[RE-wrenches] EG4 Mini Split

Thu Jun 19 12:09:24 PDT 2025

In Minnesota we are essentially limited to 40 kW of grid tied net metered
solar. But there is no limit on non-grid connected. So if I had mini splits
that were directly solar powered that would reduce my electricity
consumption so I could sell it instead of use it.

In my case with my ICF construction house that weighs a million pounds the
PV direct air conditioning would be great because all we need to do is keep
the average interior temperature low and the house has enough thermal mass
too balance things out.

thank you,

-James Jefferson Jarvis
APRS World, LLC
+1-507-454-2727

(apologies for the brevity and spelling...from my phone)

On Thu, Jun 19, 2025, 2:02 PM Jason Szumlanski via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> I can see the redundancy reason. There does not seem to be an economic
> reason to do this, especially if you are on-grid or already have a suitably
> sized off-grid or backup system. Just use a regular mini-split seems more
> logical.
>
>
> Jason Szumlanski
> Principal Solar Designer | Florida Solar Design Group
> NABCEP Certified Solar Professional (PVIP)
> Florida State Certified Solar Contractor CVC56956
> Florida Certified Electrical Contractor EC13013208
>
>
> On Thu, Jun 19, 2025 at 2:35 PM Dave Angelini Offgrid Solar via
> RE-wrenches <re-wrenches at lists.re-wrenches.org> wrote:
>
>> The EG4 is not a bad split. Reason my client wanted it was a redundant
>> cooling back-up if his battery/inverter/solar went down.
>> Definitely run AC to it from the main system. Getting close to the
>> solstice and solar can power this well into the evening😎
>>
>>
>>
>> *Dave Angelini Offgrid Solar
>> "we go where powerlines don't"
>>    <http://members.sti.net/offgridsolar/>https://offgridsolar1.com/ <https://offgridsolar1.com/>  <http://members.sti.net/offgridsolar/>
>> e-mail  offgridsolar at sti.net <offgridsolar at sti.net>
>> text 209 813 0060*
>>
>>
>> On 2025-06-19 10:53 am, William Miller via RE-wrenches wrote:
>>
>> There are two reasons I could see:
>>
>>
>>
>> ·        Your existing PV rating is too small.
>>
>> ·        You do not have any existing PV and you do not want to incur
>> more utility expenses.
>>
>>
>>
>> I do see a real limitation to direct-DC air conditioning (which I think
>> is what we are discussing):  No AC when the sun is not high in the sky.
>> That alone makes this impractical
>>
>>
>>
>> William
>>
>>
>>
>> Miller Solar
>>
>> 17395 Oak Road, Atascadero, CA 93422
>>
>> 805-438-5600
>>
>> www.millersolar.com
>>
>> CA Lic. 773985
>>
>>
>>
>>
>>
>> *From:* RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org] *On
>> Behalf Of *Jason Szumlanski via RE-wrenches
>> *Sent:* Thursday, June 19, 2025 10:25 AM
>> *To:* RE-wrenches
>> *Cc:* Jason Szumlanski
>> *Subject:* Re: [RE-wrenches] EG4 Mini Split
>>
>>
>>
>> I guess the secondary question is why would anyone use this system anyway
>> in a grid interconnected environment. The only rationale I could see is to
>> have some level of air conditioning when the sun is shining without having
>> to go through the expense of adding a hybrid inverter and batteries. But by
>> the time you install solar panels with a rapid shutdown system, the return
>> on that investment seems terrible considering that much of the solar energy
>> generated will be wasted unless you somehow need maximum cooling from this
>> unit 365 days a year during the daylight hours.
>>
>>
>>
>>
>>
>>
>>
>>
>> Jason Szumlanski
>>
>> Principal Solar Designer | Florida Solar Design Group
>> NABCEP Certified Solar Professional (PVIP)
>> Florida State Certified Solar Contractor CVC56956
>>
>> Florida Certified Electrical Contractor EC13013208
>>
>>
>>
>> On Thu, Jun 19, 2025, 6:15 AM Jason Szumlanski <
>> jason at floridasolardesigngroup.com> wrote:
>>
>> I'm getting requests to install 4-6 panels for these mini-splits. I'm
>> saying no so far, but it got me thinking... What are people doing for rapid
>> shutdown for these systems? I can't see them being exempt. The manual is
>> silent on the issue. It just shows a DC isolator from the panels to the
>> point of connection in the unit.
>>
>>
>>
>> Jason Szumlanski
>>
>> Florida Solar Design Group
>>
>>
>>
>>
>>
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