Bifacial Solar Panels: Are They Worth It? (Gains, Drawbacks, and Where They Pay Off)

Bifacial solar panels are worth it when light can reach their back side: ground mounts, pole mounts, carports, and tilted panels over light-colored surfaces or snow. There they typically add under 10% more energy over grass or soil, and up to about 30% over bright ground with the panels raised. Flush on a pitched roof, they gain little and are not worth a premium.

That range is the whole story, so this guide is about predicting where your install falls in it. We cover how bifacial panels work, the research behind those numbers, the real drawbacks, and the setups where we would and would not choose them.

What is a bifacial solar panel?

A standard (monofacial) panel collects light only on its front; the back is an opaque sheet. A bifacial panel has solar cells that can collect light on both faces, sealed behind glass or a clear backsheet. The front still does most of the work. The back adds a bonus from light reflected off the ground, a roof, or snow underneath.

Bifacial is not a different cell type competing with monocrystalline. Most bifacial panels sold today are monocrystalline, often with newer cell technologies such as TOPCon. So "mono vs bifacial" is really "one-sided vs two-sided."

How much more power do bifacial panels produce?

It depends on two things: how reflective the surface under the panels is (its albedo), and how much room light has to get behind them.

Research from Purdue University and the National Renewable Energy Laboratory modeled bifacial panels worldwide and found that with a low ground albedo of 0.25, ground-mounted bifacial modules gain less than 10%, while raising the albedo to 0.5 and elevating the modules about 1 meter can boost the gain to 30%.

In plain terms:

• Grass, dirt, or dark gravel reflect little light. Expect a single-digit gain.
• Light gravel, sand, concrete, or a white roof membrane reflect more. Gains climb well above 10% when the panels are tilted and raised off the surface.
• Snow is the most reflective common surface, and NREL field testing has found snow gives the biggest boost, which makes bifacial panels especially useful in snowy winters when sun hours are already short.

Height and spacing matter too. Panels mounted close to the ground, or packed tightly in long rows, shade the very ground they need to see. Separate NREL and Sandia work found that a module in the middle of a large array can produce up to 7% less energy than a single bifacial module, because the surrounding rows shade the ground.

Here is what a modest gain is worth. Eight 580W panels make about 17.4 kWh on a 5 peak sun hour day after real-world losses. A 10% bifacial gain adds about 1.7 kWh a day on top, for free, from the same racking and the same footprint.

Is a bifacial solar panel better?

In the right install, yes: more energy from the same space, and bifacial panels with glass on both sides are typically very durable. In the wrong install, you pay for a back side that never sees light. Ask these three questions:

1. Can light reach the back? On a ground mount, pole mount, pergola, or carport, yes. Flush against a pitched roof, almost none.
2. What is under the panels? Light surfaces and snow pay off. Dark shingles and dense grass do not.
3. Will the racking shade the back? Rails and cross-members running behind the cells cast shadows. Racking designed for bifacial panels keeps the back clear.

What are the disadvantages of bifacial solar panels?

• Weight. Glass on both sides makes them heavy. Our MEGA 580 bifacial weighs 68.8 lb and measures 89.7 x 44.7 inches. That is a two-person lift, and it matters for roofs and mounting hardware.
• Size. Bifacial panels are mostly large, utility-style modules running 40-plus volts at maximum power. They are not RV or portable panels, and they need a charge controller or inverter rated for higher string voltages.
• Mounting matters more. The gain depends on height, tilt, spacing, and racking, so a careless install throws most of it away.
• Gains are hard to predict. Datasheet ratings measure the front side only. Your actual bonus depends on your site, which is why we give a range rather than a single number.
• Often sold in bulk. Many bifacial panels ship by the pallet or in multi-packs, which suits a full array more than a one-panel project.

Can you mount bifacial solar panels on a roof?

Yes, but it changes the math. Flush-mounted on a pitched shingle roof, the back sees almost no light, so a bifacial panel performs about like a good monofacial panel. That is fine if the price per watt is the same, but not worth paying extra for.

