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

Jerry Shafer jerrysgarage01 at gmail.com
Sun Nov 30 18:33:25 PST 2014


i may have missed this question is the inverter on "Search Mode" or is it
in the "On" position i have had sound equipment act up is the search mode,
reading the second inverter turning on fits this also I will only keep my
inverters in the On position
Jerry

On Sun, Nov 30, 2014 at 2:29 PM, <dan at foxfire-energy.com> wrote:

> We're still not at the bottom of it. Seems Mitsubishi is doing their level
> best to finger the RE system. Yes, the current wave form (On a Fluke 43
> Power Analyzer) has a shoulder.. looks down right funky on one inverter
> thru the X240 until the 2nd inverter lights. Current also looks funkular
> when each mini split is lit (Pulses).. Still, I'm thinking it's more about
> how the mini splits toke power rather than how the Outbacks produce power.
> The voltage waveforms look fine.
>
> the other chin scratcher is that it seems this model of mini split has
> only been around since spring. There might be a model specific cold weather
> setup the AC folks missed. Something about a jumper on a control board that
> needs to be snipped to enable the compressor heater.
>
> We also noticed that all mini splits work just fine if you leave them on
> and turned down.. But that kind of power draw for folks that have been
> loving off grid since 92 is just unacceptable. (these guys were turning off
> GFI breakers because they could see a draw).
>
> Either way, the power system itself is working fine as is everything else
> in the house. And no, the new power system has not kept the lawn mower from
> starting or the dog from eating the cats food.
>
> Peace. db
>
> Dan Brown
> Foxfire Energy Corp.
> Renewable Energy Systems
> (802)-483-2564
> www.Foxfire-Energy.com
> NABCEP #092907-44
>
>
>  -------- Original Message --------
> Subject: Re: [RE-wrenches] Mitsubishi Mini Split fighting with Outback
> VFX Off Grid
> From: Wayne Irwin <wayne at pureenergysolar.com>
> Date: Tue, October 21, 2014 8:52 pm
> To: Wrenches <re-wrenches at lists.re-wrenches.org>
>
> 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,
> President
> License #CVC56695
> State Licensed Solar Contractor
> Pure Energy Solar International Inc.
> Wayne at PureEnergySolar.com <PureEnergySolar at hotmail.com>
>  <http://pureenergysolar.net/>http://PureEnergySolar.com
> http://SolarChargingStation.net <https://solarchargingstation.net>
> 352 377-6527 Office
> 352 336-3299 Fax
> 352 316-1637 Cell
>
> The Sun Is Always Shining!
>
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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 Engineer303 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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