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Old 05-06-2021, 17:49   #1
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Zero Breeze Mark 2 air conditioner

I thought long and hard and then pulled the trigger on one of these + two batteries. It arrived this week and I used it for the first time today.

It seems everyone who wants air conditioning on their boat focuses on adding more generator, more solar, more batteries. I decided to go the other way, focus on an a/c unit that uses as little power as possible. As far as I can find, Zero Breeze is the only battery powered air conditioner there is. Not a swamp cooler, but a true a/c unit. It's not cheap, although still significantly cheaper than installing a normal marine a/c unit. It was designed for people going camping but I figured it would work on boats. It was easy to set up and use, even without reading the instructions first.

It works as advertised, but there are strengths and weaknesses. It was designed for a tent or a cabin. It won't cool down a large yacht. My boat is 36' and it handles that alright, but a single cabin would be better. It was also bigger and heavier than I expected. The photos on their site show people carrying around while camping, but it weighs almost 30lbs together with battery.

Unlike marine a/c systems, it doesn't use a water intake & exhaust, instead it does it through the air. Which means you have to set it up for the exhaust to go through one of your portlights. That's a little awkward, and I'm still trying to find out the best place to place it on my boat. But the good news is that it comes with several foam templates that you can easily cut to fit a window. I attached a photo of my first attempt setting it up, letting the water drain into the sink (it comes with a little hose so you can drain it where you want). I could instead put the unit outside in the cockpit and run a hose blowing cold air into the inside, but it would have to be protected from rain.

You can plug it into 120v shore power outlet, but if you want to plug it into a 12v outlet, you need to buy a separate adapter for $99, which sucks. But then again it's a 24v system, so people who set up their boat on 24v might be able to rig it directly. On batteries, it's supposed to run from 3-5 hours. For me it ran about 3 hours on maximum cool setting. The batteries are expensive but substantial, and have USB ports to charge other devices (24v 35Ah/840Wh)

One pleasant surprise is that it pulls moisture from the air so it drains the water out the back. In other words, it's also functions as a low power water maker in humid environments. It made me about a coffee mug full of water per hour.

  • It quickly cools
  • Easy to use
  • It creates fresh water
  • Runs very quietly
  • The batteries are useful to charge other things

  • No heat, just a/c
  • Works in a limited area
  • Awkward to set up in a boat
  • If you want to plug it into 12v you need to buy an adapter
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Old 07-06-2021, 05:23   #2
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Re: Zero Breeze Mark 2 air conditioner

Very interesting, thanks for the review.
Twenty years from now you will be more disappointed by the things that you didn't do than by the ones you did do. So throw off the bowlines. Sail away from the safe harbor. Catch the trade winds in your sails. Explore. Dream. Discover. Mark Twain
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Old 10-06-2021, 20:20   #3
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Re: Zero Breeze Mark 2 air conditioner

would be great just to cool one cabin down, just for sleeping. I wonder if it could it be run off a 12V house bank, to maybe have it run all night?
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Old 10-06-2021, 22:52   #4
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Re: Zero Breeze Mark 2 air conditioner

How good is the cooling? What was the temperature outside and inside the boat when you tried it?
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Old 11-06-2021, 02:26   #5
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Re: Zero Breeze Mark 2 air conditioner

I’m pleased to read that you’re fairly satisfied with this unit.
I expect the de-humidification function is one of it’s chief benefits, as you note.
I wouldn't drink the condensate ['fresh' water], though.

Based upon it's 2300 BTU/H cooling capacity, I would only expect* this unit to fully cool about 153 cubic feet of space, in a tropical setting [200 cu ft in temperate conditions].
But, on a warm/hot day, every little bit helps!

* A “rule of thumb” recommendation for sizing (Tropical) marine air-conditioning is about 14-to- 15 BTU/Hr per cubic foot of cabin volume.

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Old 11-06-2021, 03:34   #6
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Re: Zero Breeze Mark 2 air conditioner

How many watts is this thing rated for? Looks to be the perfect cabin cooler for getting to sleep on sticky nights.

You could even dump the waste heat into a locker or the main cabin used that way.

PS: don’t use air conditioning runoff as drinking water. Aside from heavy metals present from the evaporator, it’ll have highly concentrated air contaminants such as mold spores, pollen, dust, chemicals, etc
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Old 11-06-2021, 11:10   #7
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Re: Zero Breeze Mark 2 air conditioner

We just purchased one the other day, has not arrived yet. Seems like a pretty good option to keep our Vberth cool on sticky nights.
Specs are pretty neat.
Variable speed compressor
120 or 24v
2300 btu
Looks like 160ish watts on boost mode.
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