From solo installers doing residential work to EPC firms running MW-scale plants — one tool, right-sized for your workflow.
Free
Core sizing engine, no payment required. Start here.
Installer Pro
Everything a working installer needs to win proposals fast.
Studio Team
Collaboration features for design-build teams up to 5 seats.
Engineering Plus
Full commercial finance engine and 1 MW+ plant support.
Enterprise / White-Label
Custom seat counts, your brand, integration connectors, SLA. Typically used by EPC firms and utilities.
Contact for pricing →| Feature | Community | Installer Pro | Studio Team | Eng. Plus |
|---|---|---|---|---|
| Load analysis & daily kWh | ✓ | ✓ | ✓ | ✓ |
| Battery, inverter & PV sizing | ✓ | ✓ | ✓ | ✓ |
| Cable & protection sizing | ✓ | ✓ | ✓ | ✓ |
| SVG system diagram | ✓ | ✓ | ✓ | ✓ |
| Basic PDF export | ✓ | ✓ | ✓ | ✓ |
| Saved projects | Up to 3 | Unlimited | Unlimited | Unlimited |
| Commercial architecture engine | — | ✓ | ✓ | ✓ |
| Topology comparison (3 options) | — | ✓ | ✓ | ✓ |
| Branded PDF (logo + colours) | — | ✓ | ✓ | ✓ |
| Live PVGIS irradiance data | — | ✓ | ✓ | ✓ |
| Authority submission format | — | ✓ | ✓ | ✓ |
| Team workspace (seats) | — | — | 5 seats | 5 seats |
| Plant engineering handoff | — | — | ✓ | ✓ |
| Formal study surface & BOM | — | — | ✓ | ✓ |
| Large-scale (1 MW+) support | — | — | — | ✓ |
| Multi-standard: NEC + IEC + AS/NZS | IEC only | NEC + IEC | NEC + IEC | ✓ |
| Priority support | — | — | — | 48 h |
After payment, send your Installation Key (found in the calculator under Settings → Backend) to the contact email. You'll receive confirmation within 24 hours. Then open the calculator, go to Backend Settings, enter your key, and click Sync Entitlement. Features unlock immediately.
Yes — all plans are available in NGN via Paystack (Visa, Mastercard, bank transfer, USSD). USD pricing is also accepted for international customers via Paystack international or Wise transfer.
It's a unique identifier that ties your license to your calculator session. Open the app, go to Settings → Backend tab, and copy the Installation Key shown there. No account login is required.
Yes. Download pv_calculator_ui.html from the calculator page for a fully offline single-file version. Premium features still work offline once your license has been synced at least once.
Yes — reach out via email and request a 30-day trial license for any paid tier. No credit card required upfront for trials.
Yes. Downgrade or cancel any time by contacting support. No long-term contracts on monthly plans. Annual plans are non-refundable after 30 days but can be paused.
The calculator supports NEC (USA/Philippines), IEC 60364 (Europe/Africa/global), AS/NZS 3000 (Australia/NZ), and local adaptations. Engineering Plus covers all three simultaneously. Installer Pro supports NEC + IEC.
Off-grid, hybrid (battery-backed grid-tie), and grid-tie systems from 500 W residential to 1 MW+ utility scale. Single-phase 120 V/230 V/240 V and three-phase 400 V/480 V supported.