Flexopower FlexoSun 400W Portable Solar Panel | TOPCon Technology | 26% Efficiency | Teflon
SKU KALA400
R12 173.04
Extension
Please choose
Customer reviews
Reviews only from verified customers
No reviews yet. You can buy this product and be the first to leave a review.
Save this product for later
Flexopower FlexoSun 400W Portable Solar Panel | TOPCon Technology | 26% Efficiency | Teflon
Product Details
[tab name='Product Description']
FlexoSun 400W Portable Solar Panel | TOPCon Technology | 26% Efficiency | Teflon
Maximum solar power. Extended off-grid freedom. Built for bigger adventures.
The Flexopower FlexoSun400W is the largest portable solar panel in the FlexoSun range and the natural successor to the Kalahari400W.
Featuring advanced TOPCon monocrystalline solar cell technology with a cell efficiency of at least 25.8%, a durable Teflon surface coating and IP67 protection, the FlexoSun400W delivers powerful solar charging for demanding off-grid applications.
Its high-voltage (HiVolt) design delivers 400W of rated solar output at an operating voltage of 34.3V, making it particularly well suited to larger portable power stations, lithium battery systems and compatible multi-panel solar installations.
The glass-free aluminium frame construction combines durability with portability, while the foldable design and included padded carry bag make transport and storage convenient.
Which solar panel do I need?
Guidelines based on 20 years of real customer feedback.
| Load type | How long? | Your panel |
|---|---|---|
| Standard load Fridge + lights | Weekend | FlexoSun165W or Karoo230W |
| Standard load Fridge + lights | 3+ days | FlexoSun260W |
| Heavy load 2 fridges + lights + water pump | 2–3 days | FlexoSun260W |
| Heavy load 2 fridges + lights + water pump | 3+ days | Kalahari400W |
| Extra heavy Ice maker + 2 fridges + A/C | Any duration | 2× Kalahari400W |
Guidelines only. Subject to individual usage behaviour and available sun.
Panel in the sun. Camp in the shade.
Key Features
- 400W solar output — High-capacity portable solar charging for demanding off-grid applications.
- Advanced TOPCon technology — Monocrystalline solar cells with a cell efficiency of at least 25.8%.
- HiVolt design — Operating voltage of 34.3V for efficient power transfer to compatible MPPT solar charging systems.
- Teflon surface coating — Durable protection for demanding outdoor conditions.
- IP67 protection — Dust-tight and protected against temporary water immersion under specified test conditions.
- Glass-free construction — Durable aluminium frame without conventional glass panels.
- Compact folding design — Folds down for convenient vehicle storage and transport.
- Anderson SB50 grey connector — Pre-fitted with red and black 4mm² cable.
- Collapsible supporting legs — Position the panel at a 45° angle for improved solar collection.
- Padded carry bag included — Protects the panel during storage and transport.
- Individual serial number — Every panel is traceable through manufacturing and quality control.
- 5-year warranty — Backed by Flexopower.
Advanced TOPCon Solar Cell Technology
- TOPCon (Tunnel Oxide Passivated Contact) is an advanced generation of monocrystalline solar cell technology designed to improve energy conversion and solar performance.
- The FlexoSun400W uses high-efficiency TOPCon solar cells to deliver powerful solar charging in a portable folding design.
- Cell efficiency of at least 25.8%
- Efficient energy collection
- Improved low-light performance
- Improved performance at elevated temperatures compared to conventional PERC cells
- Higher energy output relative to solar cell surface area
HiVolt Solar Panel Design
- The FlexoSun400W features a high-voltage design with an operating voltage of 34.3V and an open-circuit voltage of 38.8V.
- Higher operating voltage allows power to be transferred at a lower current than an equivalent lower-voltage system, helping reduce cable-related energy losses.
- This makes the FlexoSun400W particularly suitable for:
- Larger portable power stations
- Compatible MPPT solar charge controllers
- Extended solar extension cable runs
- High-capacity lithium battery systems
- Compatible multi-panel solar installations
- Please note: Always verify the maximum solar input voltage, current and power ratings of your charge controller or portable power station before connecting. Allow for increased open-circuit voltage in cold weather.
IP67 Protection
- The FlexoSun400W features an IP67-rated design, providing excellent protection against dust and temporary water immersion under specified test conditions.
- Combined with its durable Teflon surface coating and glass-free aluminium frame construction, this makes the panel suitable for demanding outdoor environments encountered during camping, overlanding and off-grid field work.
- Electrical connections should always be protected from water exposure.
Compact and Portable Design
- Despite its impressive 400W rated output, the FlexoSun400W folds down for convenient storage and transport.
- Folded dimensions: 900 × 590 × 90mm
- Deployed dimensions: 2,360 × 900 × 25mm
- Weight: 10kg
- Integrated support legs: 45° positioning
- Padded carry bag: Included
- The glass-free aluminium frame provides a practical combination of durability, portability and high solar output.
How to Use It
Position the panel
- Place the FlexoSun400W in direct sunlight and use the integrated supporting legs to angle the panel towards the sun. Reposition it throughout the day where practical and avoid partial shading.
Connect to a portable power station
- Connect the panel to a compatible portable power station using a suitable FlexoLink solar extension cable.
- A separate solar charge controller is not required when the power station features a compatible integrated MPPT solar charge controller.
Connect to a conventional battery system
- The panel can also be connected to a correctly specified MPPT solar charge controller for charging a conventional deep-cycle or lithium battery system.
- Never connect the solar panel directly to a battery.
Connect multiple solar panels
- Multiple FlexoSun400W panels can be connected using suitable series or parallel connectors, provided the combined electrical output remains within the limits of the receiving equipment and all connecting components.
