Plan your solar system in 60 seconds — for free.
Know the right solar system, likely cost, payback, and verified installers before you pay for solar.
SolarSizer Plans
Free to design. Pay only to download.
Size your system, compare all three tiers and read your confidence score at no cost. Choose a plan only when you want the report — or, as an installer, the leads.
See full pricingFree Design
$0forever
Everything you need to size a system and decide whether solar is worth it for your roof. No card required.
Start free estimateIncludes:
- Design & generate your solar PV system
- Budget · Standard · Premium tiers side-by-side
- Confidence score with formula disclosure
- Bill upload with OCR extraction
- Compare scenarios on your dashboard
Detailed Report
$9one-time
Unlock the downloadable 16-section PDF, version-stamped so it stays reproducible. Or go unlimited at $23/month.
Compare report plansIncludes:
- Everything in Free Design
- Downloadable 16-section PDF (PRD §13)
- Version-stamped for reproducibility
- Lifetime access from your account
- Share link for your installer or bank
Installer Pro
$49/ month
Verified, lead-quality-scored homeowner projects delivered to your inbox — with a first-month money-back guarantee.
Register as installerIncludes:
- Lead-quality scored homeowner inquiries
- Verified phone & email contact details
- Lifecycle tracking, new → converted
- Country / region targeting
- First-month money-back guarantee
System Tiers
Same demand, three levels of hardware
Budget System
350 Wpanels
Value-class modules with lead-acid storage. This is the cost baseline every other tier is capped against.
Size it freeStandard System
450 Wpanels
Lithium storage and better inverters, with the installed total capped at 1.25× your Budget build.
Size it freePremium System
550 Wpanels
Top-class modules and lithium storage for the most output per m² of roof — capped at 1.5× your Budget build.
Size it freeFrom appliance list to installer quote in under a minute
A deterministic engine sizes the system. A confidence score tells you how much to trust the numbers. You decide what to do next.
Tell us your loads
List your main appliances or upload an electricity bill — we extract usage automatically with OCR.
See three sized systems
Budget, Standard, and Premium tiers with PV / inverter / battery / cost / payback side-by-side.
Request quotes or download
Send your project to up to 3 verified installers, or download a 16-section PDF you can share.
Everything you need to make a confident solar decision
No upsell to see results, no fake precision. Every number you see is reproducible from a stamped formula version + assumption set.
Deterministic sizing engine
PRD §10 formulas: PV kWp, inverter kW, battery kWh, panel area, peak load, payback. Same answer every time.
Transparent confidence score
0–100 score with the seven PRD §11 weighted factors. You see exactly which inputs lifted or capped your number.
Bill OCR with reconciliation
Upload your bill, we extract kWh + tariff. Bill-vs-appliance diff flags loads you've forgotten.
Three tiers, one demand
Budget · Standard · Premium use the same kWh demand but different component classes — installer margin is broken out, not hidden.
Verified installer marketplace
Lead-quality score (PRD §8.9 FR-045) helps installers prioritise. You choose who sees your contact details.
Reproducible PDF report
16 PRD §13 sections. Every report stamps formula + assumption + price-table version so old reports never go stale.
Get a real estimate before you ever talk to an installer
Traditional solar shopping starts with a 3-quote scramble. We flip that: get a credible number first, then compare quotes against a benchmark.
Traditional installer journey
- 2–4 weeks of site visits before any number
- No way to compare quotes apples-to-apples
- System size, tariff, payback all opaque
- Bill data interpreted differently by each installer
- Hidden margin baked into every line item
SolarSizer AI
- First credible estimate in under 60 seconds
- Three tiers side-by-side from one demand
- Every number traces back to a formula + assumption
- Confidence score tells you what to trust
- Installer margin broken out as its own line item
Free to use. Pay only for the downloadable report.
Calculator, confidence score, scenario comparison, installer quote requests — all free. The detailed PDF is $9 one-time, with lifetime access from your account.
Stop guessing. Get a credible solar estimate in 60 seconds.
No site visit required. No credit card. Just a few questions and three sized systems ready for installer quotes.