Currently, I'm using an old ttgi 400w to power a sony headunit. Nothing loading the 5v rail, just pure 12v. Been running for the past year with no problems. But I've sold / used up all my spare psu's in client builds, and have enough parts to whip up another system to offload, sans psu. I've got an enhance 500w in my main rig, and was wondering how much strain it would be to power the headunit with the main psu? It's 17w rms x 4, and 52w x 4 = 208w peak. I don't have exact power draws of components, but the killawatt shows I'm at ~120-150w idle, and 150-220w load.
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psu powering headunit
- Thread starter ziddey
- Start date
Keep in mind with many PSU designs you might need a load on the 5V rail for it to power up and regulate properly. You might need a couple power resistors.
I wouldn't concern yourself with load. If you read the specsheet for your deck you'll probably find that its rated max load is something like 10A. Not a serious concern.
I don't know why people make such a big deal out of transient peak loads either, just like devices can draw more than their nominal load for short periods, so too can power supplies supply more than their rated load for short periods as well. And heck, if they didn't have overcurrent protection, for long periods until they send themselves into thermal failure.
I wouldn't concern yourself with load. If you read the specsheet for your deck you'll probably find that its rated max load is something like 10A. Not a serious concern.
I don't know why people make such a big deal out of transient peak loads either, just like devices can draw more than their nominal load for short periods, so too can power supplies supply more than their rated load for short periods as well. And heck, if they didn't have overcurrent protection, for long periods until they send themselves into thermal failure.
Yeah, I've been powering it on a separate PSU for a year now. Didn't load 5V, but didn't have any problems either.
And good call about the fuse. I've got a 10A fuse on the back of my unit. Sounds like I definitely have the spare power on my main unit. Just afraid of any noise or violent fluctuations causing issue. For now, I think I'll keep it the way it is. Got a 230w atx sparkle psu I found a few weeks ago. If anything, I'll swap that to headunit duty and see how it holds up.
And good call about the fuse. I've got a 10A fuse on the back of my unit. Sounds like I definitely have the spare power on my main unit. Just afraid of any noise or violent fluctuations causing issue. For now, I think I'll keep it the way it is. Got a 230w atx sparkle psu I found a few weeks ago. If anything, I'll swap that to headunit duty and see how it holds up.
A car is one of the worst electrical environments a device can find itself in. The quality of the power available is awful, and thus your HU will be engineered to operate properly with really nasty power. Wouldn't worry about this either.