Dual batteries, dimming lights

[nstillmatic 10+ year member]

Alright, so I have my system wired up to a Kinetik HC2000 in the trunk with a yellowtop under the hood. When the car is NOT running and the subs are playing at a high level the lights start to dim (which is connected to the front battery).

Is it doing this because the two batteries aren't isolated or is my system just requiring more power than the kinetik can handle?

Again, this doesn't happen when the engine is running, and the lights that are dimming are wired to the front battery.

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[helotaxi 5,000+ posts]

Seriously? The car isn't running. When you place a load on the battery (amps, HEADLIGHTS, etc...) the voltage from the battery drops. If you keep playing it like that, it will continue to drop until your battery is effectively dead. If you're lucky, the amp will go into under-voltage protect mode, if you're unlucky the amp will go up in a puff of smoke. Don't run the system with the car off and especially not with the headlights on as well.

 

[xoutofmyheadx 10+ year member]

omg you mean batteries don't hold unlimited power til the end of time?

 

[Firebird 1991 10+ year member]

lmao

 

[Phoenix Risen 10+ year member]

Alright, so I have my system wired up to a Kinetik HC2000 in the trunk with a yellowtop under the hood. When the car is NOT running and the subs are playing at a high level the lights start to dim (which is connected to the front battery).
Is it doing this because the two batteries aren't isolated or is my system just requiring more power than the kinetik can handle?

Again, this doesn't happen when the engine is running, and the lights that are dimming are wired to the front battery.

it makes me sad that we live in the same state, just putting it out there

and why is it the morons always have really nice equipment that they are hell bent on destroying.

 

[05fronty 5,000+ posts]

this thread made my day

 

[yadogg 10+ year member]

this thread made my day

right there with you ! ha!

 

[nstillmatic 10+ year member]

Lol. I don't run the system with the car off, it was just for a short period of time because I wanted to see if the auxiliary battery itself could power my system. I didn't know it grabbed power from the front battery that much to cause interior light dimming. Before I upgraded my system I never had any problems with dimming whatsoever whether the car was running or not so I figured it should be the same way if the new rear battery I put in was doing it's job. I guess that logic doesn't hold much water.

 

[plugitin 5,000+ posts]

*sigh*

 

[audiolife 5,000+ posts]

Id like to see 1 battery not have a voltage drop with the lights on and a 1500 watt system play...never seen it before as the 20 or so powercells from a few different manufacturers in my garage all have a voltage drop with a 100 amp load placed on them.....

If it is "dimming more" your ground on the secondary battery could have a ground loop causeing it to not get a full charge with the engine running or worse yet your alternator is too small allowing both cells to rest under 12.7-12.8 volts.