Reply
 
Thread Tools Display Modes
 
Old 02-08-2009, 10:39 PM   #11
Bus Crazy
 
Join Date: Jan 2008
Location: Upstate NY (Mohawk Valley)
Posts: 1,096
Re: Power inverters and their uses

We actually did this, sorta-kinda, in a State motor home with Flintstone-era teleconference equipment. It had 2 Sony TV's - a VCR - one or two DirecTV modems - an industrial cube Windows 3.1 PC with tele-conference PC board - and a 'web cam' type camera.

All this was mounted in a corner cabinet. There was a small UPS added inside to prevent power hiccups from losing sync on video signals. With all the power and signal cords, and the cramped space, one of the other techs had managed to plug the UPS into itself. It worked fine for quite a while, as the battery slowly discharged. The UPS finally sounded an alarm, which seemed to be for "no apparent reason." Tearing into the wiring, I found the OOPS on the UPS.

Seriously, If you hooked up your closed loop to fully charged batteries, with nothing else connected, it would sooner or later drain off the entire charge. The efficiency loss of the inverter, the heat generated in the motor, alternator, and wires, and the friction of the V-belt would each take a little bit of the energy stored in the batteries, without putting it back. Any outside load would draw additional power out of the batteries, with no replacement.
__________________
Someone said "Making good decisions comes from experience, experience comes from bad decisions." I say there are three kinds of people: those who learn from their mistakes, those who learn from the mistakes of others, and those who never learn.
Redbear is offline   Reply With Quote
Old 02-09-2009, 08:41 AM   #12
Almost There
 
Join Date: Jan 2009
Location: Moneta Va going to Central Fla in May
Posts: 74
Coachwork: na
Chassis: na
Engine: na
Send a message via Yahoo to drchefscott
Re: Power inverters and their uses

Being I'm far from an Edison or a Franklin when it comes to electricity, I think of something and draw it out. I figured most of you Skoolie Veterans have either tried it yourselves or seen others make these same mistakes. I will figure out something that will work for me eventually. I don't need to reinvent the wheel just need to keep as much cabbage in my pocket as I can so I would rather talk about it here and look a lil foolish than talk about it here already having been a financial fool.

Thanks everybody.

Scott
drchefscott is offline   Reply With Quote
Old 02-09-2009, 12:17 PM   #13
Skoolie
 
Ray_WA's Avatar
 
Join Date: Nov 2008
Posts: 193
Year: 1991
Coachwork: BlueBird
Chassis: GMC
Engine: 6.2 liter diesel
Rated Cap: 24
Re: Power inverters and their uses

Absolutely the right attitude to have!

-Ray
__________________
Pack up your bus and bug out to the hills!
Ray_WA is offline   Reply With Quote
Old 04-12-2009, 08:38 PM   #14
Skoolie
 
newbusser's Avatar
 
Join Date: Mar 2009
Location: Grays Harbor County, Washington
Posts: 173
Year: 90
Coachwork: blue bird
Chassis: International
Engine: Navistar Straight 6 Turbo
Rated Cap: 65
Re: Power inverters and their uses

I absolutely LOVE your idea! Even though it won't work, it is the thought process that you went through that impressed the daylights out of me
I learned a lot from the various responses and am gratefull to you for your original posting, keep them comming...btw, you don't look foolish when you post an idea, just when you keep them to yourself.
__________________
“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
newbusser is offline   Reply With Quote
Old 04-12-2009, 11:37 PM   #15
Bus Geek
 
the_experience03's Avatar
 
Join Date: Feb 2006
Location: Saint James, MN
Posts: 2,669
Send a message via MSN to the_experience03 Send a message via Yahoo to the_experience03
Re: Power inverters and their uses

A person COULD use the electric motor hooked to shorepower to spin up an alternator to chrage the batteries. You would never have to worry about overcharging the batteries which is great. Unfortunately you would never fully charge them either...and it would probably take about a 3-4 horsepower motor to spin the alternator that fast by the time you calculate all the loses.
__________________
http://farm4.static.flickr.com/3024/...09f20d39_m.jpg
Skooling it...one state at a time...
the_experience03 is offline   Reply With Quote
Old 04-13-2009, 02:15 AM   #16
Bus Geek
 
lapeer20m's Avatar
 
Join Date: Nov 2003
Location: near flint michigan
Posts: 2,653
Re: Power inverters and their uses

Quote:
Originally Posted by the_experience03
A person COULD use the electric motor hooked to shorepower to spin up an alternator to chrage the batteries. You would never have to worry about overcharging the batteries which is great. Unfortunately you would never fully charge them either...and it would probably take about a 3-4 horsepower motor to spin the alternator that fast by the time you calculate all the loses.
would never fully charge batteries with an alternator? i don't understand
__________________
Quis custodiet ipsos custodes (who will watch the watchmen?)
lapeer20m is offline   Reply With Quote
Old 04-13-2009, 08:38 PM   #17
Bus Geek
 
the_experience03's Avatar
 
Join Date: Feb 2006
Location: Saint James, MN
Posts: 2,669
Send a message via MSN to the_experience03 Send a message via Yahoo to the_experience03
Re: Power inverters and their uses

Alternators base current output on sensed voltage. As the voltage of a battery approaches it's fully charged state an alternator will trickle it's current down to nearly nothing. For starting cars and such it's not a problem at all. The batteries are easily charged to a 90-95% state of charge all the time. However, with a deep cycle application things can get a little dicey doing that. The electrolyte might become stratified. Sulfation of that last 5% or so will occur. The problem with that is that then that last 5% basically gets taken out of the picture...so now we're charging 95% of our original battery capacity to a 95% state of charge. And so the cycle continues...

I really like alternators as a form of battery charging. I just wouldn't count on one as my primary means of charging unless I knew the small, but certainly existent limitations.
__________________
http://farm4.static.flickr.com/3024/...09f20d39_m.jpg
Skooling it...one state at a time...
the_experience03 is offline   Reply With Quote
Old 04-16-2009, 09:46 AM   #18
Mini-Skoolie
 
Join Date: Apr 2009
Posts: 48
Re: Power inverters and their uses

Does anyone have any experience with this model:

http://cgi.ebay.com/NEW-VECTOR-3000-600 ... 1|294%3A50

I am thinking about ordering one.
__________________
Nicholas Virgil
1987 International (66 passenger) 7.3l diesel
2002 Ford Explorer
1993 Saturn SL2
1988 Chevy C1500
Kmart Mountain Bike
nickverge is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Power inverters and electrical questions MissJaneStrummor Conversion Tutorials and How-to's 1 04-16-2014 02:34 PM
Harbor freight power inverters lapeer20m Conversion General Discussions 0 09-20-2007 11:15 PM
Cheap Power Inverters the_experience03 Conversion General Discussions 11 03-10-2006 08:18 PM
cheap power inverters batchlor BusMan Everything Else | General Skoolie Discussions 2 04-06-2004 06:02 PM
Power Inverters - which makes more sense? bus.driver Everything Else | General Skoolie Discussions 2 02-24-2004 12:01 PM

» Virginia Campgrounds

Reviews provided by

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 01:26 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2017, vBulletin Solutions, Inc.