Tilted up on a flat roof with a white or light membrane, bifacial panels can earn a meaningful gain, because the bright surface and the gap behind the panel let reflected light in.

Where bifacial panels make sense (and where they do not)

Good fits:

• Ground mounts and pole mounts for homes, cabins, farms, and off-grid systems
• Carports, pergolas, and awnings where the back faces open space
• Snowy climates, where reflected winter light helps most
• Flat white roofs with tilted racking
• Vertical, east-west fence-style installs, where both faces catch direct sun at different times of day

Poor fits:

• Flush-mounted pitched roofs
• RV roofs, vans, and boats
• Portable and folding panels

Our picks: bifacial panels, and a standard alternative

Every panel below is carried by Krato Power and in stock as of this writing.

Best bifacial panel for ground and pole mounts: MEGA 580 Bifacial. 580W, 42.7V at 13.6A at maximum power, 51.4V open circuit, 22.5% efficiency, TOPCon cells, with a 25-year output warranty and 10-year manufacturer warranty. Sold as an 8-panel set (4,640W) for $3,799.99 and shipped by pallet. That works out to about $0.82 per nameplate watt before any bifacial gain.

Best bifacial set for a smaller array: Renogy 590W N-Type Bifacial. Two 590W panels (1,180W) for $989.99, or four for $1,889.99. 43.71V at 13.50A at maximum power, 52.63V open circuit, 22.8% module efficiency, and N-type cells with an 80% bifaciality factor, at 58.4 lb per panel. About $0.84 per nameplate watt for the pair, and a realistic starting point for a cabin, shed, or barn ground mount.

If your panels are going flush on a roof: MEGA 410. A standard 410W panel sold in sets of 8, 10, or 12, from $2,799.99 for eight (3,280W, about $0.85 per watt). On a pitched roof where the back of a bifacial panel would see little light, a quality monofacial panel like this is the simpler choice.

A useful detail from the two MEGA prices: in our current catalog the bifacial 8-pack actually costs slightly less per nameplate watt than the standard 8-pack. So for a ground mount, any bifacial gain you earn is a pure bonus, not something you pay extra to chase.

Compare options on our bifacial solar panels, 400 watt solar panels, and solar panels pages, or call our team at 888-855-7286 with your site and mounting plan.

Frequently asked questions

Is a bifacial solar panel better? It produces more energy when its back side can see reflected light: typically under 10% more over grass or soil, and up to about 30% over bright surfaces with the panels raised. Flush on a roof, it performs about like a standard panel.

What are the disadvantages of bifacial solar panels? They are heavier and larger, need careful mounting and bifacial-friendly racking to deliver their gain, are often sold in bulk, and give little benefit on flush pitched roofs.

Can you mount bifacial solar panels on a roof? Yes. Tilted on a flat, light-colored roof they gain meaningfully. Flush on a pitched roof they gain very little.

Which is better, mono or bifacial solar panels? Most bifacial panels are monocrystalline too. The real choice is one-sided or two-sided, and two-sided wins wherever light can reach the back.

Do bifacial panels work in winter? Yes, and snow is where they shine. Snow reflects far more light than grass, so the back side contributes the most when days are short.

Can I use bifacial panels on an RV? We do not recommend it. They are large, heavy, high-voltage modules, and a flat RV roof blocks the back. Our best solar panels for RV guide covers better options.

Planning a ground mount or a big array? Compare bifacial solar panels and 400 watt solar panels, and check your string voltages with our series vs parallel guide. Or call our team at 888-855-7286 and we will help you size it.

This guide is general information, not electrical or professional installation advice. Large arrays and any grid-connected system must be installed per the manufacturer's instructions and local codes, typically by a qualified installer. Bifacial gain depends on your site, surface, mounting height, tilt, and spacing.

Reviewed by the Krato Power team. Questions? Reach us at 888-855-7286.