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extern akku for Hifiberry Amp

Tagor12

September 11, 2015 20:19

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Hi thair i am planing to make an portable Speaker and want an raspberry pi an hifyberry dac and an dynavox or an Pi and an Hifiberry amp but the Problem is that i need an external Battery for that and can't find one
doas anny one of you know an possibility?

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3 comments

• 0
  
  HiFiBerry team September 12, 2015 07:14

  Hi,
  
  for this use case I would recommend a 12V lead battery. While LiPo batteries will also work there is a bigger risk that you damage them if you don't turn off the board before they are fully discharged. Therefore, for LiPo batteries you should use an additional circuit that protects the battery from being fully discharged.
  Our reseller AVC/Sertronics in Germany has a nice selection of lead batteries, but you will find these also at other electronics resellers.
  http://www.avc-shop.de/epages/64272905.sf/de_DE/?ObjectPath=/Shops/64272905/Categories/Batterien__Akkus/Blei_Akkus
  
  Best regards
  Daniel
• 0
  
  Haldi A September 28, 2016 23:28

  It's been a while.....
  So how are people batterypowering their AMP+ ?

  i heavily dislike the idea of a lead battery... for a small 2A Battery thats already over 1kg.

  Using 2100mAh NiMH 1.2V cells in a series would only result in about 300g.

  With 4 LiPo 3.7V cells it would be even lighter. 5.2A Packs are on sale for 18 Euros, and 20C should be enough for the Amp+.

   

  Talk about Discharge rate.... two more questions:

  A: Does the Amp+ send the input Voltage to the Pi? Is there any way to know when the battery Voltage will drop too low?

  B: How much power does the Amp+ draw? Maximum 25W.... for one or two speakers? so 50W FullPower Stereo? Meaning the LiPo pack would last 1.5h? And is the Powerdraw linear or is using 50% volume only using 30% Energy?

   

  Anyone has used a Battery for a longer time period and can tell how long it lasts?

   

   

   

   

   

   

  Edited by Haldi A September 28, 2016 23:43
• 0
  
  HiFiBerry team September 29, 2016 04:56

  Hi,

  the Amp+ does not measure the input voltage. I strongly recommend to use a protection circuit between the battery and the Amp+ when you're using LiPo batteries.

  Power consumption of the Amp+ depends on the output volume. In many use cases the average consumption of the Amp+ will be below 0.1A. This has nothing to do with the volume control setting, but how loud the music you're playing really is. 

  Best regards,
  Daniel