A floor you can defend
Your quote carries an expected figure and a lower bound, and you can explain where the bound comes from. That is a conversation you cannot have today.
For installers
Your customers already distrust the number on your quote.
Give them a range with a floor you can defend, on your letterhead. Built from the same engine that produced the calculation they arrived holding.
Your letterhead, our arithmetic
The report carries your name and logo. It comes from the same engine that produced the calculation your customer arrived holding, so the two never contradict each other.
Leads from your region
Homeowners who run our calculator and ask for advice are routed to subscribing installers near them, and only when they ask for it themselves.
What works today, and what does not
We would rather tell you what is missing than have you find it. Everything in the first column is running now and you can check it yourself from any page on this site.
Working now
- A yield model covering 38 locations on six continents, from PVGIS, with the fetch script committed so the figures can be reproduced
- A Great Britain savings calculation from a tested Python engine, reported as a range with a stated lower bound rather than one number
- Nineteen guides where every figure carries a named source and the date it was checked
- An anonymous record of what visitors model, and an opt-in list of households asking to be contacted
Not built
- Bill reproduction. Reading a real energy bill line by line is the check we want to be judged on, and there is no parser yet. The upload control is switched off rather than shown as a button that cannot succeed.
- Export rates quoted in prose. We hold 29 tariffs across 13 suppliers, none yet verified against the supplier’s own tariff sheet, so none of them appear anywhere except a table that marks them unverified.
- Any market other than Great Britain. The Dutch and US rules are written up in the guides; the calculator refuses them rather than approximating.
- Your own branding on a customer-facing report. That is what a pilot would define.
Demand signal
What households in your area have modelled
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Ways we can be useful
Not all of these suit every company, and none of them is a fixed package. Tell us which part of your job is painful and we will say honestly whether we can help with it.
A second opinion on a yield figure
Send us a roof and we will model it independently and show the working. Useful when a customer arrives holding a competitor’s number and you need to explain the difference without it becoming your word against theirs.
A defensible range on your own paperwork
An expected figure with a calibrated lower bound, rather than a single flattering total. It is a harder number to sell against and a much easier one to stand behind two years later.
Households who have already done the arithmetic
People who reach us have modelled their own roof and understand why the answer is a range. They arrive with a realistic expectation, which is a different conversation from a cold enquiry.
Straight answers on the awkward questions
Shading, degradation, whether a battery pays, why a quote looks oversized. Nineteen guides that say when the answer is no, which you can send a customer instead of writing the email yourself.
Help reading a tariff
Export rates, what a headline rate is conditional on, and what the Smart Export Guarantee does and does not require. If you have a case you cannot make sense of, send it over.
Something we have not thought of
This is early enough that what we build next is genuinely shaped by who asks. If there is a calculation you keep doing by hand, that is worth an email.
Not sure whether any of this fits? Email us and describe the job. If we are not the right answer we will say so, and we will usually know within a message or two.
Request a pilot
For certified installers. We will get in touch to work out whether this fits. Access is not automatic.