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

Sun Nov 30 17:12:07 PST 2014

HI Dan,

Have you tried this on a different power source, say generator etc?
You might also try a different inverter brand just to make sure.

I once had radio noise from a magnum, some years ago.  Tried everything, in the end, I swapped it for a VFX and the problem was gone, customer was happy.

And I'm going to agree with Mitsubishi, most likely the inverter.
The OB/FX just isn't compatible with some machines.

jay

peltz power
On Nov 30, 2014, at 4:29 PM, <dan at foxfire-energy.com> <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
> <sigimg0.png>
> 
> 
> -------- 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 
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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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