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29-02-2020, 10:12
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#1
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Marine Service Provider
Join Date: Aug 2015
Location: Parkland Florida
Boat: Custom Mabru 40 open SF
Posts: 85
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Marine 12v air conditioning
I am planning to replace my AC air conditioning on my boat from 115v AC to 12v DC, the one we have in the Master is noisy run with the inverter and consume 65amps producing 7000BTU, we were able to see a manufacturer at the boat show">Miami boat show presenting a 12v military 7000 with touch screen and heat running on less than 30 amps including the pump, that unit was very quiet, 17 F differential between the air intake and the discharge, 380CFM.. what else should we ask this company, their reviews are excellent.
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29-02-2020, 15:04
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#2
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Registered User
Join Date: Jun 2019
Location: Darwin
Boat: Oram
Posts: 95
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Re: Marine 12v air conditioning
Quote:
Originally Posted by Mabruteam
I am planning to replace my AC air conditioning on my boat from 115v AC to 12v DC, the one we have in the Master is noisy run with the inverter and consume 65amps producing 7000BTU, we were able to see a manufacturer at the Miami boat show presenting a 12v military 7000 with touch screen and heat running on less than 30 amps including the pump, that unit was very quiet, 17 F differential between the air intake and the discharge, 380CFM.. what else should we ask this company, their reviews are excellent.
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Ask them how much it costs (quote) fitted, Domestic household split system style air conditioners are easily the best cheapest option, not only do they (manufacturers) make millions of them every year they spend big mobs on r&d. Can fit yourself (it’s not rocket science) and can be run either through inverter or generator Cheers
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29-02-2020, 18:59
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#3
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Marine Service Provider
Join Date: Aug 2015
Location: Parkland Florida
Boat: Custom Mabru 40 open SF
Posts: 85
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Re: Marine 12v air conditioning
Thank you for the answer but where can I put it? On top of that my wife hates the Generator noise..
Quote:
Originally Posted by Bunji
Ask them how much it costs (quote) fitted, Domestic household split system style air conditioners are easily the best cheapest option, not only do they (manufacturers) make millions of them every year they spend big mobs on r&d. Can fit yourself (it’s not rocket science) and can be run either through inverter or generator Cheers
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29-02-2020, 19:14
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#4
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always in motion is the future
Join Date: Feb 2009
Location: in paradise
Boat: Sundeer 64
Posts: 18,757
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Re: Marine 12v air conditioning
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29-02-2020, 19:20
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#5
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Registered User
Join Date: May 2010
Location: Sydney Australia
Boat: Fisher pilothouse sloop 32'
Posts: 3,413
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Re: Marine 12v air conditioning
Quote:
Originally Posted by Mabruteam
Thank you for the answer but where can I put it? On top of that my wife hates the Generator noise..
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Would that be the same boat that has the multiple fridge's shown in the refrigeration thread?
__________________
Rob aka Uncle Bob Sydney Australia.
Life is 10% the cards you are dealt, 90% how you play em
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29-02-2020, 21:10
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#6
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Registered User
Join Date: Jun 2019
Location: Darwin
Boat: Oram
Posts: 95
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Re: Marine 12v air conditioning
Quote:
Originally Posted by Mabruteam
Thank you for the answer but where can I put it? On top of that my wife hates the Generator noise..
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U mention going from 115 volt to 12 volt dc. Many people run a 2.5 kw split system ac from a 600 - 1000 amp/hr lithium battery bank through an inverter, If u don’t have room for a split go the old box style (Rac) and use one of these, Micro-air easy start 364, would u rather be hot and sweaty or listen to a super quiet honda 22i. Funny that When I tell the Better half she makes more noise than the generator Haha
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01-03-2020, 08:45
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#7
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Registered User
Join Date: Aug 2011
Location: Boston area
Boat: Little Harbor 46 (1988)
Posts: 326
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Re: Marine 12v air conditioning
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01-03-2020, 10:00
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#8
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Registered User
Join Date: Aug 2015
Location: Sozopol
Boat: Riva 48
Posts: 1,372
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Re: Marine 12v air conditioning
My take on boat air conditioning is that 12V does not work. You can design a good 12V compressor, may be even use a large fridge compressor, you need about 400 watts for a minimum size 5,000 BTU capacity, which means around 35A, yes manageable. However, these parts are not mass produced and expensive.
The cheap solution is to install a portable or window air conditioner in a locker!, route the exhaust air outside of the boat and make ducts to take air in and out of the cabin. The benefits here are low cost and low noise.
