solar panel voltage?

Discussion in 'The Projects Forum' started by Gadersd, Jul 8, 2013.

  1. Gadersd

    Thread Starter Member

    Dec 8, 2012
    98
    1
    I am going to buy a bunch of solar panels to get 5v 1.5 amps for a USB phone charger. I need a precise 5v. Should I stick with the 5v solar panels or use 7v solar panels with a 5v regulator?
     
  2. blueroomelectronics

    AAC Fanatic!

    Jul 22, 2007
    1,758
    98
    You need to regulate it.
     
  3. wayneh

    Expert

    Sep 9, 2010
    12,123
    3,048
    And, you'll get the most power (voltage times current) from your panels when they are run at ~80% of their max voltage, not when they are drawn down by excessive current. So the panels' open-circuit voltage needs to be 5V + regulator drop out + 20% or so. Obviously, a low-dropout regulator helps.

    A concurrent thread here uses a device that might help you.
     
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