Input and Output HPP wired to removed battery leads?

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offgrid
offgrid Member Posts: 3 ✭✭

I am removing the old coach battery in my RV and replacing it with my new Yeti 1000x. The easiest would be to extend the old battery positive and vehicle ground into the front of the passenger compartment and wire them to BOTH the input HPP (Anderson) and the output HPP of the Yeti. Then, the Yeti would power all of the coach components when needed, and the vehicle isolator would push voltage to the Yeti when driving. Two questions:

  1. Would having both the input and output wired to where the battery used to be, be bad?
  2. If so, what about only keeping the Yeti output connected to the removed battery leads, and charging from the 12V cigarette lighter? i.e., what happens if voltage is applied across the output HPP on the Yeti?

Best Answer

  • jg164
    jg164 Administrator, Moderator Posts: 313 admin
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    @offgrid,

    I get that you already have a 1000X and would like to use it like a 12V battery as much as possible. Here are some things to think about.

    a) Keep in mind the 12V output of any Yeti with HPP output is 13.5V Unloaded and can sag to 12.5V when running at max power which is capped at 30 Amps max for a total of 375 Watts. In comparison, Deep cycle batteries can handle hundreds of Amps for surge and at least 80A continuous load and at least 30A charging.

    b) When an engine is running, most alternators put out 13.8-16V depending on the size of the engine and length and thickness of the wires at the point of use. This higher voltage is needed to charge the 12V battery. The 12V output of the Yeti is NOT designed to be compatible with an alternator connected to it. The designed RV/Van use is to have a Yeti 1500X powering cabin 12V loads from its HPP port to a fused distribution block such as like fans, lights, a heating blanket and maybe a diesel heater blower but only take input to the yeti from the alternator via a Yeti Link which is designed to take in alternator power and voltage and has its own charge path to the Yeti internal Lithium battery. The Yeti Link is not compatible with the Yeti 1000X. Your only option with it is to use a regulated car charger from a cig port into the 8mm port of the Yeti.

Answers

  • jg164
    jg164 Administrator, Moderator Posts: 313 admin
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    @offgrid,

    The Yeti is not a drop-in replacement for a 12V battery. Keep inputs and outputs separate. Please see my comment on this other post for more details.

    Does that help?

  • offgrid
    offgrid Member Posts: 3 ✭✭
    edited May 29
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    Thanks. Yes, keeping inputs and outputs separate makes sense. I kinda figured that.

    Your other post is helpful for chaining an AGM and Yeti, but that's not what I'm doing. I'm replacing my Deep Cycle Marine Battery with a Yeti. To expand on my 2nd question:

    a) If I plug the Yeti HPP output into where the Marine Battery was, it should power everything normally. That's my normal "Load" state when the engine is off.

    b) When the engine is running, though, the vehicle would usually apply voltage across that connection (at least when there's a Marine Battery attached). Will having that alternator voltage across the Yeti HPP OUTPUT damage it, or is the output controller smart enough to prevent that voltage from feeding back into the Yeti? In other words, how concerned to I have to be about disconnecting the Yeti from the vehicle before starting it?

  • offgrid
    offgrid Member Posts: 3 ✭✭
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