Who we are
Solar Metrix is an independent solar planning toolkit operated by the Solar Metrix Dev Team, based in Multan, Pakistan. We build free calculators and plain-language guides for homeowners, installers and energy professionals who need to make a solar decision without starting from a sales proposal.
The site is not an installer, a lender, an engineering consultancy or a utility. We do not install panels, issue structural certificates or approve grid connections. Our job is to help you understand the numbers before you speak to someone who does.
What we publish
Our calculators cover the decisions that usually decide whether a solar project makes sense:
- Sizing and production: system size, energy yield, roof space, panel tilt and string layout.
- Storage and backup: battery backup sizing, battery payback and grid versus battery.
- Money: payback, 25-year cash flow and solar loan repayments.
- Planning: expanding an existing system, future appliances and electric vehicle running costs.
Each calculator has a companion guide that explains the method, the assumptions, a worked example and the point where the estimate stops being reliable. We would rather show you a range and its limits than a single confident number.
How the tools are built
The calculators combine the numbers you enter with historical weather data, standard engineering relationships and clearly labelled planning assumptions. Where a value is a default — system losses, soiling, temperature coefficient, battery efficiency, tariff escalation — it is editable. Results are labelled as calculated, estimated or preliminary so you can see which numbers are yours and which are ours.
We do not accept payment from manufacturers to change a calculation, hide a loss or recommend a particular product. Commercial relationships, where they exist, are kept separate from the maths. If we introduce advertising or sponsored placements, they will be labelled and will not change the calculator output.
Independence and funding
The calculators are free to use. The site may fund itself through optional Pro features, installer lead referrals or advertising. A lead referral happens only when you choose to submit a quote request; it does not change the sizing or payback result you see. Advertising, if introduced, will be disclosed in the privacy and cookie policies before it goes live.
What we are not
Planning estimates, not professional advice. Solar Metrix does not provide financial advice, legal advice, structural engineering, electrical design or a guarantee of performance. A calculator result is not a quotation. Confirm the design, price, warranty, structural capacity, electrical safety and grid approval with a qualified professional and your utility.
Corrections and contact
We aim to keep the formulas, assumptions and policy references accurate. If you find an error, a broken link or a result that looks wrong, email privacy@solarmetrix.app with the page URL and the inputs you used. Corrections are reviewed and, where they change a result, the page is updated with a new date.
For privacy requests, use the same address with “Privacy request” in the subject. For installer partnerships, use “Installer partnership”. Our full contact details are on the Contact page.