HQST Solar Panel 30 Watt 12 Volt Polycrystalline Portable, High Efficiency Module Off Grid PV Power for Battery Charging…

Amazon.com Price: $39.99 (as of 12/06/2021 14:50 PST- Details)

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Fully self powered off-grid system: provides up to 30 watts of clean, free, renewable power.
Portable back up power: designed for maintaining 12 volt batteries in RVs, cabins, boats, battery operated gates, back-up power and remote power use.