Asking for help

System
System Posts: 2,511 admin
in Solar Beginners Corner #1
HI TO ALL.;)

5 -7w lights 12v
Laptop-watt?just plan on avg for one.....4hr day.
Small t.v. 12v with dish? 4hr day.

What system for off grid would i need?

THANK'S
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  • System2
    System2 Posts: 6,290 admin
    #2
    Re: Asking for help
    sun wrote: »
    HI TO ALL.;)

    5 -7w lights 12v
    Laptop-watt?just plan on avg for one.....4hr day.
    Small t.v. 12v with dish? 4hr day.

    What system for off grid would i need?

    THANK'S

    Sorry.

    Loc- AK summer, just something that can be for short term.

    Have a honda 2000 for backup also.

    Thanks again.
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  • mike95490
    mike95490 Solar Expert Posts: 9,583 ✭✭✭✭✭
    #3
    Re: Asking for help

    Is this a 24/7 house, or a weekend cabin ? What city ?
    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 ||
    || Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
    || VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A

    solar: http://tinyurl.com/LMR-Solar
    gen: http://tinyurl.com/LMR-Lister ,

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  • System2
    System2 Posts: 6,290 admin
    #4
    Re: Asking for help
    mike90045 wrote: »
    Is this a 24/7 house, or a weekend cabin ? What city ?

    Cabin for 24/7 for 3 weeks outside Anchorage.

    Thank's:D
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  • mike95490
    mike95490 Solar Expert Posts: 9,583 ✭✭✭✭✭
    #5
    Re: Asking for help

    for only 3 weeks a year, solar is a Expensive investment. you may want to consider a small generator and battery backup system, you can buy a generator for the price of 2 panels.

    There is a long thread here
    http://forum.solar-electric.com/showthread.php?t=3144
    that you should read, figure out some load numbers for your use, and then we will have something to work with.
    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 ||
    || Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
    || VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A

    solar: http://tinyurl.com/LMR-Solar
    gen: http://tinyurl.com/LMR-Lister ,

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  • al128
    al128 Solar Expert Posts: 65 ✭✭✭✭
    #6
    Re: Asking for help
    sun wrote: »
    HI TO ALL.;)

    5 -7w lights 12v
    Laptop-watt?just plan on avg for one.....4hr day.
    Small t.v. 12v with dish? 4hr day.

    What system for off grid would i need?

    THANK'S




    lets see:

    4 pcs - 7w lights x 8hrs on: 220w
    notebook 35w x 4hrs: 140w
    tv: 60w x 4hr: 240w

    TOTAL: 600wh per day for 2 days reserve (assumption) = 1200wh


    1200wh are 100ah in 12V - so you'd need a 200ah battery bank, cos you dont want to go below 50% depth of charge.

    to replenish the 50ah (daily consumption) you'd need about 150-200w "nameplate" worth of solar panels - if you can get 4 hrs of full sun - if not - you'd need 200+w

    then you'd need a charge controller and an inverter and the batt's and the PVs.

    so, doing the math - a gen is a better option, b/c managing a battery bank off-site is risky (they prob. cr@p out on you the next time you get up there ;)) and expensive

    also you might want to consider the risk of PVs and stuff get stolen (a gen is way more stealth in a cabin far off)

    probably not what you wanted to hear

    cheers
    al
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