We’ve had our share of issues with the 12V DC Compressor fridge installed in our Northstar Liberty truck camper. Our biggest issue has been with the door latch and vents. People have asked many questions about the fridge and we wanted to attempt to cover everything in this video.

How much power does it take?
It draws ~ 5amp DC while the compressor is running. Run time is based on external temperature, internal set temperature, air space inside (more air = less efficient) and door being opened or closed. Assuming the compressor run 20mintues per hour @ 5amps per hour… You’re looking at ~40AH of power per 24hrs. But that number could double to 80AH in HOT weather and frequent door opening. In general, we typically see 20-30amp power drop overnight (including all power uses lights, phone chargers, water pump).

What size battery is recommended?
This depends on your other power needs. We primarily use DC power (no power inverter). 100AH lithium (or 200ah AGM or Lead Acid) battery would be workable for most. But you’d need to recharge within ~24-36hrs. We have 200AH Lithium and power has never been an issue or concern (year round). However, our recent 2,000watt power inverter for charging our e-bikes drastically increased our power usage (especially charging overnight with zero solar).

How much solar do you need?
It depends. 100watt solar panel may produce up to 30AH per day. This is assuming 5+ hours of peak sun (no clouds, no shade). You “may” be able to operate a DC fridge with only 100watts solar in ideal summer conditions with limited or no additional power draws. Our Four Wheel Camper had 200watts of solar with the DC fridge. It was functional in the summer months being careful. It was not good if cloudy, shaded or in the winter. Often the battery would become depleted. Tilting solar panels will help (in the winter) but it’s a hassle (not worth it). My recommendation is 4 to 1 ratio: 400watts of solar for 100AH battery. We run 200AH Lithium batteries with 800watts solar. This ratio generally ensures worry free charging year round in most weather conditions. An alternative charging method like a DC Charger is a good idea (especially when it snows).
We also cover many additional concerns in the video such as proper venting, door latch solution and various comparisons between a Propane absorption 3 way fridge to 12V DC compressor Fridge.

Comment and share things you’ve learned or post any questions you have.

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