The proper solution is a a marine rated unit but installation is a pain and I have not seen any quiet units. It is just not possible to design a quiet sea pump that moves 6 gallons of water per minute or whatever the minimum cooling requirement is. You are better off moving air out of a locker instead.
SV Pizzazz
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01-03-2020, 10:12
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#9
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always in motion is the future
Join Date: Feb 2009
Location: in paradise
Boat: Sundeer 64
Posts: 18,757
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Re: Marine 12v air conditioning
Quote:
Originally Posted by Pizzazz
My take on boat air conditioning is that 12V does not work. You can design a good 12V compressor, may be even use a large fridge compressor, you need about 400 watts for a minimum size 5,000 BTU capacity, which means around 35A, yes manageable. However, these parts are not mass produced and expensive.
The cheap solution is to install a portable or window air conditioner in a locker!, route the exhaust air outside of the boat and make ducts to take air in and out of the cabin. The benefits here are low cost and low noise.
The proper solution is a a marine rated unit but installation is a pain and I have not seen any quiet units. It is just not possible to design a quiet sea pump that moves 6 gallons of water per minute or whatever the minimum cooling requirement is. You are better off moving air out of a locker instead.
SV Pizzazz
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I linked to two brands of marine rated units that do all that. Key is to use the new inverter technology units, which isobar makes the new domestic units so silent as well (they are variable speed).
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01-03-2020, 13:55
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#10
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Registered User
Join Date: Aug 2012
Location: PNW
Boat: Bruce Roberts Ketch 40
Posts: 477
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Re: Marine 12v air conditioning
Swamp cooler will be all 12v. 12v pump, 12v fan.
If you can put Gel Packs from your freezer in the reservoir it will blow very cold air.
The longer it runs the cooler your boat will get.
Simple enough you can build your own.
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01-03-2020, 16:22
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#11
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Registered User
Join Date: Aug 2015
Location: Sozopol
Boat: Riva 48
Posts: 1,372
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Re: Marine 12v air conditioning
Quote:
Originally Posted by s/v Jedi
I linked to two brands of marine rated units that do all that. Key is to use the new inverter technology units, which isobar makes the new domestic units so silent as well (they are variable speed).
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Thank you, I missed it. I found another interesting solution, looks good on paper but probably too small. It could make sense for a v-berth or the back cabin on a smaller boat. It is basically a 12V, inverter powered micro DC with 1,800 btu's at 10A which sounds approximately right. Sample cost $550 which means that with a distributor discount the price would be even lower.
https://www.rigidchill.com/micro-dc-aircon/#
I am not sure how much the inverter technology helps these small units as they will be operating at maximum rpm's anyway. Still, I do not think that one can beat the price performance of a small window unit ($150) installed in a locker and properly ducted (meaning four ducts, not one or two).
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02-03-2020, 13:09
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#12
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Registered User
Join Date: Jun 2014
Location: Long Island
Boat: Tartan 37C
Posts: 171
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Re: Marine 12v air conditioning
This Micro DC Aircon looks very interesting. Have you conducted any additional research?
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02-03-2020, 15:55
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#13
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Registered User
Join Date: Jun 2019
Location: Darwin
Boat: Oram
Posts: 95
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Re: Marine 12v air conditioning
Quote:
Originally Posted by Pizzazz
Thank you, I missed it. I found another interesting solution, looks good on paper but probably too small. It could make sense for a v-berth or the back cabin on a smaller boat. It is basically a 12V, inverter powered micro DC with 1,800 btu's at 10A which sounds approximately right. Sample cost $550 which means that with a distributor discount the price would be even lower.
https://www.rigidchill.com/micro-dc-aircon/#
I am not sure how much the inverter technology helps these small units as they will be operating at maximum rpm's anyway. Still, I do not think that one can beat the price performance of a small window unit ($150) installed in a locker and properly ducted (meaning four ducts, not one or two).
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1,800 btu’s = 0.5 kws ? Probably to small, absolutely
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25-04-2020, 03:28
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#14
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Registered User
Join Date: Apr 2020
Posts: 50
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Re: Marine 12v air conditioning
Do you guys realize that the OP is asking about the new Mabru DC air conditioner and that he IS the manufacture . Look at his name ,Team Mabru . Basically this is just an advertisement .
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25-04-2020, 03:58
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#15
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Senior Cruiser
Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 49,082
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Re: Marine 12v air conditioning
Greetings and welcome aboard the CF, Whatta Life.
Thanks, for the heads up.
Quote:
Originally Posted by Whatta Life
Do you guys realize that the OP is asking about the new Mabru DC air conditioner and that he IS the manufacture . Look at his name ,Team Mabru . Basically this is just an advertisement .
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__________________
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"
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