A new method developed by Chilean researchers could revolutionize residential hydrogen production. By internally reconfiguring discarded photovoltaic panels and eliminating complex electronics, they have created a system capable of producing 345 liters of green hydrogen daily—several times the requirement of an average household.
A Dual Challenge, A Single Solution
During the global energy transition, we face two major hurdles: the growing volume of discarded solar panels (PV waste) and the high cost of green hydrogen production. The Chilean research team proposes that end-of-life panels, which still retain 80-90% of their original capacity, are not waste but valuable resources.
The key to their solution is simplicity. While traditional systems require expensive and complex power electronics (like inverters and Maximum Power Point Trackers), the Chilean scientists modified the solar module itself.
Internal Architecture Shift: The Secret of Voltage Matching
By accessing the internal busbars of the solar panels, the researchers modified the electrical connection of the cells. Instead of relying on an external controller to match the current to the electrolyzer, they connected subsets of cells in parallel.
This “voltage matching strategy” allows the panel to connect directly to a proton exchange membrane (PEM) electrolyzer. A major advantage of this technology is its flexibility: it can be applied to both 60- and 96-cell standard architectures, overcoming the heterogeneity of waste panels and allowing the isolation of localized cell failures.
Quantitative Data: More Than a House Consumes
During experimental validation under real-world conditions, the system delivered impressive performance:
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Daily hydrogen production: approx. 345 liters.
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Basic household demand (cooking/heating): approx. 120 liters/day.
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System energy yield: Reaches 88% of the yield obtained with power electronics-based optimization.
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Solar-to-hydrogen efficiency: 7%, which represents more than 70% of the theoretical maximum for simplified configurations.
Economics and Sustainability
According to the economic analysis, the system achieves a Levelized Cost of Hydrogen (LCOH) of approximately $5.8 USD/kg. This represents an 18% reduction compared to more complex reference systems. The cost advantage stems primarily from two factors: the elimination of expensive power electronics and the reuse of existing photovoltaic modules.
Although the efficiency is slightly lower than that of advanced electronically controlled systems, the low investment cost, simplicity, and ease of integration make it an ideal option for decentralized, residential applications. The process not only provides affordable energy but also extends panel lifespans and reduces pressure on raw material supply chains.
Sources:
- The detailed results of this research were published in the journal Energy Conversion and Management under the title “Green hydrogen production using discarded photovoltaic panels for household applications”.