Solar Panel Calculator - Estimate solar costs, savings and payback in minutes
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Free solar panel calculator for US homeowners. Estimate system size, panel count, installation cost, tax credit, savings, and payback time in minutes.
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SunMetricLab is a free, no-signup solar planning tool for US homeowners. Estimate the recommended system size, number of panels, installation cost, federal tax credit, annual savings and expected payback period in minutes. It also includes state-specific solar cost guides and dedicated calculators for ROI, batteries and system sizing. No sales calls, no lead forms - just transparent estimates.
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Finally tried a few inputs and the payback time estimate felt realistic for my area, which is more than I can say for other calculators I've poked at. The tax credit breakdown was a nice touch.
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Maker
@ezels5ii Thanks for trying it out! I’m glad the payback estimate felt realistic for your area. The tax credit breakdown was included because it can make a surprisingly large difference to the final numbers.
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Would love to see a shading analysis built in. Even a simple input where you describe nearby trees or obstructions and get a rough output derate on your production estimate would be really useful. Most people I know grossly overestimate their roof's true solar potential and that one extra step could save folks from being disappointed by their actual first year production numbers.
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Maker
@kaanalayandvxb Thanks, that’s a great suggestion. Shading is probably one of the biggest factors the current estimate cannot fully account for. I’m considering adding a simple shading adjustment based on nearby trees, roof orientation and estimated daily obstruction, without making the calculator overly complicated.
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Pulled up a quick estimate on my house and the panel count plus payback timeline felt realistic based on the quotes I got last year. The tax credit breakdown is a nice touch.
Report
Maker
@eymenevf2 Really appreciate the feedback! It’s great to hear the panel count and payback estimate were close to the quotes you received. That kind of real-world comparison is especially useful for improving the calculator.
Replies
Finally tried a few inputs and the payback time estimate felt realistic for my area, which is more than I can say for other calculators I've poked at. The tax credit breakdown was a nice touch.
@ezels5ii Thanks for trying it out! I’m glad the payback estimate felt realistic for your area. The tax credit breakdown was included because it can make a surprisingly large difference to the final numbers.
Would love to see a shading analysis built in. Even a simple input where you describe nearby trees or obstructions and get a rough output derate on your production estimate would be really useful. Most people I know grossly overestimate their roof's true solar potential and that one extra step could save folks from being disappointed by their actual first year production numbers.
@kaanalayandvxb Thanks, that’s a great suggestion. Shading is probably one of the biggest factors the current estimate cannot fully account for. I’m considering adding a simple shading adjustment based on nearby trees, roof orientation and estimated daily obstruction, without making the calculator overly complicated.
Pulled up a quick estimate on my house and the panel count plus payback timeline felt realistic based on the quotes I got last year. The tax credit breakdown is a nice touch.
@eymenevf2 Really appreciate the feedback! It’s great to hear the panel count and payback estimate were close to the quotes you received. That kind of real-world comparison is especially useful for improving the calculator.