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nkostop 1st March 2014 07:01 PM

LifePo BMS and audio quality
Hello, i am thinking of building a battery power supply for my amplifier.
I was checking on LiFePo batteries which need a BMS to operate.
I was concerned if a BMS like this:
12V 14.6V 30A LiFePo4 Battery BMS LFP PCM SMT System 4S eBike battery Pack / DIY | eBay

Which has a lot of switching mosfets will introduce noise to the amplifier?
What is the best way to connect an amp with a lifepo battery?

richie00boy 1st March 2014 08:04 PM

ebay links don't work on here. You need to post the item number.

It may have switching MOSFETs but they are not switching at a frequency.

nkostop 1st March 2014 08:14 PM

Oh sorry, i am new to the forum.
The number is:
eBay item number:321046261305

Hope this helps. And please if you can explain to me why it will not affect the audio quality i would be gratefull. Secondly does this change the impedance?

richie00boy 3rd March 2014 07:23 AM

They are being used as switches. The impedance of the MOSFETs shouldn't be a problem, the current limiter in the batteries would be more of a concern.

peufeu 3rd March 2014 07:26 AM

BMS Mosfets are normally ON. If the controller detects an error condition like overcurrent, overcharge, overdischarge, etc, they will be switched OFF. If your amplifier never draws more than the specified current for your BMS (here 30A) then the MOSFETs will always be ON and you won't have any problems.

nkostop 3rd March 2014 01:51 PM

Ok! i got it! In normal conditions there is no problem.
Is these items from ebay any good? Are there any other option you could suggest?

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