Marine Air Conditioner (Help Please)12v DC

[B28_Majic]

Something just doesn't seem right about these numbers. I can't quite put my finger on it, but the Mabru numbers seem overly optimistic. I have 12k Btu 23-SEER mini-split that runs about 500-600 watts, which would be in the 50A range at 12V. The Mabru unit plus a water pump is consuming less electricity than my 23-SEER home-based A/C. For energy monitoring, I have a SMAPPEE system that monitors both solar and usage.

Just doesn't make sense to me.

Peter

I agree that this product seems "too good to be true". I will be able to get some information in the next few weeks once I finally pull the trigger on the unit.
Regarding the comparison to your mini split, do keep in mind that the numbers are when utilizing the pump that comes with the system that is also very efficient (amp draw is less than 2A @ 12v) and your mini split utilizes a large condenser fan outside that I imagine would draw at least 2-3A @ 115v if not more.

 

[mvweebles]

I agree that this product seems "too good to be true". I will be able to get some information in the next few weeks once I finally pull the trigger on the unit.
Regarding the comparison to your mini split, do keep in mind that the numbers are when utilizing the pump that comes with the system that is also very efficient (amp draw is less than 2A @ 12v) and your mini split utilizes a large condenser fan outside that I imagine would draw at least 2-3A @ 115v if not more.

Pump draws more than 2A - probably closer to 4 or 5 for system that size.

My energy monitor measures the entire system, not just the head and the compressor. It is inverter technology similar to what the Mabru and other 12vdc units use.

Going 12vdc in and of itself is not more efficient. It's just different power (assuming proper sizing). How do you suppose the Mabru is twice as efficient as a traditional marine hear pump system?

 

[B28_Majic]

Pump draws more than 2A - probably closer to 4 or 5 for system that size.

My energy monitor measures the entire system, not just the head and the compressor. It is inverter technology similar to what the Mabru and other 12vdc units use.

Going 12vdc in and of itself is not more efficient. It's just different power (assuming proper sizing). How do you suppose the Mabru is twice as efficient as a traditional marine hear pump system?

Going 12v is not more efficient in and of itself but 12v to 12v is certainly more efficient than 12v to 115v. A traditional marine heat pump is greatly unchanged since the late 90's, early 2000's. Blowers have changed, there have been some slight compressor changes, and the footprint is smaller but besides that, nothing really noteworthy.

I believe that the type of compressor being used (inverter type vs capacitor based), as well as a much more efficient blower (Permanently Magnet vs Split Capacitor) are all contributing factors. Traditional marine self contained units are not not utilizing inverter type compressors so comparing the Mabru 12kDC to a traditional unit is like comparing your mini split to a window unit. Your mini split will be much more efficient

I've followed their videos and remember seeing somewhere that the pump was drawing just over 1A @ 12v but it was just circulating water in a bucket with 0' head and no hose to push though so I assume that real world consumption would be more.

 

[mvweebles]

Well, good luck. Sounds like you've bought into whatever Mabru is selling. It makes no sense to me. I've followed energy efficiency issues and solar and off grid for over 35 years, and AC cooling efficiency for over 10 years, and have built/installed three solar systems, one of which was off grid.

All I can tell you is the numbers don't make sense to me. But I've been wrong before so I'm eager to learn if Mabru, a tiny spec on the sphere of AC manufacturers, has cracked the code and created efficiency in excess of the top manufacturers in the world who have been working on this same efficiency problem for 30 years. Right now, it sounds like similar claims as Algae-X magnetic diesel conditioners.

Best success. Stay cool!

Peter

 

[FF]

Change is costly. To make AC to change it to DC to charge a batt , to change it back to AC to run an air cond is hardly efficient.

Perhaps a small quiet Honda with a V belt to spin an auto air cond. would be simpler?