[RE-wrenches] Mitsubishi Mini Split fighting with Outback VFX Off Grid

[Wayne Irwin]

We have found that the mini-splits have only had issues while gen sets are running. 
In some cases (when on genset) the mini's will run irregularly or flash a fault status.

Rather than try to have the mini's run on gen power we install dc chargers to charge batts from gen power.

My thought is that the AC Installer either has something wrong or the Mitsubishi's have very tight parameters.
Be sure that the wiring from the inside unit to the outside unit are correct. Should be only three wires (plus gnd). Very easy to check.

Possible alternative solution would be look into the cost of installing a Gree since they are the least expensive.
 


Wayne Irwin,
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State Licensed Solar Contractor
Pure Energy Solar International Inc. 

Wayne at PureEnergySolar.com
 

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Date: Tue, 21 Oct 2014 11:23:31 -0600
From: ray at solarray.com
To: re-wrenches at lists.re-wrenches.org
Subject: Re: [RE-wrenches] Mitsubishi Mini Split fighting with Outback VFX Off Grid


  
    
  
  
    The Outback is not a perfect Sinewave. 
      It still has tiny steps in the wave, and when electronics have a
      problem, its usually with the wave form as it crosses zero voltage
      .  Instead of being instantaneous, it has a few milliseconds of
      time the wave is at the zero crossing, which can drive some
      electronics nuts.  I don't understand the issue beyond that, but
      apparently the electronics use the zero crossing for timers and
      synchronizing, and they're looking for an instant "click", not a
      smear.  

      Do the heat pumps work with the generator?  Even though generators
      can have more harmonic distortion, they do usually have a clean
      zero crossing.

      If this is the case, I'm afraid I don't have a cure.  We used to
      use capacitors, but Dan from Exeltech just poo pooed that fix in
      another recent thread, so I don't have any other tricks up my
      sleeve.

      R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer, 
Licensed Master Electrician
Solar Design Engineer
303 505-8760
      On 10/21/2014 8:54 AM, dan at foxfire-energy.com wrote:

    
    
        Anyone else had issues with Mitsubishi Mini Split heat
          pumps fighting with Outback VFX off grid inverters? Everything
          is brand new. Outback VFX7248, three separate heat pumps. The
          heat pumps shut down reporting multiple / confusing input
          commands. The heat pump guys want to blame the power system.
          I'm thinking bad Sushi. Thanks db

        
        

        
        

          Dan Brown

          Foxfire Energy Corp.

          Renewable Energy Systems

          (802)-483-2564

          www.Foxfire-Energy.com

          NABCEP #092907-44
        
      
      

      
      

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