Suggested inverter capacity
7.0 kVA
Verify manufacturer surge limitsHow this calculator helps
Estimate inverter capacity from running load, surge and headroom. 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
Inverter VA = (running watts + surge watts) ร headroom รท power factor.
Worked calculation example
A 3,000 W load plus 1,500 W surge needs additional design margin.
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.
Frequently asked questions
Is the solar inverter size free?๏ผ
Yes. SolvePilot tools are free, work in your browser, and require no account.
Does SolvePilot store my values?๏ผ
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?๏ผ
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?๏ผ
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?๏ผ
No. It is a planning estimate. Confirm tariffs with the provider and safety-critical equipment, wiring and protection with a qualified professional.