Your result
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Enter your values, then click Calculate result.How this calculator helps
Check the basic electrical result of wiring identical solar panels into series strings and parallel branches. Series connections add voltage, while equal parallel strings add current; the page clearly warns that inverter input limits still require datasheet verification.
How to use it
- 1
Copy one identical panel's voltage and current ratings from its datasheet.
- 2
Enter panels in each series string and the number of equal parallel strings.
- 3
Compare cold-corrected voltage and current with every inverter or controller input limit.
Formula and methodology
Array voltage = panel voltage × panels per series string. Array current = panel current × parallel strings. Total panels = series count × parallel count.
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
Panels rated at 49 V and 11 A arranged as six in series and two equal parallel strings produce approximately 294 V, 22 A and 12 total panels.
How to interpret your result
Calculate solar-array voltage, current and panel count from a proposed series-parallel layout. Read the main result together with the supporting values rather than treating one number as a guarantee. The disclosed method is: Array voltage = panel voltage × panels per series string. Array current = panel current × parallel strings. Total panels = series count × parallel count.
Input guide
Copy one identical panel's voltage and current ratings from its datasheet.
Enter panels in each series string and the number of equal parallel strings.
Compare cold-corrected voltage and current with every inverter or controller input limit.
Scenario comparison
| Scenario | What it demonstrates |
|---|---|
| Worked baseline | Panels rated at 49 V and 11 A arranged as six in series and two equal parallel strings produce approximately 294 V, 22 A and 12 total panels. |
| Cold voltage check | Panel open-circuit voltage rises in cold conditions and can exceed equipment limits. |
| Matched strings stress test | Parallel strings should have compatible voltage and panel characteristics. |
Common mistakes to avoid
- Ignoring cold voltage: Panel open-circuit voltage rises in cold conditions and can exceed equipment limits.
- Overlooking matched strings: Parallel strings should have compatible voltage and panel characteristics.
- Failing to test protection: Fuses, isolators, cable rating and earthing require professional design.
Check the result against equipment datasheets, a site survey and a written design from a qualified solar professional.
What can affect the result?
Cold voltage
Panel open-circuit voltage rises in cold conditions and can exceed equipment limits.
Matched strings
Parallel strings should have compatible voltage and panel characteristics.
Protection
Fuses, isolators, cable rating and earthing require professional design.
Limits of this estimate
The three-input mode calculates one chosen voltage/current pair and layout count; it does not apply temperature correction or certify inverter compatibility.
Sources and review information
Frequently asked questions
Is the solar series and parallel calculator 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.
Can array open-circuit voltage equal the inverter maximum?＋
No. Cold conditions can raise voltage, so professional design must retain the manufacturer's required safety margin.