GridGuard 40W folding monocrystalline solar panel for 12V charging

GridGuard 40W Folding Monocrystalline Solar Panel, 12V Charging

$22.99

In Stock

30-Day ReturnsHassle Free
2-Year WarrantyOn Every Item

Is this the right one for you? Read the quick guide below ↓

30-day returns and damage protection Return most items within 30 days. If your order arrives damaged, we will replace it or refund you. Free return pickup on bulky and heavy items.

Product details

2-Year GridGuardPlus Warranty included. Every item we sell is backed by our two-year warranty. Questions? Call 1-800-680-4080.

A 40W folding monocrystalline solar panel built for 12V battery charging. The briefcase-style folding design is easy to set up and pack down, which makes it a practical choice for RV, camping or off-grid 12V charging.

Solar panels turn sunlight into usable power, so you can recharge without the grid. Pair the panel with a compatible battery, power station or device to keep your gear running wherever the sun reaches.

Key specs

40W solar output (panel rated capacity, not a battery)
Monocrystalline cells
Briefcase-style folding design

Best for

12V battery charging
RV and camping
Maintaining a battery between trips

What to expect from the sun

On a clear day with about four hours of strong sunlight, a 40W panel typically yields roughly 120Wh of usable energy after real-world losses. Cloud, haze, shade and a poor angle will reduce that.

Good to know

A solar panel only produces power while it is in sunlight, and its rated wattage is what it can deliver under ideal conditions, so real-world output will usually be lower. Angle the panel toward the sun and keep it free of shade. Before you order, make sure the panel's connector and voltage are compatible with the power station or battery you plan to charge.

Setup and care

Unfold on a flat, stable surface angled toward the sun
Keep the panel clean and free of shade
Connect to a compatible device or controller before leaving it in the sun
Fold and store dry after use

Frequently asked questions

Does it work on cloudy days?
Yes, but at much lower output. Direct sun at a good angle gives the best results.

Will it work with my power station or battery?
It depends on the connector and voltage. Send us your model before you order and we will confirm, or call 1-800-680-4080.

How should I store and clean it?
Fold it, keep it dry and wipe the surface with a soft damp cloth. Do not use abrasive cleaners.

Can I leave it outside?
Use it outdoors while the sun is out, but bring it in during storms and store it dry for the best life.

Buy with confidence from GridGuardPlus

2-year GridGuardPlus warranty on every item
Free return pickup on bulky or heavy items
Damage guarantee: if it arrives damaged we replace or refund it, with no photo-proof fight
30-day returns
Real people on the phone: 1-800-680-4080, 875 Industrial Hwy, Unit 8, Cinnaminson, NJ 08077

Explore related products

Compare our portable power station options and foldable solar panel kit. Confirm input voltage, connector type and charging wattage before pairing equipment; compatibility is not guaranteed.

WHAT THIS SOLAR PANEL IS FOR

A briefcase-style 40W panel for keeping a 12V battery topped up

Batteries that sit between trips lose charge, and a dead battery at the start of a trip is a ruined weekend. This 40W monocrystalline panel folds like a briefcase and is built for 12V battery charging, which makes it a practical way to maintain an RV, camping or off-grid battery between uses.

Right for you if…

You maintain a 12V battery for an RV, camper or off-grid setup
You want a compact, briefcase-style panel that is quick to set up
You want to keep a battery topped up between trips

Look at something else if…

You want to charge a large battery bank quickly
You need USB charging for personal devices directly

What one clear day of sun gives you

A 40W panel with about four hours of strong sun typically yields roughly 120Wh after real-world losses.

Smartphone chargesabout 8
Laptop (about 60W)about 2.0 hours
LED lamp (about 10W)about 12.0 hours

Rough estimates using typical device wattages. Real results vary with the device, temperature, sunlight and battery age.

If you pair it with one of these power stations

Hours of strong sun to refill from empty, if the connector and solar input are compatible (about 75% of rated watts):

Good to know about this one

A panel should not connect straight to a battery. A charge controller sits between them to prevent overcharging. This panel's description does not list a controller, so make sure your setup has one, or choose the 60W or 150W kit, which include controllers.

Plan before you need it

Solar works on the sun's schedule. Winter days are shorter and the sun sits lower, so panels produce less than in summer. If solar is part of your outage or off-grid plan, order the panels together with the battery or power station they will charge, and confirm the connector fits before the weather turns.

If this is not quite the right fit

GridGuard 60W Foldable Solar Panel Kit with Controller $32.99 Want a charge controller included? GridGuard 100W Foldable Solar Panel Kit, Monocrystalline $20.99 Need more output (100W)?

Not sure this is the right size for you? Tell us what you want to power and for how long, and we will check it against this product before you order. Contact us or call 1-800-680-4080.