Bypass Diode Shade Safe
FOSSiBOT SP400 Pro Bifacial Portable Solar Panel (400W)
- 2‑Year Warranty: Backed by a 2‑year warranty for peace‑of‑mind purchase and worry‑free usage.
- Lightweight & Fold‑for‑Portability: 36% lighter than its predecessor, weighing only 9 kg complete with the stand, for effortless transport and quick setup.
- Smarter Bypass, Shade Safe: Integrated bypass diodes stop overheating if parts of the solar panel get covered by shade.
- 25% Conversion Efficiency: Engineered with advanced solar cells that minimise energy loss while performing in high temperatures — delivering more power, faster, even in demanding conditions.
- Up to 10%‑15% More Power with Dual‑Sided Output: Dual‑side sunlight capture boosts energy output on reflective surfaces such as snow, sand and concrete.
- Never Worry About Extreme Conditions: Built to endure extreme temperatures from ‑10℃ to 70℃ (14℉ to 158℉), and rated IP67 dust‑ and water‑resistant.
- Aluminum Frame: Built to last with a reinforced aluminium frame and impact‑resistant materials that withstand bumps and rough handling.
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FOSSiBOT SP400 Pro Bifacial Portable Solar Panel
Lighter. Smarter. Stronger.
Aluminum Frame
25% High Solar Conversion
Lightweight & Foldable
9kg/19.8 lbs
9kg/19.8 lbs
400W Peak Power
Bifacial Solar Panel
IP67 Protection
Light Comes from Both Sides
Captures direct sunlight from the front and reflected light from the rear, adding 10–15% more light.
7.21%
Grass
9.54%
Cement
9.84%
Sandy Land
14.83%
Snow
24.85%
Mirror
25% High Conversion Efficiency
High-efficiency cells make better use of the sunlight you get.
Open Circuit Voltage
39.1V
Peak Power
400W
*Under typical weather conditions, actual power ranges from 70% to 85% of peak rating.
Aluminum Frame. Better Protection
Reinforced aluminum and protected corners stand up to bumps and rough handling.
Thick Plastic Corner Guards
Aluminum Frame
Layered to Perform
FOSSiBOT SP400 Pro
Other
Only 19.8 lbs. Easy to Carry
The new SP400 Pro is 36% lighter than the previous SP420, making it easier to carry and store.
Net weight:
9kg (19.8 lbs)
Folded Size:
691*790*87.4mm
Unfolded Size:
2765*790*21.4mm
Net weight:
9kg (19.8 lbs)
Folded Size:
691*790*87.4mm
Unfolded Size:
2765*790*21.4mm
Smarter Bypass. Shade Safe
Bypass diodes help prevent overheating when part of the panel is shaded.
Stable 35° Angle for Any Terrain
The fixed stand stays steady on grass, gravel, and uneven ground.
IP67 Panel with Sealed Connectors
Dust and water resistant, making it well suited for outdoor use.
Waterproof MC4 Connector
Works with 90% of Power Stations
Standard MC4 connectors work with most compatible portable power stations.
F1800 (1024Wh)
1 x SP400 Pro
≈ 3.41 Hrs
F2400 (2048Wh)
1 x SP400 Pro
≈ 6.83 Hrs
F3600 Pro (3840Wh)
4 x SP400 Pro
≈ 3.2 Hrs
F7200 (5222.4Wh)
6 x SP400 Pro
≈ 2.9 Hrs
More Panels. More Power
1
Locate the PV ports behind your solar panel.
2
Use an extension cable to connect the PV ports to the PV connector-to-XT60 solar charging converter.
3
Connect the solar charging converter to the XT60 port on your power station.
Note: Ensure the cables are connected to their opposing charge, excluding the XT-60 port.
How to Connect
Connect panels in series or parallel to expand your solar setup.
Charge the portable power station
Connect in series
Connect in parallel
Power Your Life, Power Your Adventure
RV Trip
Camping
Fishing
Power Outage Essentials
-10°C to 70°C. Ready for the Outdoors
Reliable performance across a wide range of outdoor temperatures.
