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Thread: new solar user

  1. #1
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    Default new solar user

    I am pulling up roots and heading west and have some questions about how to power my c-pap machine all/every night and recharge all day. How do I determine wattage needed and what type of equipment do I need. It can operate in DC mode if that will help. thanks

  2. #2
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    Default

    hi and welcome
    Someone here has that exact same problem and will be along to help.
    Rich
    WWW.solarsaves.net

    NABCEP certified Technical Sales Professional

    http://www.solarpaneltalk.com/showth...Battery-Design

    http://www.calculator.net/voltage-drop-calculator.html (Voltage drop Calculator among others)

    www.gaisma.com

  3. #3
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    Default

    here's a thread about CPAP
    http://www.solarpaneltalk.com/showth...highlight=cpap

    What I do for 1 overnight, is I have a automotive battery jumper pack, that has a 12V outlet, and 2x the watt hour capacity I need for 1 night.

    I have a couple posts in that thread that cover what I did

    Mike
    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

  4. #4
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    Default overnight

    I am also considering running a fan with the c-pap machine. How do I calculate the wattage of solar panels. If that is an equipment list I'd appreciate it written in a more understandable format as I rode the little bus.

    thank you, Paul

  5. #5
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    Quote Originally Posted by pzed View Post
    I am also considering running a fan with the c-pap machine. How do I calculate the wattage of solar panels. If that is an equipment list I'd appreciate it written in a more understandable format as I rode the little bus. thank you, Paul
    1) get a Kill-a-watt meter, plug in your fan and cpap, and let it record data for a week. That will give you a good 7 day recording of the power used/needed. Record from Noon <day1> till Noon <day 7>.
    Write down the Watt Hours Divide by 7 = WH needed for 1 day.

    Give us that daily number, and then we can calculate the battery and inverter needed.

    Unless storms take out your power on sunny days, PV won't help a lot, a regular battery charger is better.

  6. #6
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    Default PV

    Explain PV. Also, where would I get a killawatt meter and are they expensive? Also isn't DC power created by solar panels? Why would I need an inverter - my c-pap is AC or DC with a different cord and I believe I can purchase a DC powered fan?

    thanks
    Last edited by pzed; 03-24-2012 at 12:03 PM. Reason: new question

  7. #7
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    Quote Originally Posted by pzed View Post
    Explain PV. Also, where would I get a killawatt meter and are they expensive?
    PV means a solar panel etc

    A Killawatt can be found on line or at any big box store I expect - I just saw 16$ on the net

  8. #8
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    Default another question please

    Quote Originally Posted by pzed View Post
    Explain PV. Also, where would I get a killawatt meter and are they expensive? Also isn't DC power created by solar panels? Why would I need an inverter - my c-pap is AC or DC with a different cord and I believe I can purchase a DC powered fan?

    thanks

  9. #9
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    Quote Originally Posted by pzed View Post
    Explain PV. Also, where would I get a killawatt meter and are they expensive? Also isn't DC power created by solar panels? Why would I need an inverter - my c-pap is AC or DC with a different cord and I believe I can purchase a DC powered fan?
    thanks
    PV = Photo Voltaic solar panel. (not a thermal heating solar panel)

    Kill-a-watt meter
    http://www.amazon.com/P3-Internation.../dp/B00009MDBU

    You will have to research for yourself, if you obtain better efficiency, or better performance, with a DC or AC fan. YOU need to measure the draw both ways, and decide what You want.

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