Guides
Practical buying guides covering specs that actually affect performance — wattage sizing, cell technology, and mounting hardware.
Why this page exists
Solar panel listings quote peak wattage measured under Standard Test Conditions — 1,000 W/m² irradiance, 25°C cell temperature. Real-world output is typically 75–85% of that figure, and it drops further as panels heat up. Most buyers size their array on the nameplate number and end up with a system that underperforms on every normal day.
This page covers how to translate your actual loads into a wattage target, what monocrystalline vs polycrystalline vs flexible panels mean in practice, and what to look for when comparing rigid roof panels against portable folding options.
Solar panels worth searching on eBay
Panels for off-grid, RV, van, marine, and rooftop installs. We earn a small commission on qualifying sales; your price is unchanged. Full disclosure.
100W Solar Panel
The most common single-panel starter size. Produces roughly 300–500 Wh/day in good sun. Works for a small cabin, van auxiliary battery, or supplementing a boat bank. Check whether the price includes a charge controller.
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Portable Solar Panel
Folding briefcase or kickstand-style panels designed for camping and overlanding. Usually 100–200W, integrated handle, pre-wired with MC4 or Anderson connector. Efficiency matters more per pound than in a fixed install.
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Monocrystalline Solar Panel
Higher efficiency (typically 19–22%) than polycrystalline — more watts per square foot. The right pick when roof or van space is limited. Black cells vs blue cells is often the quickest visual identifier.
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Solar Panel Kit
Bundled systems including panel(s), charge controller, wiring, and mounting hardware. Convenient for first builds but verify the controller type (MPPT vs PWM) and battery compatibility before assuming it all works together.
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Flexible Solar Panel
Thin-film or curved monocrystalline panels that conform to curved surfaces like RV roofs, boat decks, or van tops. Lighter than rigid glass panels but typically lower efficiency and shorter lifespan — verify warranty length.
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