What's in The Box
SP400 Pro Portable Solar Panel
User Manual
Portable Solar Panel Bag
MC4-XT60 Solar Charging Cable(1.5M)
New Generation vs Previous Generation
FOSSiBOT SP400 Pro Bifacial Portable Solar Panel
FOSSiBOT SP420 Portable Solar Panel
Conversion Efficiency
25% ↑
Conversion Efficiency
23.4%
Solar Capture
Double-Sided ↑
Solar Capture
Single-Sided
Hotspot Protection
Anti-hotspot technology
Hotspot Protection
--
Weight
19.8 lbs ↓
(9kg)
Weight
30.79lbs
(13.97kg)
Frame
Aluminum Frame
Frame
Standard Frame
Working Temperature
-10°C to 70°C ↑
Working Temperature
-10°C to 65°C
Folded Size
691*790*87.4mm ↓
Folded Size
1036*550mm
Unfolded Size
2765*790*214mm ↓
Unfolded Size
1036*2231mm
PREVIEW
POWER
Model:
Max Power at STC:
Panel Type:
Conversion Efficiency:
Voltage at Max Power(Vmp):
Current at Max Power(Imp):
Open Circuit Voltage(Voc):
Short Circuit Current(Isc):
GENERAL
Connector:
Weight:
Dimensions (Unfolded):
Dimension (Folded):
Operating Temperature:
Number of Panels:
Warranty:
In The Box
FAQ
Q: Why is the actual power output lower than the rated power?
The rated power is measured under Standard Test Conditions (STC), which are ideal laboratory conditions used to compare solar panels. Actual output may be lower due to sunlight intensity, temperature, panel angle, shading, weather conditions, and cable losses.
Q: Why is the solar output low even on a sunny day?
Solar panels rely on sunlight, not heat. High panel temperatures can reduce output even in strong sunlight. Good ventilation and avoiding unnecessary heat buildup can help maintain better performance.
Q: Why does the solar power change during charging?
This is normal. Solar input can fluctuate due to changes in sunlight, clouds, temperature, shading, and panel angle.
Q: How can I get the maximum charging power from my solar panel?
Place the panel in strong, direct sunlight, point it toward the sun at a suitable angle, and avoid any shading. Make sure all connectors and cables are securely connected and that your power station supports the panel's output.
Q: How do I know if the solar panel is compatible with my power station?
Check your power station's solar input voltage, current, and maximum power specifications. The panel's output must stay within these limits. Having the same MC4 connector does not necessarily mean the devices are compatible.
Q: Can I charge and use my power station at the same time?
Yes. A compatible solar panel can charge your power station while the power station is supplying power to connected devices.
Q: Why is my power station still losing battery while solar charging?
This happens when your devices are using more power than the solar panel is generating. For example, if the panel provides 100W while connected devices consume 150W, the battery level will continue to decrease.
Q: Can I use the solar panel with an extension cable?
Yes. However, longer cables can cause additional power loss. Use a compatible cable with the proper specifications and keep the cable as short as practical.
Q: Can solar input overload my power station?
Always make sure the combined solar voltage, current, and power remain within your power station's input limits. The MPPT controller can manage excess power and current within its rated range, but it cannot reduce excessive input voltage. Never exceed the maximum solar input voltage.
Q: Why isn't my solar panel charging my power station?
Check the MC4 connectors, cables, sunlight conditions, and whether the panel's voltage and current match your power station's solar input requirements. Try reconnecting the solar cable or restarting the power station. You can also test AC or car charging to confirm whether the power station itself is operating normally.
Q: What is hotspot protection?
Hotspot protection helps reduce excessive heat caused by partial shading. Integrated bypass diodes allow current to bypass shaded sections of the panel, helping reduce heat buildup, protect the solar cells, and maintain more stable performance.
Q: Can solar panels generate power on cloudy days?
Yes. Solar panels can still generate electricity in cloudy conditions, but the output will usually be lower than under strong, direct sunlight.
Q: How do I check if SP400 Pro works with my power station?
Verify the power station’s max solar input voltage, current and power.
SP400 Pro electrical specs:
- Vmp: 32.6 V
- Voc: 39.1 V
- Imp: 12.3 A
- Isc: 12.5 A
All panel parameters must fall within the station’s input limits. MC4 connector matching does not guarantee compatibility.
Q: Can I use the solar panel in hot or cold weather?
Yes. Our solar panels are designed to operate from -10°C to 70°C (14°F to 158°F). However, very high temperatures may reduce solar output even when sunlight is strong.