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RATIOXA ENERGY · Decision tool

Does solar pay?

Model self-consumption, export, degradation, price changes, NPV, IRR and payback.

10 inputsDetailed comparisonSaved locally on this device.

Your assumptions

Does the discounted benefit exceed the investment?

● Saved locally on this device.
Example scenario
Start from
€
Example assumption
kWh
Example assumption
%
Example assumption
€/kWh
Example assumption
€/kWh
Example assumption
DECISION PACK

Does solar pay?

Created: 18/08/2026 · solar@5.0

Important: Actual yield and consumption may differ from the assumptions.

Result · Why?

Discounted benefit leads by €5,649

Self-consumption is usually worth more than export; the discount rate values timing.

Difference€5,649
Net present value€5,649
Internal rate of return6.63%

Discounted benefit

Self-consumption benefit€32,157
Export revenue€11,024
Operating cost€4,500

Investment

Investment€18,000

Break-even

Discounted payback

Point at which discounted cash flows cover the investment.

17.24 years

Result robustness

Robust within tested range

The leading option remains ahead across the automatic ±10% input tests.

  1. First-year productionApprox. change in result: €2,646
  2. Grid electricity priceApprox. change in result: €1,950
  3. Analysis periodApprox. change in result: €1,878

RATIOXA STORY

Your Decision Story

  1. 1

    Discounted benefit: €23,649

  2. 2

    Investment: €18,000

  3. 3

    Discounted benefit leads in the base case.

Calculation Health

Quick estimate

Add more of your own values to strengthen the scenario.

  • + Net investment
  • + First-year production
  • + Self-consumption share

RATIOXA IMPACT MAP

What matters most?

First-year production€2,646
Grid electricity price€1,950
Analysis period€1,878
Net investment€1,800
Self-consumption share€1,576
Discount rate€1,084
Higher impact →
×

Key insight

Your decision is most vulnerable to changes in First-year production.

Self-consumption is usually worth more than export; the discount rate values timing.

SCENARIO RANGE · DETERMINISTIC

Stress-test this decision

Stable
Base caseDiscounted benefit€5,649
First-year production · −Discounted benefit€3,003 · Winner holds
Grid electricity price · −Discounted benefit€3,699 · Winner holds
Analysis period · +Discounted benefit€7,526 · Winner holds
Net investment · +Discounted benefit€3,849 · Winner holds

RATIOXA ×

Discounted payback

Point at which discounted cash flows cover the investment.

Crossover17.24

Compare everything

Discounted benefitInvestment
Result value€23,649€18,000
Difference€5,649—
Self-consumption benefit€32,157€18,000
Export revenue€11,024—
Operating cost€4,500—

PRACTICAL NEXT STEP

Before you decide

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SCENARIO RANGE

Conservative · Base · Optimistic

Locked assumptions
CONSERVATIVEDiscounted benefit€7,449
BASEDiscounted benefit€5,649
OPTIMISTICDiscounted benefit€3,849

TRUST CHECK

Fair Comparison Check

✓
The comparison is structurally fair
  • ✓Same comparison horizon
  • ✓Comparable cash flows
  • ✓Residual values and balances included
  • ✓Inputs are internally consistent
Not included in the model
  • Contract terms, eligibility and taxes outside the entered values
  • Personal risk tolerance and liquidity needs
  • Professional legal, tax, finance or energy advice

Assumption freshness

Decision readiness

○
10 core inputs still use example values

0/10 inputs replaced with your own or transferred values · 3 real-world details still worth checking

  • ○ Check the site yield forecast
  • ○ Use realistic self-consumption
  • ○ Include maintenance and degradation

TRANSPARENT MATH

Formula inspector

Calculation steps

  1. Self-consumption avoids the entered grid price; exports earn the entered tariff.
  2. NPV discounts each annual cash flow; IRR is solved numerically without inventing a result.
  3. Degradation and electricity price changes affect each following annual cash flow.

Substitution with your values

Sum of displayed components A = 32157.01 + 11024.19 + 4500.00 = 47681.20Sum of displayed components B = 18000.00 = 18000.00Total: 23648.95 / 18000.00

Important: Actual yield and consumption may differ from the assumptions.

WHAT-IF

Snapshot current scenario

IMPORTANT DOCUMENTS

Prepare the decision

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QUESTIONS TO ASK

Ask before you sign

  1. Which performance is guaranteed?
  2. Which maintenance and extra costs apply?
  3. Which assumptions does the economics calculation use?

EXTERNAL OFFERS · SEPARATE FROM THE CALCULATION

Explore real offers

The independent RATIOXA result above never changes based on these links.

check24.deCHECK24 Energie

Compare current external electricity tariffs.

Open portal ↗verivox.deVerivox Energie

Review electricity tariffs and contract details.

Open portal ↗

External websites are independent from RATIOXA. No commercial partnership is implied.

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