PRACTICAL GUIDES
Mortgage and solar guides
Work through the numbers behind mortgage overpayments and solar payback, then try the tools with your own assumptions.
Mortgage overpayment
How much interest can an extra monthly payment or lump sum save? A worked example, lender checks and the MortWise calculator.
Read the mortgage overpayment guide →Solar payback
The five numbers that decide payback, what a battery changes, and a worked example with RoofSolar.
Read the solar payback guide →This is general information, not financial advice. Your lender's terms, quotes, tariffs and local rules control the real outcome.