Generator to run 6000btu window ac - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > On Board > Gear & Maintenance > Electrical Systems
 Not a Member? 


Like Tree2Likes
Reply
 
LinkBack Thread Tools
  #1  
Old 05-03-2013
sailguy40's Avatar
Senior Member
 
Join Date: Feb 2010
Posts: 306
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 5
sailguy40 is on a distinguished road
Generator to run 6000btu window ac

Can anyone recommend a generator that will run an ac like this? I am hoping a 2000 watt will be good enough, here is the ac I have...LG L6011ER: 6,000 BTU Window Air Conditioner with remote | LG USA
Reply With Quote Quick reply to this message Share with Facebook
  #2  
Old 05-05-2013
Zanshin's Avatar
Senior Member
 
Join Date: Aug 2006
Location: Germany
Posts: 2,208
Thanks: 0
Thanked 15 Times in 15 Posts
Rep Power: 9
Zanshin is on a distinguished road
Re: Generator to run 6000btu window ac

The 6000BTU unit states an energy efficiency of 9.7, so 6000/9.7 is 618 Watts. In reality losses and the inefficient thermal insulation of the boat will make the unit less efficient, so take 800W as the constant load. Generators are rated at colder temps and their efficiency goes way down as they get warmer (and since you need AC it will be warm), so take 20% off your 2000W genset giving 1600W then take another 20% off that for the maximum constant running output giving 1300W realistic power when running all day.

The numbers are just examples of the math you need to do, you can plug in your own estimates. Are you planning on charging the batteries or running other items off the generator? Those would need to be added into the equation as well.
__________________

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Quick reply to this message Share with Facebook
  #3  
Old 05-05-2013
FarCry's Avatar
Freedom 39
 
Join Date: Apr 2007
Location: St Thomas USVI
Posts: 975
Thanks: 0
Thanked 23 Times in 21 Posts
Rep Power: 8
FarCry is on a distinguished road
Re: Generator to run 6000btu window ac

Quote:
Originally Posted by Zanshin View Post
The 6000BTU unit states an energy efficiency of 9.7, so 6000/9.7 is 618 Watts. In reality losses and the inefficient thermal insulation of the boat will make the unit less efficient, so take 800W as the constant load. Generators are rated at colder temps and their efficiency goes way down as they get warmer (and since you need AC it will be warm), so take 20% off your 2000W genset giving 1600W then take another 20% off that for the maximum constant running output giving 1300W realistic power when running all day.

The numbers are just examples of the math you need to do, you can plug in your own estimates. Are you planning on charging the batteries or running other items off the generator? Those would need to be added into the equation as well.
You lost me Zanshin. Not seeing the purpose of you calculating the efficiency of the AC output in BTU and then making a statement about watts for operation. Your math just shows how to calculate EER or energy efficiency rating and is already provided by the manufacturer.

The AC specs show an electrical draw of 560 watts which should be RLA or running load amps. Start up loads are usual double or more for a second or two. A 1000 watt generator would probably run it but I would get a 2000 watt one, that way you are not pushing it so hard at start up and have more than 1000 watts free to run other things if you'd like unless you find the compressor cycling on and off. There isn't much cost difference between a 1000 and 2000 watt generator typically.

Last edited by FarCry; 05-05-2013 at 06:19 PM.
Reply With Quote Quick reply to this message Share with Facebook
  #4  
Old 05-05-2013
Zanshin's Avatar
Senior Member
 
Join Date: Aug 2006
Location: Germany
Posts: 2,208
Thanks: 0
Thanked 15 Times in 15 Posts
Rep Power: 9
Zanshin is on a distinguished road
Re: Generator to run 6000btu window ac

I thought that the BTUs divided by the EER would give Watts, which in turn is the energy measurement most often used for generator output.

https://en.wikipedia.org/wiki/Season...ficiency_ratio

Where is my error?
__________________

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Quick reply to this message Share with Facebook
  #5  
Old 05-05-2013
FarCry's Avatar
Freedom 39
 
Join Date: Apr 2007
Location: St Thomas USVI
Posts: 975
Thanks: 0
Thanked 23 Times in 21 Posts
Rep Power: 8
FarCry is on a distinguished road
Re: Generator to run 6000btu window ac

If you follow the link Sailguy provided, it shows the pertinent information in the specs. Yes you can run the numbers forward and backwards but it doesn't change the spec showing the running wattage of 560 and an EER of 10.7 on a 6000 BTU unit. We can get there your way to check LG's numbers. 6000 BTU/10.7 EER = 560 watts just like the specs say and that is the number that we need. What we don't know for sure is the starting load. That is what is needed to size the generator properly.

