Tech Tip Tuesday: Why Don’t We Have a 12V + Propane Absorption Refrigerator?
Welcome to another Tech Tip Tuesday, brought to you by the National RV Training Academy (NRVTA)—the largest hands-on RV training academy in America! Today, we’re tackling a great question from one of our viewers: Why isn’t there a 12V + Propane absorption refrigerator? It sounds like a solid idea, but let’s break it down.
The Idea Behind a 12V + Propane Absorption Fridge
The logic behind a 12V + Propane absorption fridge is simple:
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When on shore power, the 12V system could run off the batteries and converter.
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While driving, the battery and tow vehicle alternator could keep the fridge running, eliminating the need for an open propane flame.
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When boondocking, the fridge could switch to propane, saving battery power.
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Yes, it would increase the cost by 25-35%, but compared to lithium battery costs, that’s not a huge price to pay.
Sounds great, right? Well, here’s why it’s not common.
Current RV Refrigerator Options
1. Three-Way Absorption Refrigerators
A three-way absorption fridge already exists! These refrigerators can operate on: ✔ 120V shore power
✔ Propane
✔ 12V heating element (typically used while driving)
However, absorption refrigerators rely on heat to facilitate cooling—whether from 120V, propane, or a 12V heating element. The problem? 12V heating elements require a lot of power, far more than a 12V compressor fridge.
2. 12V Compressor Refrigerators
A 12V compressor fridge works more like a residential fridge but is designed for RV use. These fridges: ✔ Run entirely on 12V DC power
✔ Use a compressor instead of absorption cooling
✔ Are highly energy-efficient, consuming around 200W per hour
If you’re boondocking, a couple of 200W solar panels can power your fridge during the day. But if you want a propane backup, things get tricky.
Why Isn’t a 12V + Propane Absorption Fridge Common?
The main issue is energy efficiency:
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A 12V compressor fridge is efficient, drawing about 200W per hour.
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A 12V heating element for an absorption fridge draws 400-500W per hour—way too much for most battery setups.
Technically, a 12V absorption fridge that also runs on propane could be built, but it wouldn’t be practical due to the high power draw. This is why the two main choices remain: ✔ Three-way absorption fridges (for propane backup)
✔ 12V compressor fridges (for energy efficiency and solar compatibility)
Best Choice for Your RV?
🔹 If you want propane backup: Go with a three-way absorption refrigerator.
🔹 If you prefer energy efficiency and plan to use solar: A 12V compressor fridge is your best bet.
It’s always exciting to see innovative ideas in RV technology! Keep your Tech Tip Tuesday questions coming, and we’ll continue to break down the best tech for your RV life. 🚐💡
For more hands-on RV training, visit www.nrvta.com!