Is a little Generator worth it? - Page 2 - 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
 Not a Member? 
  #11  
Old 02-09-2010
Bene505's Avatar
Glad I found Sailnet
 
Join Date: Jul 2008
Posts: 3,543
Thanks: 5
Thanked 37 Times in 36 Posts
Rep Power: 7
Bene505 will become famous soon enough Bene505 will become famous soon enough
Quote:
Originally Posted by jaschrumpf View Post
I'm a bit confused with the power conversion. A Honda 1000W generator puts out 1000W at 120V AC. 1W = 1A X 1V, so in this case:

1000W = ~8A X 120V

If you replace that 120V with 12V and keep the wattage the same, don't you get:

1000W = ~80A X 12V

The power output is the wattage, and it should remain constant, shouldn't it? If you lower the voltage, doesn't the amperage increase? Or is this one of those AC/DC things?
I believe the generators, although 1000 watts on their 120v outlets, also have a 12v outlet on them that puts out a very small wattage. That's why people connect their boat's 120v battery charger (the one used at the dock) to the 120v outlet on the generator.

You math looks good, it's just the outlets on the generator itself.

Regards,
Brad
__________________
Posts you might like:

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.
. .
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.
. .
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 Share with Facebook
  #12  
Old 02-09-2010
Livia's Avatar
Vagabond in Training
 
Join Date: Jul 2006
Posts: 217
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 9
Livia is on a distinguished road
We have the Honda 2000. We connect our normal shore power cord to the 30Amp outlet on the generator and then to the shore power fitting on the boat.

In theory we could get ~140Amps DC from the Honda (2000W it the short burst rating not the continuous load rating - I can't remember exactly what the continuous rating was) if our charger and batteries could take that.

In reality, the generator provides more than the amount of juice that our charger asks for and we can also plug other things into the 120V outlet to charge/run while our batteries are charging.
__________________
A l'eau, c'est l'heure
s/v Estrellita 5.10b, Wauquiez Pretorien 35

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

Last edited by Livia; 02-09-2010 at 05:13 PM.
Reply With Quote Share with Facebook
  #13  
Old 02-10-2010
paulk's Avatar
Senior Member
 
Join Date: Jun 2000
Location: CT/ Long Island Sound
Posts: 2,533
Thanks: 4
Thanked 20 Times in 19 Posts
Rep Power: 15
paulk is on a distinguished road
The main question, as others have suggested is what do you need the power for? Are you running hair dryers? Waffle irons? Deck lights on all night? Keeping three 90 amp batteries topped up for general weekend use would be simple with a small solar panel. Check out Sailingdog's link. Generators disturb otherwise quiet anchorages - much like PWC's. If you don't need megawatts, don't.
Reply With Quote Share with Facebook
  #14  
Old 02-10-2010
Livia's Avatar
Vagabond in Training
 
Join Date: Jul 2006
Posts: 217
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 9
Livia is on a distinguished road
Our generator is quieter than our diesel engine

(I agree, cutting down your use is the first step)
__________________
A l'eau, c'est l'heure
s/v Estrellita 5.10b, Wauquiez Pretorien 35

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.
//
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook
  #15  
Old 02-10-2010
mitiempo's Avatar
Senior Member
 
Join Date: Sep 2008
Location: Victoria B.C. Canada
Posts: 7,008
Thanks: 0
Thanked 63 Times in 54 Posts
Rep Power: 7
mitiempo will become famous soon enough mitiempo will become famous soon enough
To my mind the goal is not to run any engine unless you're using it to travel somewhere. Years ago there was a lot less choice but with today's technology the solar and or wind systems can be configured to supply most or all of your power. Even years ago most tried to keep engine running to 1 hour a day, but today many think more and more toys are needed to cross the bay and of course more again for an ocean crossing. It's all about deciding what you really need and planning a viable system to provide the power - silently.
__________________
Brian
Living aboard in Victoria Harbour
Reply With Quote Share with Facebook
  #16  
Old 02-10-2010
Senior Member
 
Join Date: Jul 2001
Posts: 1,174
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 14
k1vsk will become famous soon enough
About the only thing one usually learns on threads like this about generator use, noise, needs, etc is who are the people that think their perspective is the only correct one.
Reply With Quote Share with Facebook
  #17  
Old 02-10-2010
mitiempo's Avatar
Senior Member
 
Join Date: Sep 2008
Location: Victoria B.C. Canada
Posts: 7,008
Thanks: 0
Thanked 63 Times in 54 Posts
Rep Power: 7
mitiempo will become famous soon enough mitiempo will become famous soon enough
Not the only perspective but the original poster should know his alternatives before having to deal with a portable gas engine running on a rolling boat. He bought a sailboat and not a trawler so it can be assumed he likes the peace and quiet of sailing. He should know there are alternatives to a generator.
__________________
Brian
Living aboard in Victoria Harbour

Last edited by mitiempo; 02-10-2010 at 01:24 PM. Reason: add
Reply With Quote Share with Facebook
  #18  
Old 02-10-2010
Senior Member
 
Join Date: Mar 2008
Posts: 536
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 7
Architeuthis is on a distinguished road
And alternatives to an engine! When it comes to sailing the only correct perspective on that is no engine, no electrical needs, and no noise......or so I've been told.

But I agree wtih mitempo. All he has to do is look past the "I'm right" which is in these posts by their nature to see that engines are good, can be used to charge batteries, generators are nice and quieter than engines and cheaper than wind and solar.

If I had the money I would go with a fuel cell. I think the The EFOY 900 fuel cell would be all I would need for my electrical needs.

But the EU2000i is much cheaper and much less noisy than the engine so it wins hands down as the other charging method.
__________________
Have faith that the oceans are going to rise and flood the world, that plague and pestilence brought on by Climate Change is going to punish us for not believing. Please do as they say it is our only hope. :P
Reply With Quote Share with Facebook
Reply


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



All times are GMT -4. The time now is 01:03 AM.

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