eWATT

Overview

eWATT converts solar thermal energy directly into electricity, bypassing the photovoltaic effect. Instead of silicon PV cells (which use only the 0.4–1.1 μm band), it exploits mid/far-infrared heat (>1.1 μm) — roughly 70 % of total solar energy, with ~3× higher specific energy density than visible photons — via patented thermal absorbers, a thermodynamic cycle and generator, and (future) thermionic emission modules. No silicon, no photo-degradation, no rare-earth materials.

Applications

Primary use cases: stationary solar power; industrial facilities; mobile (trucks, ships); autonomous power nodes; (eWATT-S compact version) small vehicles, off-grid homes, distributed energy.

Industries and users: utilities, industry, off-grid/mobile operators.

Scale: stationary plants to compact units.

Operating Principle

Patented thermal absorbers capture solar heat, converted to electricity by a thermodynamic cycle + generator and, in development, thermionic emission modules (a low-work-function surface on micro-needles/beads emits electrons into vacuum when heated — heat-driven, no light needed). Works under diffuse light and high temperature, with no precise orientation required.

Limitations: efficiency claims are optimistic and need independent validation; thermionic modules still in development.

Key Parameters

Spectrum: mid/far-IR >1.1 μm (~70 % of solar energy; ~3× density). Efficiency: silicon PV 18–24 % vs eWATT claimed 60–70 % realistic (theoretical up to 72 %; thermionic ~30 % conservative; "PV-equivalent up to ~90 %" per source).

No silicon/rare-earths; life 20–25 years; higher output per unit area; stable output.

Architecture and Components

Patented thermal absorption elements; thermodynamic cycle + electric generator; (future) thermionic emission modules (low-work-function micro-needle/bead emitters in vacuum); power conditioning. Compact eWATT-S variant.

Advantages

Technical: uses the ~70 % of the solar spectrum PV ignores; no silicon/photo-degradation; works in diffuse light/high heat; no precise orientation.

Economic: CAPEX claimed 4–5× lower than silicon solar; minimal OPEX (no PV inverters/degradation); payback 2–3 years; thermionic manufacturing (microstructures, no lithography/clean rooms) far cheaper than silicon.

Environmental: no rare-earths, durable, simpler recycling.

Strategic: higher power density and smaller footprint than solar farms.

Integrations

Stationary, mobile (trucks/ships), and off-grid nodes; reuses excess thermal energy; complements ARBOK solar/thermal and storage systems.

Deployment & Operation

Steps: site/heat assessment → absorber + conversion install → operate. No precise sun-tracking; long life; minimal maintenance.

TRL

TRL 3 (confirmed by Michael). Proof-of-concept; thermionic modules in development; efficiency/cost claims need independent validation. Remaining: prototype build and validation.

Market Potential

Solar generation is huge but PV is capped at ~20 % efficiency and uses silicon/rare-earths. A higher-efficiency, silicon-free thermal-to-electric route — if validated — addresses utility, industrial, mobile, and off-grid solar markets.

Typical Project Economics

Claimed CAPEX 4–5× below silicon solar; payback 2–3 years; minimal OPEX; 20–25-year life. Economics contingent on validated efficiency. (Indicative until prototype data.)

Risk Factors

Efficiency claims (60–70 %, ~90 % PV-equivalent) are aggressive and need independent validation; thermionic modules unproven at scale; prototype-to-product gap; investor scrutiny of high-efficiency solar claims.

Related Technologies

Arbok Nanofluid Collector · TERU · TEG-Blanket · TRISTONE (TEG-Electroliser)