I do not see where your numbers are coming from in the link. I don't see the EER number you used in the link. Maybe the link has changed. There is no error in your math. Why not just take the easy path and use the numbers that are specified by the manufacturer rather than complicating it?

And yes your point of the loss of efficiency as the ambient temperature around a generator increases is a good one. Typically if the small generator we are discussing can start a motor, it will have no problem running it.

Last edited by FarCry; 05-05-2013 at 06:51 PM.
Reply With Quote Quick reply to this message Share with Facebook
  #6  
Old 05-05-2013
Zanshin's Avatar
Senior Member
 
Join Date: Aug 2006
Location: Germany
Posts: 2,208
Thanks: 0
Thanked 15 Times in 15 Posts
Rep Power: 9
Zanshin is on a distinguished road
Re: Generator to run 6000btu window ac

I didn't follow the link provided, I just googled the model number to get the EER in order to compute the watts, I didn't realize it was there already.

After discussions with Fischer Panda I realized that the fine print in generator advertising/manuals is important and that genset output needs to be seriously de-rated in the tropics.

I don't know if a 6000BTU unit is going to cool a boat even if running 100% of the time.
__________________

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Quick reply to this message Share with Facebook
  #7  
Old 05-05-2013
Senior Member
 
Join Date: Oct 2009
Location: Virginia
Posts: 1,099
Thanks: 3
Thanked 16 Times in 16 Posts
Rep Power: 6
chuck53 is on a distinguished road
Re: Generator to run 6000btu window ac

I see you have a 22 footer. A 6000 BTU unit is plenty big enough. On a hot, sunny day, it will struggle some , but you will be able to hang meat in there at night.

A Honda 2000 is more than enough to run that unit.
bljones likes this.
__________________
Catalina 34
Reply With Quote Quick reply to this message Share with Facebook
  #8  
Old 05-05-2013
Senior Member
 
Join Date: Feb 2013
Location: South of Albuquerque
Posts: 442
Thanks: 2
Thanked 17 Times in 15 Posts
Rep Power: 2
desert rat is on a distinguished road
Re: Generator to run 6000btu window ac

Ac to DC 40% loss DC to AC 40% loss hydrocarbon to electrical 60% loss, find a better way. Ice chest, evaporative cooler. or just suffer.
Reply With Quote Quick reply to this message Share with Facebook
  #9  
Old 05-07-2013
chucklesR's Avatar
Senior Member
 
Join Date: Sep 2007
Location: Pasadena Md - Magothy side
Posts: 5,979
Thanks: 10
Thanked 31 Times in 31 Posts
Rep Power: 10
chucklesR is a jewel in the rough chucklesR is a jewel in the rough chucklesR is a jewel in the rough
Re: Generator to run 6000btu window ac

You could maybe squeak by with the little 900w / 800w continuous unit that Harbor Freight sells for as little as 99 bucks (on sale, 120 normal).

Of course it's loud so you'd get run out of the anchorage.
jameswilson29 likes this.
__________________
Lessons learned are opportunities earned.
Reply With Quote Quick reply to this message Share with Facebook
  #10  
Old 05-07-2013
jameswilson29's Avatar
Senior Smart Aleck
 
Join Date: Aug 2009
Location: Richmond, Virginia
Posts: 2,152
Thanks: 34
Thanked 70 Times in 65 Posts
Rep Power: 6
jameswilson29 is on a distinguished road
Re: Generator to run 6000btu window ac

I just bought that HF Tools unit on sale for $89 to run my power tools and wet/dry vac. Seems adequate for the task - actually runs better under load.
Reply With Quote Quick reply to this message Share with Facebook
Reply

Quick Reply
Message:
Options

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Register Now

In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


Similar Threads
Thread Thread Starter Forum Replies Last Post
cracked window AKAPeterc Gear & Maintenance 3 05-01-2013 02:36 PM
CS 40 Side window colinflteng CS Yachts 8 11-28-2012 07:52 PM
Window replacement wchevron Gear & Maintenance 10 12-03-2008 05:43 PM
Help costing a generator and lots of generator questions... labatt Gear & Maintenance 10 10-16-2008 02:01 AM
window fix marinoinPV Gear & Maintenance 3 02-18-2008 12:48 PM


All times are GMT -4. The time now is 10:21 PM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.