300W 12V Monocrystalline Fixed Solar Panel

This StarPower 300W 12V monocrystalline fixed solar panel is a compact framed option for compatible caravan, RV, 4WD, shed, cabin and off-grid battery-charging systems.

Check before ordering: the panel measures 930 × 540 × 50mm and weighs approximately 9.5kg. Confirm the mounting area, structural support and controller capacity for 21.4V open-circuit voltage and 18.27A short-circuit current.

Compare alternative constructions and sizes in StarPower’s main 300W solar panel range.

Key Features

• 300W rated peak power under standard test conditions
• Monocrystalline solar cells
• Rigid aluminium frame and tempered-glass front
• Compact footprint for suitable mobile and off-grid installations
• Compatible with lithium LiFePO4, AGM and deep-cycle battery charging when used with the correct controller

Technical Specifications

• Rated Power: 300W
• Power Tolerance: ±3%
• Maximum Power Voltage (Vmp): 17.4V
• Maximum Power Current (Imp): 17.24A
• Open Circuit Voltage (Voc): 21.4V
• Short-Circuit Current (Isc): 18.27A
• Maximum System Voltage: 1000V
• Cell Technology: Monocrystalline
• Module Class: Class A
• Operating Temperature: -40°C to 85°C
• Certification: TÜV listed in the product specifications
• Performance Warranty: 25 years
• Dimensions: 930 × 540 × 50mm
• Weight: approximately 9.5kg
• Model: SPAST-300WMS

Suitable Applications

• Caravan and RV roof systems with suitable mounting support
• 4WD canopies and camper trailers
• Sheds, cabins and remote 12V battery systems
• Ground-mounted off-grid arrays

Controller and Battery Compatibility

Use a controller, DC-DC charger with solar input, or compatible hybrid inverter that can safely accept the panel’s voltage and current. The charging profile must suit the battery chemistry. Compare MPPT solar charge controllers and lithium batteries.

For multiple panels, recalculate the complete array: series wiring increases voltage and parallel wiring increases current. Use appropriately rated solar cable, connectors, fuses and isolation equipment.

What’s Included

• 1 × 300W 12V monocrystalline fixed solar panel

Mounting hardware, extension leads, controller, fuses, isolators and battery are not included unless stated separately in the offer.

Installation Notes

Provide secure structural support and follow the mounting instructions. Plan for cable routing, waterproof entries, service access and airflow around the panel. Vehicle, marine and permanent electrical work should be completed by a suitably qualified installer where required.

Real-World Output

The 300W rating is measured under standard test conditions. Actual output varies with sunlight, panel temperature, shade, angle, cleanliness, cable losses and controller efficiency.

FAQs

Can this panel charge a lithium battery?

Yes, when connected through a compatible controller with the correct lithium charging profile and sufficient PV input capacity.

Is 300W enough for a caravan fridge?

It depends on the fridge’s daily energy use, battery capacity, other loads, location and season. Size the complete system from measured or manufacturer-stated watt-hours rather than panel wattage alone.

Is a controller included?

No controller is listed as included with this panel. Select a compatible controller separately if your system does not already have one.