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Old 08-27-2012   #1 (permalink)
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Default Voltage Drop info

Please Note:

This is information that I fell upon and it is not my work... I want to give credit to Hsoffroad over at 8th civic for posting this information.

DIY - Understanding Voltage Drop (Headlight Dimming) - 8th Generation Honda Civic Forum

Here is an online calculator to determining voltage drop along a wire...

Voltage Drop Calculator - for single and 3 phase ac systems and dc systems


Just thought some guys would like to use the calculator to determine an estimation of the voltage drop. Not sure how accurate this is but will give you a good idea
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Last edited by Beckerson1; 08-27-2012 at 03:09 PM.
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Old 08-27-2012   #2 (permalink)
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Default Re: Voltage Drop info

I should only have 1.8% drop. I'll have to test that next week when my amp gets installed
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Old 08-28-2012   #3 (permalink)
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Default Re: Voltage Drop info

Quote:
Originally Posted by Beckerson1 View Post
Please Note:

This is information that I fell upon and it is not my work... I want to give credit to Hsoffroad over at 8th civic for posting this information.

DIY - Understanding Voltage Drop (Headlight Dimming) - 8th Generation Honda Civic Forum

Here is an online calculator to determining voltage drop along a wire...

Voltage Drop Calculator - for single and 3 phase ac systems and dc systems


Just thought some guys would like to use the calculator to determine an estimation of the voltage drop. Not sure how accurate this is but will give you a good idea
That calculator seems reasonable. Keep in mind there will be a drop at each connector as well. And fuses etc. But it's definitely a good estimation.



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Old 08-28-2012   #4 (permalink)
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Default Re: Voltage Drop info

Thing to keep in mind if you regulator shut off and engage time. I'll get spikes up to 15.2 with fast bass hits with drops two 13s until it engages.
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Old 08-28-2012   #5 (permalink)
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Default Re: Voltage Drop info

Quote:
Originally Posted by 49konvict View Post
I should only have 1.8% drop. I'll have to test that next week when my amp gets installed
As the guys bellow have said. There are many other things that can cause drop but this only estimates the Wire run itself...

Quote:
Originally Posted by Fallen View Post
That calculator seems reasonable. Keep in mind there will be a drop at each connector as well. And fuses etc. But it's definitely a good estimation.
Depending on your Power requirements that drop can be very negligible... High power, ya you will see some... Low power not so much

Quote:
Originally Posted by armykyle1 View Post
Thing to keep in mind if you regulator shut off and engage time. I'll get spikes up to 15.2 with fast bass hits with drops two 13s until it engages.
Yep so its a good idea to test over a extended period of time to help get an accurate estimation...


I haven't personally clamped to see what I get full tilt but figure something like 65A or so...

One run of #2 gauge welding wire... 14 ft run

2.5% drop...

But when truly testing with a DMM (test battery voltage and voltage at amp)

Same at 14.0V Full tilt... And I mean it sits there, absolutely no movement... Running about 800W RMS total... So pretty good
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Old 08-28-2012   #6 (permalink)
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Default Re: Voltage Drop info

Quote:
Originally Posted by Beckerson1 View Post
Depending on your Power requirements that drop can be very negligible... High power, ya you will see some... Low power not so much
Or if the connections are crappy. IE when people forget to scrape down to the bare metal when grounding to the chassis. Or if the set screws in fuse holders/distros aren't tight. The extreme case is when the I^2R losses here cause so much localized heating it melts them



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Old 08-28-2012   #7 (permalink)
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Default Re: Voltage Drop info

Quote:
Originally Posted by Fallen View Post
Or if the connections are crappy. IE when people forget to scrape down to the bare metal when grounding to the chassis. Or if the set screws in fuse holders/distros aren't tight. The extreme case is when the I^2R losses here cause so much localized heating it melts them
lol... As I said many factors go into loss... Most are simple fixes
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Old 08-28-2012   #8 (permalink)
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Default Re: Voltage Drop info

Might as well make a list of Causes and fixes....

Basically a summery of whats been stated and then some:

Causes

1) Improper sized Power/Ground wire
2) Poor connections
- Poor/loose solder points, crimp connections
- Loose connections at Fuses, distro blocks, Amps, etc...
- Paint not removed at grounding points (Includes big 3)
- Improper grounding points

Such grounding points include:

- Failure to ground to frame . Such as sheet metal
- Make sure you use a decent size for you bolt. Also don't assume a pre-existing bolt is a good place to ground...

Fixes

1) Follow provided link to figure appropriate wire gauge for your power requirements...

http://forum.realmofexcursion.com/ac...ire-gauge.html

Please note that these are minimum recommendations. Also its best to plan for the future. You may decide to run more power...

2) Check every solder/crimp for solid connections. Make sure all bolts on fuse holders, amps, distro blocks, etc are tight. Make sure to clear all paint/primer from grounding points. Make sure you use solid grounding points... If you can use bolts, do so...

Also if you have the wire it would be better to run a dedicated ground back to the battery instead of relying on the frame...


Failure to use the correct installation procedures can result in damage to products, fire, and even death... Always remove battery negative before working with any electrical and wrap all bare electrical wire in electrical tape to prevent unwanted discharge from the amps caps... This can cause damage to the amp (some not so much as others).


That's what I could think up so far... Feel free to post some more issues/fixes
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Old 08-29-2012   #9 (permalink)
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Default Re: Voltage Drop info

That's a good list.

I'd elaborate a bit on improper grounding points. Like grounding to sheet metal instead of the frame.

I made that mistake before. Oh look an easy bolt to remove, I'll just ground here. I knew to sand it down. But anyways the bolt ended up turning blue it got so hot once. I'm lucky I didn't light the car on fire.



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Old 08-29-2012   #10 (permalink)
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Default Re: Voltage Drop info

Updated list... Added warnings in bold
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