Enter panel voltage, series count, and number of parallel strings.
Plug-and-play system builder
PV schematic builder, power-flow and heat simulator
Configure the main PV components, review compatibility, visualise vertical energy flow, and identify conductors or equipment that may run hot or require resizing.
No account Instant result Explanation included
1Tell us what you knowStart with the fields you already understand.
2See the recommendationSee the number and why Solar Plan Lab suggested it.
3Refine or downloadChange the plan before you buy or download anything.
New to solar? You do not need to choose a calculator first. Build a guided home solar plan →
Component configuration
System inputs
Start with the essentials. Open Advanced for data-sheet limits and protection settings.
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Vertical icon schematic
Power-flow and thermal simulator
The animation starts automatically. Use the load buttons to change operating conditions and watch thermal utilisation change.
Solar DC flowBattery supportGrid / export pathNormal loadingHeat reviewResize required
Thermal and resize review
Where heat may develop
These cards compare the simulated current or power with simplified reference limits. Orange means the item is approaching the limit; red means the entered selection should be reviewed or resized.
How to use this builder
Plug-and-play workflow
Compare string voltage against maximum DC voltage and MPPT range.
Enter the selected conductor, breaker, and fuse ratings.
Use minimum, mid, and peak load to identify power-flow and thermal bottlenecks.
Example calculation
Solar Plan Lab uses the current project values to show how the recommendation changes.
Do not rely on one number alone
Check the result against actual equipment and site conditions.
Is this installation-ready?
No. It is a planning estimate that should be verified by qualified professionals.
How was this calculated?
Calculation method
Formula
The calculator uses the displayed inputs and standard planning relationships.
Important assumptions
Read the full methodology and update history → Verify the final design against actual equipment data sheets, site conditions, and applicable requirements.