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Thread: 12v 24v 48v

  1. #1
    Junior Member
    Join Date
    Apr 2011
    Posts
    4

    Default 12v 24v 48v

    I'm just getting into solar, got a couple folding portable panels for recharging phones, tablets, flashlights, etc. And I'm thinking about a solar system for the house. Starting off small, as a backup and for experimenting, but I foresee eventually getting enough to be able to at least power some of the house should the power go out.

    I'm wondering what (if any) advantage there might be going with 24v or even a 48v system over 12v. It seems to me that it might be more efficient, especially for eventually powering an inverter and running larger appliances.

    I'm a total newb, and although I'm not completely ignorant of electrical workings, I'm not an expert. So keep it reasonably simple!

    Thanks for any thoughts, ideas, warnings, or links to more info!

    Az

  2. #2
    Moderator
    Join Date
    May 2009
    Location
    off grid retirement in Northern Calif
    Posts
    7,423

    Default

    For small ( less than 1,000 watt inverter or load) systems, 12v is ok, but larger systems 24 or 48V is a better way, less wire losses, more operating range [ 12v-11v, 25v-23v, 52-48v ], and less need to parallel batteries.
    Since the dawn of time it has been mankind's dream to blot out the sun.
    Montgomery Burns

    "Always listen to experts. They'll tell you what can't be done and why. Then do it."

    spreadsheet based voltage drop calculator:
    http://www.solar-guppy.com/download/...calculator.zip
    http://www.solarpaneltalk.com/showth...oss-calculator

    http://www.mike-burgess.org/PVinfo_2.html

    solar: http://tinyurl.com/LMR-Solar
    gen: http://tinyurl.com/LMR-Lister ,
    battery lugs http://tinyurl.com/LMR-BigLug
    Setting up batteries http://tinyurl.com/LMR-NiFe

    gear :
    Powerfab top of pole PV mount | Listeroid 6/1 w/st5 gen head | XW6048 inverter/chgr | Iota 48V/15A charger | Morningstar 60A MPPT | 48V, 800A NiFe Battery (in series)| 15, Evergreen 205w "12V" PV array on pole | Midnight ePanel | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor (1/2hp 240V 1ph ) on a timer for 3 hr noontime run - Runs off PV || || VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A

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