portable 12v system
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Forum Name: Miscellaneous - Off Topic
Forum Discription: Topics that just don't fit anywhere else.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=128481
Printed Date: April 25, 2024 at 10:30 PM
Topic: portable 12v system
Posted By: still_walkin
Subject: portable 12v system
Date Posted: September 10, 2011 at 6:07 AM
ok this is my newest project and i need some help. we had a black out earlier this week and i was prepared i had electricity with invertors and a old car battery but when the battery got low i had to charge it with my cars charging system so this is what i want to build.
a portable H/O alt system that consist of a alternator a battery a starting motor, digital voltometer and two invertors. so heres my thoughts i will have a battery 12v that will start the motor thus giving the alternator to turn and generate power after this comes into play i would like the alt to take over and the motor to stop thus the alt to charge the battery and and provide power to the invertors can this be done. ------------- 1993 sdv
Alpine 4x6 6x9 5 1/4 swr-10d4
alpine v60
12.5 VGA flip down
Nettop pc w/10" touch screen
78nova
5-re audio 5x7 ,10" sub &
Xtx-500.5
"Take the faceplate off get the jumperpack"
Replies:
Posted By: KPierson
Date Posted: September 10, 2011 at 7:06 AM
It CAN be done, although you'll still need to find a way to charge your batteries. The motor will take more power to turn then the alternator will provide - it's simple physics - there is no such thing as a "free energy" machine.
You would be better off using a gasoline motor and keeping a few gallons on hand!
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Kevin Pierson
Posted By: still_walkin
Date Posted: September 10, 2011 at 7:23 AM
true that was one of the things i had in condsideration. thats why one of my thoughts was a hi output alt. or could i put the motor on a relay to shut off when the alt kicks in. what is your suggestion
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1993 sdv
Alpine 4x6 6x9 5 1/4 swr-10d4
alpine v60
12.5 VGA flip down
Nettop pc w/10" touch screen
78nova
5-re audio 5x7 ,10" sub &
Xtx-500.5
"Take the faceplate off get the jumperpack"
Posted By: KPierson
Date Posted: September 10, 2011 at 7:26 AM
You would be better off using a gasoline motor and keeping a few gallons on hand!
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Kevin Pierson
Posted By: still_walkin
Date Posted: September 10, 2011 at 7:30 AM
yea i know but i like to challenge myself
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1993 sdv
Alpine 4x6 6x9 5 1/4 swr-10d4
alpine v60
12.5 VGA flip down
Nettop pc w/10" touch screen
78nova
5-re audio 5x7 ,10" sub &
Xtx-500.5
"Take the faceplate off get the jumperpack"
Posted By: KPierson
Date Posted: September 10, 2011 at 7:40 AM
If your challenge is to change the laws of physics you are on the right path.
Start with basic research, find an HO alternator and find out how much HP (yes, HP) it takes to produce full output. HP can be expressed as wattage, 1HP = 746 watts. You can then calculate how big your motor needs to be to spin the alternator. Once you know that, you can calculate how much power the motor will need and then you can compare that to the output of the alternator.
Assume you're alternator needs 10HP to turn and outputs 300A at full load. It would need 8234W to turn. Assuming a base voltage of 14.4V that is 571A of power needed (assuming a non existent 100% efficient electric motor).
You are in for one heck of a challenge!
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Kevin Pierson
Posted By: oldspark
Date Posted: September 13, 2011 at 3:46 AM
LOL!
I thought motor meant engine...
If it doesn't (involve a petrol etc engine), then still_walkin, trust us - there is absolutely NO CHALLENGE involved.
Posted By: howie ll
Date Posted: October 17, 2011 at 5:23 PM
Can I sell you a package deal? London Bridge and the Eiffel Tower?
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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.
Posted By: howie ll
Date Posted: October 17, 2011 at 5:24 PM
And you wouldn't have those 6 x 9s in the same area as the 12s would you?
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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.
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