I was talking to our resident genius last week. He said that he had two solar panels on his roof for many years, connected to a home built boiler feedback loop. His key trick was to keep water temperature below 60 degrees and above freezing point year round, using solar in the warm months, but reverting back to gas in the depths of winter, when draw is much higher.
Elegant, simple, set and forget, focused not on maximum delivery, but on scalable results under variable weather conditions. A small, local experiment fit for the purpose intended. It appears that a good initial scale is “small,” local, and minimalist.
Overhyped?
Wind power, biogas and solar were hyped as the needed change to turn the world toward “clean, renewable” “energy.” Wind farms cost significant sums, require a lot of space. In many cases, their output to cost ratio has not broken even. The “greenwashing” “circular solar” accusation can also be leveled at Chinese solar panels being shipped from half a world away…
A lot of wind, not so much power.
Anon
Challenges of Scale
Wind and Solar Inconsistencies: Despite promises of abundant clean energy, renewables like wind and solar face reliability issues. Even countries heavily invested in renewables, such as Germany, occasionally struggle with “energy gaps” during low wind or cloudy seasons. This, coupled with deregulated energy pricing, makes energy more expensive at the “wrong” moment.
Rural Electrification: In developing nations, solar home systems have failed due to inadequate maintenance, limited battery lifespan and high upfront costs. For example, in sub-Saharan Africa, over-reliance on grant-funded solar installations has left many systems non-operational due to a lack of local expertise.
Inefficiencies in Microgrids: Some community-level microgrids have failed to scale due to regulatory hurdles, lack of community buy-in, or insufficient power during peak demand.
Wind Turbines and Land Use: Large-scale wind farms require significant space, sometimes conflicting with local communities or wildlife habitats. Bird mortality rates around wind farms generates public criticism from environmentalists, walkers and bird watchers. Often, bigger projects are imposed on rural communities rather than agreed to via consensus – “they don’t want to see the red-blinking lights atop those 50- or 60-story-high wind turbines, all night, every night, for the rest of their lives.”
The Success Stories
Sailors and Solar:
Onboard solar installations have revolutionized long-haul sailing, allowing yachts and small boats to stay operational for extended periods without relying on diesel. Compact, durable solar panels, combined with efficient lithium-ion batteries, enable everything from GPS systems to refrigeration to communications and AIS.
Insulation Schemes:
In colder climates, combining solar with high-efficiency insulation has proven transformative. In regions like Scandinavia, passive solar homes—built with materials and designs that maximize solar gain—require little to no active heating, drastically reducing energy bills.
Micro-Mobility Wins:
E-bikes and scooters powered by small-scale solar installations offer a glimpse into the future of urban mobility. Cities like Barcelona and Berlin are experimenting with solar-powered docking stations that charge fleets efficiently. The trend towards battery swapping nicely dovetails with urban solar docking for e-cargo.
Remote Communities:
Off-grid solar and wind systems have succeeded in remote regions like the Himalayas and Pacific islands, where centralized grid access is impossible. In Ladakh, India, small wind-solar hybrid systems power entire villages during harsh winters, reducing reliance on kerosene and diesel.
What Makes It Work?
- Hybrid Systems: Integrating wind, solar, and battery storage creates balanced, resilient solutions.
- Maintenance: Microgrids and solar systems are not set and forget systems. Significant value is afford in good maintenance schedules.
- Localized Focus: Projects tailored to specific community needs—like Alaska’s wind-diesel hybrids—show higher rates of success.
