Solar Boost 2000E input voltage

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  • mike95490mike95490 Solar Expert Posts: 8,470 ✭✭✭✭✭
    Re: Solar Boost 2000E input voltage

    See this post
    http://forum.solar-electric.com/showthread.php?p=25841&highlight=lensing#post25841
    about solar / cloud / lensing effect. It does happen, and coupled with the cool panel, and bright edge, you get a brief boost. A MPPT controller should handle it fine, only lasts a couple seconds, I don't know how a PWM controller would deal with it - fine, or fry?
    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 ,

  • BB.BB. Super Moderators, Administrators Posts: 29,717 admin
    Re: Solar Boost 2000E input voltage

    In general, a good quality MPPT controller will "manage" it output current and internal temperatures even with presented with an edge of cloud event (the MPPT is designed to self limit)--so I would not worry at all.

    A PWM solar charge controller does not need to "know" its output current--so the less expensive ones may have an issue...

    However, current for a solar panel actually drops a tiny bit as the panels cool off (current output is pretty much flat with temperature for our needs here).

    The Edge of Clouds event is both a lensing and a temperature effect (increasing voltage from cool panels and somewhat increasing current due to lensing)--and since a PWM charge controller cannot convert the "voltage rise" into added current output--the Edge of Cloud effect would be much less noticeable for a PWM controller.

    So--I would doubt that a good quality PWM controller would be affected much (if at all) by such an event.

    -Bill
    Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
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