Your result
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Enter your values, then click Calculate result.How this calculator helps
Estimate monthly value from solar self-consumption and exported units. The calculation keeps important tariff, equipment and usage assumptions visible so visitors can replace defaults with their own bill, datasheet or measured values.
How to use it
- 1
Copy current values from a bill, equipment label, datasheet or measurement.
- 2
Enter realistic operating hours, rates and system losses rather than best-case marketing figures.
- 3
Use the result for comparison and obtain qualified electrical design where safety or installation is involved.
Formula and methodology
Value = self-used units × import rate + exported units × export rate.
Uses editable energy demand, sunlight, equipment and loss assumptions. It is a planning model rather than a site survey or electrical design.
Worked calculation example
300 self-used and 200 exported units are valued at their separate entered rates.
How to interpret your result
Use the import/export split to estimate bill offset under the currently applicable settlement method.
Input guide
Enter monthly import and export units from a bidirectional meter.
Use current import and export rates separately.
Model seasonal production rather than one best month.
Scenario comparison
| Scenario | What it demonstrates |
|---|---|
| 300 imported and 200 exported units | reveals the effect of unequal rates. |
| High summer export | test whether credits carry forward. |
| Low winter generation | checks annual rather than monthly economics. |
Common mistakes to avoid
- Valuing exported units at the retail import rate without confirmation.
- Ignoring fixed charges and settlement periods.
- Assuming every generated unit reaches the grid.
Verify current NEPRA rules, DISCO billing treatment and the signed interconnection agreement.
What can affect the result?
Tariffs and adjustments
Provider rates, taxes, fuel adjustments and export rules can change by billing period.
Real operating conditions
Temperature, dust, voltage, cycling, shade and user behaviour change energy results.
Safety and compatibility
Surge, cable protection, equipment limits and installation standards need professional checking.
Limits of this estimate
This planning estimate cannot reproduce every provider bill, inspect a site, certify wiring or equipment, predict weather, or replace a qualified electrical or solar design.
Sources and review information
Frequently asked questions
Is the net metering savings free?＋
Yes. SolvePilot tools are free, work in your browser, and require no account.
Does SolvePilot store my values?＋
No. Calculations run locally in your browser and the values you enter are not sent to a server.
Should I treat the result as an exact bill or quotation?＋
No. Results are informed estimates. Final charges can vary because of taxes, tariffs, lender terms, usage patterns, or provider rules.
How can I improve the accuracy?＋
Use recent values from your own bill, statement or institution, review every assumption, and confirm important results with the relevant official source.
Is this an official bill or engineering design?＋
No. It is a planning estimate. Confirm tariffs with the provider and safety-critical equipment, wiring and protection with a qualified professional.