Target 24K Watts and Temps

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Last Post by Randaltb 2 weeks ago

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Posts: 3

Randaltb

Topic starter

July 23, 2025 4:26 pm

(@randaltb)

Active Member

Joined: 3 weeks ago

I am new to the EG4 24K solar Mini split and have a couple questions.

Scenario:

With typical mini splits I usually target ~32-35F on the 410a gauge, and look for ~55F air at inside unit. (Basically condensing no frost)
I am not seeing this with this EG4 24K running solar only...
With ~1950watts (Varies 1800-2200) from PV showing in the phone app I am seeing 44F+ on the 410a and 60-63F internal air.
** F.Y.I. there is another 18K mini split in the same building that is showing the ~32f 410a and 56F inside air, so pretty sure it is not the environment etc.
I tried removing a small amount of refrigerant to bring the 410a gauge temp down and it did a bit (~37F) but internal air stayed about the same?
** I expected it to track better...

Questions:

1. Is this just not enough solar to get the compressor to full power?
* Do I need another PV panel (currently 6 x 365 watt panels)

a. Assuming low wattage, what is the minimum wattage I need to get full pressure?

2. What are typical 410a / Line/ and Internal temps for this unit?

** Am I expecting too much?

Info:

Phoenix AZ. ~103F Sunny
1500 ft single room building.
Existing 18K mini split, adding an EG4 24K to bring up the tonnage.

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Randaltb

(@randaltb)

Joined: 3 weeks ago

Active Member

Posts: 3

July 27, 2025 10:04 pm

Reply to

Randaltb

Maybe I should re-phrase the question...
I have a new clean 24K EG4 solar Mini split.
It is currently connected to ~2500 watts of PV. panel and 240 VAC. on L1/L2

Typical power in is ~1500W-1900W from PV panels and 900W-1300W on the line side.
** I know the panels will provide more, it seems the system is regulating power down.

- 105F external temps. (Arizona)
- 95F in the room
- ~55F on the 410a gauge (~140 psi)
- Suction line temp varies 62.5F - 75F
- Liquid line is sitting at ~88F
Not condensing...

- External fan exhaust temp 122F

So super heat seem fair but not great... (So I assume charge is OK...)
Based on the high room temp the reading seem OK but not great...

My issue is a have an two other brand 18K mini splits running in the same room,
Both blowing inside ~55F air in the same room...
With a 410A temps ~35F

Why isn't the EG4 24K solar Mini split doing the same?

Posts: 3

Randaltb

Topic starter

July 31, 2025 8:04 pm

(@randaltb)

Active Member

Joined: 3 weeks ago

I was hoping to hear from others that have installed this unit could share there typical values:
** Maybe this unit is as good as its going to get?

- What max DC voltage did they find worked best for a 24K unit?
i.e. Do I need to be closer to 380 or 150?

- Did the system ever run 100% for them just on PV? (Get Suction line blow 55F)

- Did the system ever run 100% for them PV. + AC 240?

- What power draw did you see on the app when it ran its best?

** I noted the spec sheet mentioned it can handle just over 3K in PV. wattage, and 380 VDC.
Being cautious, I am limiting my peak voltage just below 350 volts DC.
With these PV panels a single string (Series) should put me at ~350 volts DC and ~2650 watts.

The issue I am seeing is I have ~2650 watts of PV. and the app only shows the system ever pulling ~1515 watts.
To test these panels I put the PV. string on an MPPT charge controller and was hitting ~2400(+) watts immediately.

So why does the EG4 seem to cap out at 1500 on the same panels?
** Seems like a better usage of the panels would be to Run the PV. panels to the MPPT and just feed 240 back from the Inverters...

Notes:
I went back and adjust the refrigerant a bit (Putting back the bit I had previously removed) monitoring the temp until I got the super heat to range 7-14 degrees. which raise the 410a sat temp up to ~50F on the gauge.

This unit seems like the system is self throttling.
Not making good use of the PV. wattage, and never getting the suction line actually cold. (Seems to be running 55-70F)

F.Y.I. I am in AZ in full sun and the room is hot so I expect the compressor to pull well below 53 degrees F 410 sat...

I ran a second mini split AC to cool the room to ~80F and there was minimal change in values.
(I assumed they word trend colder)
** The inside air temp for the other AC was ~ 51.5F at the fan vs 69-75F on EG4... (Same room same time)

Question Target 24K Watts and Temps

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