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That's at the bottom of the article:

Production footprint PV multicristalline: 4200kWhee/kW [1] * 0.1kW = 420kWh embodied energy

Production footprint lead-acid battery: 321kWhee/kWh [1] * 0.5kWh = 161kWh embodied energy

Total Footprint: 581kWh

Annual energy production system: 155kWh/y

Payback period: 581kWh / 155kWh/y = 4+ year footprint payback



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