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Thread: Running 12v appliances off a 24v pv system

  1. #21

    Default Re: Running 12v appliances off a 24v pv system

    In a SHTF situation, could one just use a small 12 volt solar panel across the output of the solar charge controller to "deceive" it into thinking that there is a battery present, then once it turns on just use it to power loads afterward connected to the charge controller's output?
    6KD210GX-LPU Panels/XW-MPPT60-150/6-GolfCartBatteries/XantrexProWatt2000/6Kw-MSW-Inverter For Well Pump/IOTA-DLS90IQ4/13kW-Honda Propane Generator & 500Gallon Tank. Lotsa Ammo.

  2. #22
    Join Date
    Nov 2011
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    Default Re: Running 12v appliances off a 24v pv system

    Quote Originally Posted by marsofold View Post
    In a SHTF situation, could one just use a small 12 volt solar panel across the output of the solar charge controller to "deceive" it into thinking that there is a battery present, then once it turns on just use it to power loads afterward connected to the charge controller's output?
    No. virtually all charge controllers need a battery to work properly. In particularly they need the capacitance of a battery. The battery can be nearly dead as long as it has some capacitance.

    By the way, the answer I have given has already been given and explained in this thread.
    --vtMaps
    4 x 235w Samsung, Outback fm60 & vfx3524 & mate, Midnite E-panel, four Interstate L16, Trimetric monitor, Honda eu2000

  3. #23
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    Default Re: Running 12v appliances off a 24v pv system

    Jim, have a read of section 10 in this manual it gives a good explanation of charging and sulphation, from a different battery maker.
    Ps they have a different view of charging AGMs

    http://www.cdtechno.com/pdf/ref/rs_02109_0911.pdf
    100% Off Grid @ 51* 46' N lat 124* 44' W long

    New House system: coming - 2 arrays @ 2240W
    CL150&Epanel 2 @140 W 12v PVs , 24V C&D AT-15P AGM @ 950Ah
    + CL150 2@120W 12 V panels, 24V C&D AT-15P AGM @ 950Ah
    Cotek ST1500W inverter, TBS 30a-24v Omni-charger, Honda Eu3000is,

    Guest cabin system: 3 - 70W panels to SB 2000e CC, with 2 - 100 ah 12v SAFT wet NiCd's , 600W TSW Inverter

  4. #24

    Default Re: Running 12v appliances off a 24v pv system

    I am new to this and don't see how these responses relate to running 12v appliances off of a 24v system. I want to run 12v lighting and water pump and radio from 24v system that runs inverter.

  5. #25
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    Default Re: Running 12v appliances off a 24v pv system

    Quote Originally Posted by GWILESKI View Post
    I am new to this and don't see how these responses relate to running 12v appliances off of a 24v system. I want to run 12v lighting and water pump and radio from 24v system that runs inverter.
    The OP wrote: " I assume you would need a 24v/12v dc stepdown converter? "

    Several others confirmed that, but suggested alternatives (super caps, battery balancer with center tap).

    Same thing in your other thread... you need a DC converter.

    The OP also asked about batteryless operation of a solar charge controller, and much of this thread is about that.

    Lesson to learn: Don't ask too many questions in one OP... it encourages a natural tendency to wander...

    --vtMaps
    4 x 235w Samsung, Outback fm60 & vfx3524 & mate, Midnite E-panel, four Interstate L16, Trimetric monitor, Honda eu2000

  6. #26

    Default Re: Running 12v appliances off a 24v pv system

    Robert, thanks for the info on the Samlex. This now gives me more options for designing my off-grid setup and gives me more flexibility in adding an inverter for AC loads.
    Just an FYI, DX Engineering is selling these and it was about $340 or so for the 60A version.
    Last edited by Mark40930; December 18th, 2013 at 22:56 PST.

  7. #27

    Default Re: Running 12v appliances off a 24v pv system

    I have been using these from Victron in the Marine environment never a issue yet.

    http://www.shop.pkys.com/DC-DC-Converters_c_14.html

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