High Efficiency Appliances - EG4 Community Forum

12K Solar mini-Split No Longer Waking with the Sun

hfischer@pobox.com — Sat, 15 Aug 2026 22:37:31 +0000

For 18-months my 12K mini-split that is only connected to five 375W panels (no line voltage tie) has been waking with the sun and turning on to cool my garage in Baja. A few days ago it stopped waking on its own, now I have to manually start it through the app. When I do that it runs well. Does anyone know the reason this happened and a possible cure?

Unfortunately I will not be down there next to the unit for a few months, but I do have friends nearby that can do some basic testing for me if required.

Thanks for any help or suggestions.

How to force 12kBTU solar mini splits to work at full capacity in cooling mode?

Krzysiek_KTA — Sun, 21 Jun 2026 12:54:59 +0000

I have been using EG4 12k BTU hybrid mini splits (R410a) since late 2024. They work well , yet I have an issue with how the inverters modulate their compressors. It seems that the compressor power output cap is mainly driven by external temperature regardless of the temperature gap between the set indoor temp and the actual temp in the space.

The result is that during cloudy humid days when the external temperature drops below 90 deg F the power is modulated down to 40-50% (400-500w power draw from grid) and the delta T on indoor unit falls to 15-17degF.

On hot sunny days with temps reaching 100F and above both units I have can reach 80-100% capacity (750-850w power draw) and indoor unit delta T jumps up to 22-25degF in Turbo/Auto fan mode.

Question:

Is there any way to force the mini splits to to work at full capacity without modulation?

that would be very useful to cool/dehumidify quickly the space if needed even on cloudy below 90degF days.

@ EG4 Eric - Any help would be appreciated.

Brgds

New 12k hybrid blows cold AC but no heat

demodenny — Sat, 01 Nov 2025 15:33:43 +0000

My new 12k solar unit blows cold AC but no heat, I did the testing that was asked for and submitted it with an RMA request 3 weeks ago as requested without any response other than acknowledging the receipt of the request. I tried emailing customer service again asking for an update, still no response. Brand new unit, it's getting cold here and I am becoming frustrated.
This is the 3rd unit I installed in my home, the other 2 have been working great for over a year now and I am sad.
Anyone have any insight on RMA's or why the unit blows ac cold all the time? Thanks

Uninstalling Mini-Split for Warranty

davidt — Sat, 20 Sep 2025 22:05:58 +0000

I have to uninstall an EG4 12000BTU Hybrid Mini-split to return to EG4 for warranty repair/replace. Do I just go backwards from the install? Will the lines reseal or do I need to evacuate the system and save the freon? Pulling entire line set and wiring is going to be no fun. Any suggestions would be appreciated.

EG4 24000 Hybrid not drawing DC watts

davidt — Tue, 19 Aug 2025 19:28:50 +0000

EG4 24000 btu hybrid starts up and pulls both DC and AC for a brief time, then DC drops to 20 watts and bounces around between 20 and 50 watts. 8 450 watt panels supplying 390 volts hooked to unit. Unit works great on AC, but will not pull DC. Switch on AC limiter and DC shuts off completely. Purchased all from Signature Solar, spoke with customer support, they didn't like one ground connection, I fixed and now they will not answer the phone or return messages. Anybody have this problem with the DC not being used by the Hybrid Solar Mini-Split?

Hybrid mini split 12k not heating/cooling

Crimson — Fri, 15 Aug 2025 20:27:04 +0000

Just finished my install of a 12k hybrid system running on solar only but tested with AC as well. The app shows the system only pulls 120w max from solar and about 100w max from AC when I shut the solar off. Even in turbo mode with the cooling set to 61 degrees it just blows room temperature air and doesn't throw any error codes at all. Tried heating mode set to 90 degrees as well and it still just blows room temp. I leak tested all the connections while opening the valves on the outdoor unit and didn't have any bubbles. I also have a refrigerant sniffer handy from working on vehicle HVAC systems and it didn't detect anything at any of the joints in the system so I don't think it's a refrigerant problem. Anybody have any ideas or did I just get a lemon and I'll have to RMA it?

HYbrid MIni Split Condensate Pump

MJT — Fri, 11 Jul 2025 16:18:12 +0000

Good day. We are new to the forum and have been advised to check here for information, as we are working to install 4 x 24k Hybrid Mini splits, 24 REC panels and hardwired in a block building that requires the use of condensate pumps. These are not powered up yet, and have been looking to get information with little avail, regarding the signal cord "1,2,3"/power source to run a pump and an alarm source, if available, to shut down the unit if pump fails. Would anyone here have any experience on this topic?

Thanks in advance!

hybrid 12k min split LP code

rjohnson — Wed, 11 Jun 2025 14:22:41 +0000

Need some help on a solar only 12k min split unit. One time when we had to rerun the solar panels wiring the unit came back with LP on the indoor unit. turn it off and on with remote solved the issue. assume since we unplugged the cables it caused that issue

now its been a month or two and the unit come on every morning like clock work with zero interaction from me. Now for the last two days it shows the LP on the inside unit and I have to turn it off and back on to get it going. This unit is in a storage place that it has to come on automatically when the sun comes out to keep the product from getting to hot.

any ideas on why its starting to turn completely off recently? thanks

Solar Heat pump no longer working correctly following Network changes. Sig Solar and E

Wraytex — Thu, 13 Mar 2025 01:31:20 +0000

24K hybrid was working perfect. Added fiber to home and new mesh system. I needed assistance getting the thing on the new network. so I called Signature solar and they had me delete the AC from the app then rediscover. That was successful, but ever since the unit is overshooting temperature set points and indicating much more current usage than previous. I'm saying in heat mode it will keep on heating and the same for cooling. Sig solar had no solution for me and told me to contact EG4 when i called them back on this issue. EG4 responded to my support form request by telling me to get in touch with Signature Solar. System is still on line supply, no panels yet. Attached photo shows over cooling situation. 75° set point and the unit still drawing considerable current where it previously would only draw 59 watts or so. Unit bought and installed last August.

913

Compressor type?

Cazman — Fri, 31 Jan 2025 02:46:49 +0000

What type of compressor is in the EG4 9000 BTU mini split heat pump.
I googled and looked at spec sheet. 2 x rotary, or is it an inverter type?