Forum Discussion

janstey58's avatar
janstey58
Explorer
Jan 04, 2017

Magnum inverter/charger not charging batteries

I am plugged into 10A A/C outlet with adapters to the 50A shore cord and not getting any charge to batteries. The transfer switch lights red when I plug in the 10A cord, but no power to the inverter. Do I need to have the Magnum inverter button "on" to charge?? Is there something I am missing, worried the batteries will freeze here with temps in the single digits. Thx! Jeff
Class A
  • donkeydew's avatar
    donkeydew
    Explorer
    Jan 04, 2017
    what size and how long is the cord are you running from your 10amp outlet?
  • GordonThree's avatar
    GordonThree
    Explorer
    Jan 04, 2017
    My Magnum has two buttons, one labeled Charger and the other label Inverter.

    It will not charge without the Charge button being on. If shore power is available and the charger off, the charge light will be blinking.

    Does this sound like your setup?
  • janstey58's avatar
    janstey58
    Explorer
    Jan 05, 2017
    No, I only have once button on/off for inverter. And a green light when the inverter is on, and 2nd light for Fault.
  • Mr_Mark1's avatar
    Mr_Mark1
    Explorer
    Jan 05, 2017
    Mr. Jeff,

    Can you post a picture of your inverter read-out inside the motorhome?

    If you have the same type controller inside like we had, when you select '20 amp' showing on the read-out, you have to PUSH the round button to select it that you rotated to get to 20 amp.

    MM.
  • janstey58's avatar
    janstey58
    Explorer
    Jan 05, 2017
    My selections are 5, 15, 30 and 50A and I have tried them all. The system worked fine when camping at a 50A pedestal, so thinking my input A/C must be not to the systems liking? Praying I dont have frozen batteries in the AM, it is going down to 5 deg tonite.
  • Jim's avatar
    Jim
    Explorer
    Jan 05, 2017
    If your batteries are only a few years old, they'll be fine. The acid prevents freezing. If you're not living in the RV, just disconnect their ground wires. You've got plenty of time to work on the converter issue.
  • janstey58's avatar
    janstey58
    Explorer
    Jan 05, 2017
    Figured it out, I used a heavier ext cord to plug into 10A plug, so the voltage drop must have been too much with the lighter cord. Glad I am now charging in this frigid weather, thanks all!!

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