Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations MintJulep on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Hamster is powering my 6kwatt system

Status
Not open for further replies.
inquisitiveness

inquisitiveness

Automotive
Joined
Jun 11, 2019
Messages
5
Location
US
Two equal 12v batterys front and bed of truck (slightly different age of year ish) powered by a 180amp alternator. With 550amp relay switch. How long will this take to fully charge both under normal (ish) driving conditions. I'll add the 2nd "bed" batt Is directly powering a 6kwatt (max) set of subs. Yes yes I know I need to add more amp at the alternator side and I promise I will..... before I add the other 3k watts... promise. Haha.
 
Sort by date Sort by votes
12v motorcycle batteries, or 12v forklift batteries, or somewhere in the middle? Need the capacity (generally stated in amp-hours) of both of them, not just the voltage ...

On the alternator side, 180 amps at nominal 12 volts is about 2.2 kW, so your load may be capable of running the batteries down even with the charging system operating.
 
Upvote 0 Downvote
Two red top optimum car batterys. They are in a 2014 ram 5.7 hemi. I think about 1000ah each.
 
Upvote 0 Downvote
That's not plausible. That's probably the cranking-amp rating. You are looking for the amp-hours rating.

Which one?
It's either 44 A.h or 50 A.h ...

If you are using two of them and it's the bigger one, that's 100 A.h of capacity, and nominally the time to recharge with a 180 amp supply (and zero load!) is (100 / 180) = 0.55... of an hour ... That's plausible.
 
Upvote 0 Downvote
You are never going to have all 180 amps available to charge the batteries. Just running the engine and accessories will take quite a bit of that output what with lights, fans, electric power steering, fuel injection, etc. Hopefully the batteries are never fully discharged either or they won't be long for this world. Whether or not the alternator can keep the batteries charged up depends entirely on how much load the amps are actually pulling. Music is an incredibly dynamic load and just changing the volume 3 dB will change the power consumption 2:1.

----------------------------------------

The Help for this program was created in Windows Help format, which depends on a feature that isn't included in this version of Windows.
 
Upvote 0 Downvote
↑↑↑ peak load is probably why ultra-capacitors exist.


Norm
 
Upvote 0 Downvote
Correction, yes they are 50ah each.


I have always been told that in car audio batterys Vs capacitors you should always do batterys... capacitors are fine for lower watt systems but once you get over a certain RMS multiple batterys and larger alternator(s) are the best..
 
Upvote 0 Downvote
will play a few songs while driving around town or interstate. So few songs with bass turned up then maybe a few minutes with no bass volume low and/or off. So maybe 50% roughly of my commute is full blast.
 
Upvote 0 Downvote
Invest in hearing aid stocks.

----------------------------------------

The Help for this program was created in Windows Help format, which depends on a feature that isn't included in this version of Windows.
 
Upvote 0 Downvote
So is it safe to say roughly 15min on 30min off during a normal drive? Along with twice a week take sign language classes lol (dgallup)
 
Upvote 0 Downvote
Status
Not open for further replies.

Similar threads

A
  • Question Question
Hydraulic Actuated Rear Wing system
2
Replies
22
Views
8K
gruntguru
gruntguru
rQuestionEngineering
  • Locked
  • Question Question
The trickiest part of HVAC is just addressing the leaks at hidden locations.
Replies
1
Views
972
MadisonCameron
MadisonCameron
MRSSPOCK
  • Locked
  • Question Question
starter lock out relay mercedes a140 W-168 - what is its purpose - bypass possible
Replies
5
Views
782
MRSSPOCK
MRSSPOCK
neongreen
  • Locked
  • Question Question
Test Equipment Issues
Replies
11
Views
809
neongreen
neongreen
fatfenders
  • Locked
  • Question Question
Rostra cruise control mystery
Replies
6
Views
545
fatfenders
fatfenders

Part and Inventory Search

Sponsor

Back
Top