solar panel and 1 motor install question

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • buercky
    Junior Member
    • Oct 2011
    • 5
    #1

    solar panel and 1 motor install question

    NOTE NOVICE here

    I am hooking up JUST a 12vdc motor .200ma no load .45ma load to 1 10watt solar panel (.59ma) (18v)nominal and have a question or 3.


    1. do i need a diode to block the voltage/amps created by my the motor from going back to the solar panel for if i spin it manually i see flow. ?

    2. is it best to have a +12V voltage regulator (L7812CV) in series to drop the voltage to the motor since it rated at 12v? because when i measure voltage while motor is running its 11.8v (without regulator) but if i disconnect the motor the voltage jumps up to the nominal 18v.?

    thanks
    Tags: solar panel motor
    • Mike90250
      Moderator
      • May 2009
      • 16020
      #2
      No diode needed, unless you are really going to spin that motor up. (and if you have a way to spin it up, why do you need the solar?)

      You don't need a regulator either. You could put a 20W 13V zener diode in to limit max voltage if you want, but the motor will load the panel down pretty good.

      You may have a problem in low light levels, of your motor not starting, and the panel cooking one set of windings, till the motor starts up.
      Powerfab top of pole PV mount (2) | 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

        Comment

        • buercky
          Junior Member
          • Oct 2011
          • 5
          #3
          Originally posted by Mike90250
          No diode needed, unless you are really going to spin that motor up. (and if you have a way to spin it up, why do you need the solar?)

          You don't need a regulator either. You could put a 20W 13V zener diode in to limit max voltage if you want, but the motor will load the panel down pretty good.

          You may have a problem in low light levels, of your motor not starting, and the panel cooking one set of windings, till the motor starts up.
          thank you very much for the helpful info.. this all helps.


          I have a thermal switch that wont switch on till it hits a certain temp. So this should help a little BUT any way around the ? panel cooking one set of windings, till the motor starts up

          so your saying on those low light days it will burn up my motor.? crud:O(

          so how do the solar attic fans get around it?

          what about a dc-to dc stepup like this http://www.lightobject.com/DC-to-DC-...ator-P498.aspx

            Comment

            • Mike90250
              Moderator
              • May 2009
              • 16020
              #4
              You should look into a brushless DC motor, with constant auto retry. But to discover deep in the specs, which motors retry, and which give up after 2 tries, is tough. Motor should consume about 60% of PV nameplate, and be able to take a range of voltage.
              Powerfab top of pole PV mount (2) | 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

                Comment

                • buercky
                  Junior Member
                  • Oct 2011
                  • 5
                  #5
                  Originally posted by Mike90250
                  You should look into a brushless DC motor, with constant auto retry. But to discover deep in the specs, which motors retry, and which give up after 2 tries, is tough. Motor should consume about 60% of PV nameplate, and be able to take a range of voltage.
                  yea that i have been doing but im on low wattage might you know of sites that have for 10 watt solar .59a only found one so far...


                  i also wasnt thinkin on that step up what i need is one that would adjust to a hi or lo which i found out the term is BOOST and BUCK UP and down... I have a little more testing to do on my AMPrage at teh low voltage because if im sure they both will drop when volt drops due to Shade.. but lokig more at teh brushless if i can find some :O)
                  thanks again

                    Comment

                    Previous template Next
                    Working...