One quote advertises panel capacity and a high generic yield.
THE NEWCASTLE UPON TYNE FIELD GUIDE / SOLAR PANELS
Solar panel installers in Newcastle upon Tyne
Panel capacity is not annual generation. Ask for the surveyed pitch, orientation and shade behind a Newcastle upon Tyne output estimate.

START WITH THE PROPERTY
Decode the generation number
A Newcastle upon Tyne roof proposal should identify orientation, pitch, shade and exact panel positions behind its annual estimate. Send photographs of obstructions that may not appear on an aerial image.
BEFORE YOU ACCEPT A QUOTE
Compare the same units
Kilowatts of panel capacity and kilowatt-hours of annual output describe different things. Ask for the estimate and its assumptions on the surveyed layout, then compare inverter and installation scope on that same basis.
ILLUSTRATIVE QUOTE COMPARISON
What does the annual output number actually measure?
Another models the measured pitch, orientation, shade and final layout.
Ask for forecast kilowatt-hours on the proposed roof, plus the inverter and installation scope. Installed kWp and yearly energy are not interchangeable.
ANOTHER PROJECT AT THE SAME ADDRESS?
Explore the other options in Newcastle upon Tyne.
NEXT STEP IN NEWCASTLE UPON TYNE
Read the household side too.
Once output is modelled, compare it with recent electricity use and likely export. The best roof design should make sense for the way the home consumes power.