Zamp vs Battery Tender

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Comments

  • Grumpy_G
    Grumpy_G
    Technically you can do that but it won't really charge the battery, just add some more capacity. That's because to charge you need a higher voltage than the external battery would provide. You could just plug the trailer into a Jackery or similar and use the converter to actually charge. Obviously leave everything switched to DC or gas and only use the AC power for the converter. 
  • pthomas745
    pthomas745
    This thread has a whole rundown on rigging up extra batteries (spares).  One has a Bluetti plugged into a port built inside the trailer.  Others just go right through the 7 pin plug with an easy adapter.

    2017 Outback
    Towed by 2014 Touareg TDi

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