THERMGLASS

BIPV + Warm-Edge VIG Analysis

BIPV / VIG Integrated ROI Engine

Dual-stream energy payback analysis combining THERMGLASS warm-edge VIG thermal savings with Onyx Solar BIPV photovoltaic generation. US (ASHRAE / IECC) and EU (EN ISO 13790 / PVGIS) unit systems.

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Project inputs

BIPV module type

Visible light transmittance (VLT)

Glazing area (ft²)

Facade orientation

Glazing tilt

State (IECC climate zone)

Baseline glazing (Btu/h·ft²·°F)

THERMGLASS VIG U-value (Btu/h·ft²·°F)

ISO 10077-1 derived (pre-NFRC/EN 673 type-approval). Update when certified data available.

SHGC — baseline / VIG

Heating fuel type

Fuel cost ($/kWh)

Electricity tariff ($/kWh) — PV revenue + cooling

VIG premium ($/ft²)

BIPV module premium ($/ft²)

CIGS (Thin-Film)

Onyx Solar CIGS — best efficiency-to-transparency ratio. Preferred for commercial facades where moderate VLT and high yield are both required.

POA irradiance: 1,050 kWh/m²/yr · HDD: 4,450 · U-delta: 0.270 Btu/h·ft²·°F

Stream 1 — Thermal savings (VIG)

Heating saved1.4 MWhper year
Cooling saved564 kWhper year
Thermal savings$316per year
Total thermal2.0 MWhdelivered energy/yr

Stream 2 — PV generation (BIPV)

Annual PV yield3.2 MWhper year
PV revenue$517per year

Combined return

Total annual savings$833thermal + PV
Simple payback46.2 yrLong — consider higher-efficiency module or better orientation
VIG investment$11,000warm-edge premium
BIPV investment$27,500module premium
Total investment$38,500VIG + BIPV
NPV (10 yr)−$32,373at 6.0% discount
NPV (15 yr)−$30,414at 6.0% discount
NPV (25 yr)−$27,858full analysis period

Carbon reduction

Thermal CO₂ avoided761 kg CO₂per year
PV CO₂ avoided1.2 t CO₂per year
Total annual CO₂2.0 t CO₂per year combined
Lifetime CO₂ (25 yr)50.2 t CO₂total avoided

Compliance indicators

✓ASHRAE 90.1-2022 §5.5✓LEED v4.1 EA Enhanced—EN 50583 BIPV—EPBD nZEB

✓ / ✗ indicates whether entered U-values meet the threshold — not certified compliance. Formal compliance requires NFRC 100/500 (US) or EN 673 / EN ISO 10077 (EU) certified test reports and project-specific engineering review. VIG U-values are pre-certification estimates.

Download BIPV ROI Report (PDF)

Explore Other ROI Engines

Architectural ROI

Commercial & residential glazing — ASHRAE/IECC + EU EN ISO 13790 models

Refrigeration ROI

Walk-in coolers & freezer cases — ASHRAE 2022 §14, 15-yr model

Marine ROI

Vessel bridge & cabin glazing — route-weighted ΔT, 20-yr model

Heavy Equipment ROI

Construction & mining cab glazing — SAE J1503, 10-yr model

Passive House ROI

PHI/PHIUS/IECC residential — ASHRAE 2021 §18, multi-period NPV

All Configurators

Spec tools for US, EU, marine, cold storage, and heavy equipment