Battery and Solar Guide for 50L Canopy Fridges

Intro
Plan from real numbers and you’ll avoid flat batteries. Here’s a simple framework to size lithium, solar, and charging for a 50L 12V fridge in a ute canopy.

Work From the Spec

• Check the label - note average amps or watts during typical use.
• Estimate daily energy - watts × hours of run time. Allow extra for summer and frequent openings.
• Aim for margin - size for your hottest likely conditions.

Lithium Battery Sizing

• 100Ah lithium - common starting point for weekenders.
• 150Ah to 200Ah - gives more buffer for multi-day off-grid and accessories.
• Battery monitor - track state of charge so you know what’s really happening.

Solar Input

• Fixed canopy panels - charge while parked and on the move.
• Portable blankets - chase the sun at camp, 160W to 300W is common.
• Regulator - use a quality MPPT sized for your array.

Alternator Charging

• DC-DC charger - consistent charge to lithium from the vehicle while driving.
• Correct cable size - minimise voltage drop from engine bay to canopy.
• Fusing - protect both ends of long runs.

Efficiency Tips

• Pre-chill food and drinks.
• Use a thermal cover if supplied by the manufacturer.
• Keep the compressor end ventilated and out of direct radiant heat.

Bottom line
Match battery and solar to real usage, then add headroom. With sensible setup, a 50L canopy fridge runs happily day after day.

See 50L fridges and power options