed plan instead of a capacity estimate from map imagery. Roof photographs help identify the faces worth modelling.
BEFORE YOU ACCEPT A QUOTE
Trace every output assumption
The annual estimate should identify the proposed planes, orientation and shading allowance. If two quotes differ sharply, compare those assumptions before assuming one installer has better equipment.
ILLUSTRATIVE QUOTE COMPARISON
Are two output forecasts based on the same roof?
Another measures the roof and separates the output of its different faces.
THE DECISION
Compare geometry and shade inputs before comparing panel brands. A higher annual figure can simply be a more optimistic model.
ANOTHER PROJECT AT THE SAME ADDRESS?
Explore the other options in Sheffield.
NEXT STEP IN SHEFFIELD
Check the electrical plan downstairs.
Once pitch and layout are measured, find where the inverter, meter connection and cables can go. Those choices affect the finished installation and price.