Solar Savings Calculator
Test a simple-payback calculation with explicit assumptions. This tool does not estimate generation, recommend a system size or predict your bills.
Illustrative defaults only. The prefilled numbers are invented arithmetic inputs, not current market prices, observed customer bills or expected savings. Replace them with an itemised quote and a property-specific forecast before using the result for a decision.
Result under these assumptions
Annual bill reduction less the maintenance allowance:
€1100.00
Simple payback:
10.9 years
Formula: installed cost ÷ (annual bill before − assumed annual bill after − additional annual maintenance). The calculation is not a lifetime return forecast.
What this simple calculation leaves out
- Financing, discount rates, changes in tariffs, degradation and major equipment replacements.
- Seasonal generation, occupancy, export-credit limits and the timing of consumption.
- Any grant or tax relief that has not been confirmed for your circumstances.
Keep standing charges and remaining grid imports in the assumed post-installation bill. Do not double-count an EV or pool load already included in the before figure. Test a lower annual saving to see how sensitive payback is.
From arithmetic to a real proposal
A responsible proposal requires the roof survey, electrical design, annual demand and current tariffs. Ask LIT to explain its generation and self-consumption model before entering a forecast here.
Discuss the assumptions with LIT