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DC DC voltage stepdown to charge batteries?

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  • DC DC voltage stepdown to charge batteries?

    I have a 600V array which is used once in a while to drive a 3 phase pump via a VFD. When it's not running I'd like to use it to power small tools. I've looked into putting in a single phase VFD on a changeover or a charge controller that can take a 600V input but they are out of my budget.

    DC DC voltage converters are cheap. Would it make sense to step down the 600V to, say, 100V and then wire into cheaper charge controllers?

  • #2
    No. Next question. Buy a high voltage charge controller. If you cannot afford to pay, you cannot afford to play.
    MSEE, PE


    • #3
      600VDC is nothing to fool with. I'd suspect most DC-DC downconverters don't have any provision for "stall" when the PV is overloaded and crashed the voltage. I've done 60V to 12V, with 500w modules, but those were also $200 modules. I think 600V is going to be pretty pricey.
      post a mfg's link to a candidate module .
      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