Keeping it Cool- 240v vs 12v fridge showdown! Real World use!

Hey Roamers, Luke here from Suffolk, diving into the world of off-grid electrics. As someone who's been using and installing Lithium setups for over a decade now, I see a common question come up time and time again- 12v fridge or 140v fridge? Which is better? Now when this pops up on Facebook groups the "opinions" are heavily divided, and most people are just regurgitating what they have heard- or they are justifying their expensive purchase!

Conventional wisdom says 12V fridges are more efficient for off-grid because they skip the inverter losses. But my real-world research flipped that on its head—the 240V setup came out on top! Let's break down the setup, results, and why this might change how you think about your build in 2026.

Spoiler! I have been a big supporter of 240v fridges for off grid setups for quite some time and I have used these in my own builds. My fully off grid 1970 campervan in Australia had a 240v bar fridge (under counter fridge) Our Ford transit Jumbo Campervan build here in the UK has a 240v 252l Fridge/Freezer and so when we purchased our Princess 37 Motorboat in 2025 and started the refit- of course it was getting a 240v Fridge.

Now here is the good side for you - our boat came equipped with a Dometic 80ltr 12v fridge and because my partner Zoe is gorgeously excessive! We have kept it in place while installing a 252ltr 240v fridge right next to it. So yes this comparison is real world FACTS! In the same test environment, Monitored by yours truly.

My Test Setup: Keeping It Real for UK Van Life

I ran both fridges in my van during typical British summer conditions (ambient temps around 18-25°C), and have been using them actively. The 12v fridge actually gets opened less as its more of a drinks and overflow storage, whilst the 240v fridge is our go to.

My power system is a 12v Fogstar 608ah Lithium Battery (608Ah total) charged via Shore Hookup when needed. I've been monitoring direct usage of the 2 fridges, so can give real figures.

• 240V Side: The Fridgemaster 252L (a budget-friendly, energy-efficient household model with A+ rating) connected to a Renogy 1000W pure sine wave inverter. The inverter has a low standby draw of 1amp (however I monitor it at 1.1amps), but I factored it in. This fridge is larger, 3 times the size of the Dometic CRX80 great for stocking up on groceries for longer trips.

  
  

• The fridge can be purchased for around £250 on offer, and weighs 35KG

  
  

• The Renogy 1000w Inverter only services the fridge and other light loads (charging laptops etc) and has a 90% conversion efficiency.

• 12V Side: The Dometic CRX80, a 80L compressor fridge designed for vans—compact, with good insulation and a Danfoss compressor. It's a popular choice for its direct DC efficiency.

• The CRX80 can be purchased for around £800 - £1000 depending on offers, and weighs 20kg

  
  

  I have tested Long term over the last few months, averaging data to account for variables like ambient temp and usage.

  
  

The Results: 240V Edges Out 12V on Efficiency

Here's the data: My measurements showed the 240V Fridgemaster setup using less power overall:

• 240V Fridgemaster via Inverter: Average draw of 1.8 amps per hour (that's about 43Ah over 24 hours). This includes a constant 1.1 amp for the inverter's standby when the fridge isn't cycling. Without standby, the fridge itself pulled around 0.8A effective.

• 12V Dometic CRX80: Average draw of 2.7 amps per hour (about 65Ah daily). It cycled more frequently, likely due to its smaller size and insulation differences.

  
  

Why amps per hour? It's the average current draw, factoring in duty cycle (on/off time). In practice, this means the 240V setup saved me about 22Ah per day—enough to run lights or a fan longer if needed.

Here's the snapshot:

• Capacity: 252ltr VS 80ltr

• Weight 35kg vs 15kg

• 24hr usage 43amps vs 65amps

• Replacement cost: £250 vs £900 (approx)

Why Is the 240V More Efficient? Digging Into the Data

You'd expect inverter losses (10-20% typically) to make the 240V less efficient, but here's what tipped the scales:

1. Base Efficiency of Household Fridges: The Fridgemaster is optimized for low energy use (rated at ~200-250kWh/year), with a more powerful compressor that cycles less often. In my tests, its duty cycle was around 20-30%, versus the Dometic's 40-50%.

2. Inverter Standby Managed Well: The Inverter plays a big role here, generally the smaller the inverter the lower the Standby draw. I opt for 1000w inverters as they generally draw around 1ah standby where as my 3000w inverter has a standby draw of near 2amps. This larger one I have on remote and cycle on and off as needed for larger electric use like Induction hobs and Air fryers.

3. Size and Insulation: The larger 252L Fridgemaster holds cold better once chilled, reducing cycles. The CRX80, while van-optimized, is smaller and lost more cold with openings.

4. Real-World Variables: I have used this setup in 40c + temperatures in Australia, and -0c Temperatures here in the UK and in every condition - the 240v fridge wins!

   
   

Bottom line: Total system efficiency matters more than just avoiding inversion. My data shows a well-chosen 240V fridge + efficient inverter can outperform a 12V model, especially for bigger capacities!

Pros and Cons: Which Is Right for Your Build?

Here's a balanced comparison table based on my experience:

Aspect	240V Fridgemaster + Renogy Inverter	12V Dometic CRX80
Average Draw (A/h)	1.8 (incl. 1.1A standby)	2.7
Daily Ah Usage (est.)	43Ah	65Ah
Capacity	252L (great for families/groups)	140L (compact for solo/duo)
Upfront Cost	Fridge £200-300 + Inverter £150	£800-1000 (premium build)
Efficiency Off-Grid	Surprisingly better in my tests	Good, but higher draw observed
Installation	Needs inverter wiring; bulkier	Simple direct 12V; vibration-proof
Reliability	Inverter adds a failure point	Rugged for roads; auto DC/AC switch
Best For	Budget, high-capacity, mild climates	Weight limits

Final Thoughts: Rethink Your Fridge Choice for 2026 Van Builds

My research proves that a 240V household fridge like the Fridgemaster, paired with a solid inverter like the Renogy 1000W, can be more efficient than expected—beating the Dometic CRX80 by about 30% in power use! This is huge for extending off-grid time on limited solar in the UK.

Want to get more efficient? Take a look at 240v Fridges with the thermostat hooked up to fire a relay to turn the inverter on and off as needed, which saves the standby draw of the inverter all together! Or you can look at spending bigger on Inverters with Eco mode and lower standby draw, but that's for another post!

That said, results can vary by model, climate, and usage. If you're full-time off-grid, test your own setup! I'm sticking with the 240V for now—more beer space, less battery worry.

What about you? Have you run similar tests? Share in the comments—let's geek out on van electrics. Safe travels, Luke 🚐❄️