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Help me design system for 1000w - 1300w AC unit

vegaslee

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Joined
Apr 14, 2024
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16
Location
Las Vegas, NV
Total beginner here and just starting my solar journey. Looking for advice on setting up a system to handle 1000w - 13000w continuous.

I live in Las Vegas and get about six hours of sun daily in my backyard. I would like to run a 1000w - 1300w portable AC unit during the day for those six or seven hours powered 100% via solar.

Can you help me to choose exactly what battery size, inverter size, and panels to set this up? I'm in a rental so not looking for a whole house off-grid scenario. And also budget is a concern.

I'm still learning about all this but I do understand with a system that can handle 1,300w I would have no problem powering laptops, small fans, etc if the grid goes down temporarily, so that's a plus.

Any help, advice, and recommendations greatly appreciated!
 
+1.
The 1 ton unit runs off of 120V as well, so you can plug it in if you feel the need when the sun goes down.
Much more efficient than a portable.
 
I did this same thing recently (I also live in the south), and I used a Midea U-shape window AC unit which is much more efficient than older window units because not only does it significantly reduce the window gap that you have to insulate, but it also has a variable speed compressor which has no surge at startup. I would highly recommend against a portable unit as even if you get a two-hose version (stay as far away from one hose variants as they create a vacuum in your house and draw in hot air from the outside making them completely pointless), the hot part is still “inside” your house so it’s inefficient even compared to a window unit. I wasn’t able to afford a mini split as part of my system but for anyone planning on powering AC via solar, my first recommendation would be a mini split (already mentioned in this thread, the one from EG4) and my second recommendation would be one of the Midea U shape models due to the advantages over a dual hose portable AC and even traditional window AC units. Portable AC is still an option (as I know they are usually very cheap used) and I know budget is important, but just make sure you get a dual hose version. As a last resort, you can modify a single hose version to dual hose (look up “single hose to dual hose portable AC conversion” on Google, most but not all single hose models are compatible).

For my setup, my window unit is small, it only consumes around 250W average and 800W running at full blast, I am just using it to supplement my home HVAC so it usually isn’t running at full blast. I’m using six 235W panels, a 300Ah 12V Lifepo4 battery, Victron 150/85 MPPT, and a 1000W pure sine wave inverter. Everything I got used locally (except for the 1/2” PVC conduit & cables that go from the panels to the MPPT) and my budget was around $1200 for everything (not including my own labor).

In a day of full sun, and angled correctly, you’ll probably still see about 75-80% of the rated output for panels. So if you want 1300W of continuous output, you’ll need 1600W of panels minimum. I would recommend 4x 450W panels (you can get a four pack of Renogy 450W panels on Amazon) and then mounting four panels is pretty straightforward with a DIY solution or the EG4 brightmount rack. If you get the EG4 minisplit, you won’t need an MPPT/inverter as that’s built into the mini split. The mini split takes up to 380V of solar input so four 450W Renogy panels would be 165V so it would be a good match. It’s rated to use up to 1100W so the four 450W panels should (in theory) provide all you need to power it during the day. This will be a huge cost savings as you won’t need to buy a battery (required for most inverter/MPPT combos) or a separate inverter/MPPT.
 
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