Step 1
Your current energy costs
£
/mo
p
Step 2
Location & roof orientation
°
South — optimal generation
Step 3
System size & cost
4 kWp
2 kWp13 kWp
£
Step 4 — Optional
Battery storage
£
kWh
Annual savings
£—
bill reduction + export
Payback period
— yrs
break-even point
25-year profit
£—
after all costs
Payback timeline
Loading…
Install
25 years
Full calculation breakdown
Estimated annual generation—
Units self-consumed—
Units exported to grid—
Bill reduction (import saving)—
SEG export income (15p/kWh)—
Total annual benefit—
Total system cost—
Figures are estimates based on typical UK conditions. Generation uses MCS-based irradiance for your region. Electricity tariff inflation is not modelled. SEG rate assumed at 15p/kWh — check your supplier's current offer for accuracy.
Assumptions used in this calculation
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