Savings calculator
How much is your generator really costing you?
Compare today’s fuel, maintenance and grid spend with a solar system — annual savings, five-year expenditure and indicative payback, with every assumption adjustable.
- Petrol price
- ₦950/L
- Grid tariff
- ₦220/kWh
- Small generator
- 0.8L/hr
- Maintenance
- ₦100/hr
Default assumptions used by the calculators. Change any of them to match your own receipts.
Generator vs solar
Compare your current costs with solar.
The five-year view includes the system cost upfront, annual cost increases and any battery replacement within the period.
Calculator · Generator vs solar
Compare what you spend now with a solar system
Typical at average load; check your own usage.
Example value — update to today’s pump price.
Servicing, oil, filters and repairs, spread per hour run.
Share of today’s generator and grid spend the solar system is expected to replace.
Use the sizing calculator or a quotation; the default is an example only.
Adjust advanced assumptions
Preliminary comparison
Indicative — based entirely on the values you enter.
Annual generator cost—
Annual grid cost—
Annual potential savings—
Assumptions and method
- Annual generator cost = (litres/hour × fuel price + maintenance/hour) × hours/day × days/month × 12.
- Solar operating cost = remaining generator & grid spend × (1 − solar contribution) + O&M.
- Annual savings = current annual spend − solar operating cost. Payback = system cost ÷ annual savings.
- Five-year view applies the annual cost increase to fuel and grid spend, includes the system cost upfront, and includes battery replacement only if it falls within five years.
- Excludes financing costs, generator resale value and changes in your usage.
Energy bill analysis
See your total energy spend in one place.
Combine prepaid units and generator fuel to see your blended cost per kWh and the share solar could offset.
Calculator · Energy bill analysis
See your total energy spend in one place
Prepaid units or postpaid bill.
Example Band A value — check your DisCo receipt.
Pre-set to a typical value for the property type; adjust to explore scenarios.
Preliminary analysis
Indicative — based on the figures you enter.
Monthly energy spend—
Annual energy spend—
Indicative annual savings—
Assumptions and method
- Grid energy = consumption entered, or monthly spend ÷ tariff.
- Generator energy ≈ (fuel spend ÷ fuel price) × 2 kWh/L petrol or 3 kWh/L diesel, using example fuel prices (₦950/₦1300).
- Indicative savings = total spend × solar offset. Excludes system cost, O&M and financing — see the generator comparison for payback.
Beyond the numbers
Savings you can measure.
Every MBB system includes app-based monitoring, so you can see solar generation, battery state and grid or generator use day by day.
Next step