Why most solar panel calculators are wrong (and what to use instead)
- Gary Carter
- Aug 14
- 2 min read
If you’ve ever Googled “solar panel calculator,” you’ve probably seen dozens of tools promising to estimate your savings.
But here’s the truth: most of them are built to sell you something not to give you an accurate, independent view of your business’s real potential.
In fact, relying on a generic solar calculator could lead you to:
Choose the wrong funding model.
Overestimate your returns.
Miss key risks that could derail your project.
The problem with typical solar calculators
Most calculators are made by installation companies and their primary aim is to funnel you into their sales pipeline.
This often means:
Generic assumptions about energy use, sunlight hours, and panel performance.
No consideration for your unique operating hours or seasonal energy patterns.
Ignoring funding models like leasing or PPA that might suit your cash flow better.
Skipping over whether now is actually the right time for your business to invest.
What businesses actually need from a solar panel calculator
If you’re a finance director, operations lead, or sustainability manager in an energy-intensive sector like manufacturing, hospitality, or care, you don’t need “ballpark figures”.
You need:
A realistic ROI projection based on your exact usage.
Comparisons of purchase, lease, and PPA models.
An independent verdict with no hidden sales agenda.
A view of potential risks before you commit.
Meet the Feasibility Kickstarter: the calculator that goes beyond numbers
The Feasibility Kickstarter is the UK’s only commercial solar calculator designed to be:
Independent: we’re not an installer, so our results are unbiased.
Funding-aware: see exactly how your choice of purchase, lease, or PPA affects your returns.
Tailored for business: we factor in energy usage patterns, operational hours, and site conditions.
Action-oriented: if the numbers work, we help you create the strongest business case possible.
How it works
1️⃣ Tell us about your site: energy use, roof space, and your readiness for renewable energy.
2️⃣ We model your savings: we compare multiple funding options and calculate ROI and payback.
3️⃣ Get a clear verdict: know if solar makes sense for you right now, and if it does, how to get started.
Why it's the best option for UK businesses
✅ Unbiased: our incentives are aligned with your best outcome.
✅ Comprehensive: no other free calculator covers savings, funding, and readiness.
✅ Client-centric: entirely focused on getting the very best project outcome for you.
✅ Built for the commercial market: we align projects with your business objectives.
Try it now for free
Don’t risk making a six-figure investment based on a rough online guess.
Use the Feasibility Kickstarter today and get a realistic, independent, and actionable assessment in minutes.
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