Vertical bifacial solar seeking greenhouse albedo and deployment space


Even in non-traditional orientations, solar panels can provide a cost-effective and environmentally friendly energy solution when strategically installed.

This principle is currently being showcased by Spring Hill Greens, a Colorado-based farming operation nestled between two greenhouses. The unique vertical bifacial solar panel system optimises land use while potentially capitalising on the high albedo effect of the highly reflective greenhouse materials.

The system’s design and installation were handled by Sandbox Solar. While it doesn’t yet have a tool to fully measure the albedo effect without a control vertical system, the company has commenced experiments to provide further insights into generation curves.

Ian Skor, owner of Sandbox Solar, noted that production on snowy days is dramatically higher than any other installation. The project’s peak generation periods are at 9 am and 4 pm, which Skor likened to a “reverse duck curve.”

To help design and simulate the generation curves of the facility prior to construction, Sandbox Solar employed its in-house software, SPADE Agrivoltaic.

Preliminary data shows promising results. During the months of September through April (encompassing the northern hemisphere autumn and winter), the vertical bifacial system produced 559.28 kWh/kWp. This performance surpasses that of a nearby east-west rooftop system owned by Spring Hill by 14%, which produced 489.93 kWh/kWp. However, it falls behind a south-facing ground mount project, also a Spring Hill property, which achieved an output of 857 kWh/kWp, by 34%.

Denver-based Greentech Renewable provided the hardware for the project, which includes Canadian Solar 445 W BiHiKu bifacial solar modules, SolarEdge 11.4 240V single-phase inverters, p505 rail mounted optimisers, and Tamarack bifacial vertical solar fence racking.

“My summary is that the system saves dramatically on footprint and can increase the number of usable project areas,” said Skor, acknowledging the customer’s initial desire to maximize land use.

“The production during snowy days is dramatically higher than any other installation. This application may work extremely well in northern climates that experience significant snowfall.”

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