Recommended Extension Cable
- For efficient power transfer over longer distances, consider the FlexoLink 15m 6mm² Low Voltage-Drop Solar Extension Cable with Anderson SB50 grey connectors.
- The larger cable cross-section helps reduce electrical resistance and voltage drop, making it particularly suitable for extended cable runs.
- Please note: Solar extension cables, external charge controllers and adaptors are sold separately.
Real-World Solar Performance
- Actual solar output will vary depending on environmental conditions and installation.
- Factors affecting solar performance include:
- Sunlight intensity
- Time of year and geographic location
- Panel orientation and angle
- Partial shading
- Panel cleanliness
- Solar cell temperature
- Weather conditions
- When the connected battery approaches full charge, the power station or charge controller may automatically reduce the power drawn from the solar panel. This is normal and does not indicate a fault.
What's in the Box
- 1 × FlexoSun400W Foldable Solar Panel
- Pre-fitted Anderson SB50 grey connector with 4mm² lead wire
- Integrated collapsible supporting legs
- 1 × Padded Carry Bag
Ideal For
- Extended camping and remote bush trips
- Overlanding and 4x4 adventures
- Caravans and motorhomes
- Off-road trailers
- Large portable power stations
- High-capacity lithium battery systems
- Fridge and freezer setups
- High daily energy demands
- Compatible multi-panel solar arrays
- Off-grid field work
- Upgrading from Kalahari300W or Kalahari400W solar panels
[tab name='Specifications']
Specifications
| Specifications | Detail |
|---|---|
| Brand | Flexopower |
| Product Range | FlexoSun |
| Model | FlexoSun400W |
| Rated Output (STC) | 400W |
| Output Tolerance | ±5% |
| Solar Cell Technology | TOPCon Monocrystalline |
| Solar Cell Efficiency | ≥ 25.8% |
| Surface Coating | Teflon |
| Voltage Configuration | HiVolt |
| Open-Circuit Voltage (Voc) | 38.8V |
| Maximum Operating Voltage (Vmp) | 34.3V |
| Short-Circuit Current (Isc) | 12.5A |
| Operating Current (Imp) | 11.7A |
| Maximum System Voltage | 200V DC |
| Protection Rating | IP67 |
| Construction | Glass-Free Aluminium Frame |
| Panel Design | Foldable |
| Deployed Dimensions | 2,360 × 900 × 25mm |
| Folded Dimensions | 900 × 590 × 90mm |
| Connector | Anderson SB50 Grey – 50A |
| Cable Cross-Section | 4mm² |
| Cable Colour | Red / Black |
| Collapsible Support Legs | Yes – 45° |
| Individual Serial Number | Yes |
| Padded Carry Bag | Included |
| Weight | 10kg |
| Warranty | 5 Years |
[tab name='FQA']
Frequently Asked Questions
Does the FlexoSun400W require a separate solar charge controller?
- No, when connected to a compatible portable power station with an integrated MPPT solar charge controller.
- For conventional battery systems, a correctly specified external MPPT solar charge controller is required.
What is TOPCon solar cell technology?
- TOPCon stands for Tunnel Oxide Passivated Contact. This advanced monocrystalline solar cell technology provides high cell efficiency, improved low-light performance and better performance at elevated temperatures compared to conventional PERC cells.
What does HiVolt mean?
- HiVolt refers to the panel's higher operating voltage of 34.3V. This allows efficient power transfer to compatible MPPT solar charging systems while helping reduce cable-related energy losses.
Is the FlexoSun400W waterproof?
- The FlexoSun400W is IP67-rated, meaning it is dust-tight and protected against temporary water immersion at a depth of up to 1 metre for 30 minutes under specified test conditions. Electrical connections should always be protected from water exposure.
How does the FlexoSun400W compare to the FlexoSun260W?
- The FlexoSun400W delivers approximately 54% more rated solar power, making it better suited to larger power stations, extended off-grid trips and higher daily energy demands.
- The FlexoSun260W is lighter and more compact, making it ideal for setups where storage space and weight are important considerations.
Which extension cable is recommended?
- The FlexoLink 15m 6mm² Low Voltage-Drop Solar Extension Cable with Anderson SB50 grey connectors is a suitable option for efficient power transfer over longer distances.
Can I use this panel with other brands of power stations?
- Yes, provided the power station's solar input voltage, current, power limits and connector polarity are compatible. Pay particular attention to the panel's 38.8V open-circuit voltage and the potential increase in voltage during cold weather.
Can I connect multiple FlexoSun400W solar panels together?
- Yes, using suitable series or parallel connectors, provided the combined voltage, current and power remain within the electrical limits of your charge controller, power station and connecting components.
Will the panel always produce 400W?
- No. The 400W rating is measured under standard test conditions. Actual output depends on sunlight intensity, panel temperature, orientation, weather conditions and the connected equipment.
How many days off-grid will the FlexoSun400W support?
- With sufficient sunlight and a correctly sized battery system, the FlexoSun400W can support extended off-grid adventures. The actual duration depends on your daily power consumption, available sunlight and battery capacity.
Is each solar panel individually traceable?
- Yes. Every FlexoSun400W features a unique serial number for manufacturing traceability, quality control and after-sales support.
Is a carry bag included?
- Yes. A padded carry bag is included for convenient storage and transport.
Is a solar extension cable included?
- No. FlexoLink solar extension cables, external charge controllers and adaptors are sold separately.
What warranty applies?
- The Flexopower FlexoSun400W Portable Solar Panel carries a 5-year warranty.
New-generation solar technology. Maximum portable solar power. Adventure without limits.
[endtab]
You May Also Like
On Sale
Victron SmartSolar MPPT 100/30 Solar Charge Controller
Victron SmartSolar MPPT 100/30 Solar Charge Controller
SKU SCC110030210
was R2 475.00
R1 969.57
Display prices in:ZAR
