Air Conditioning not keeping up

[km1125]

Source of the post
Before doing that, I measured the air temperature coming out of the AC unit and it was between 45 and 50 degrees, so I don't think efficiency is a problem.

What was the temperature at the input to the unit? (or the temperature of the cabin?)

Also, if you have an IR thermometer you can measure the temp of the discharging water and also the local water temperature to see what the rise in temp is. If you then measure the water flow, you have a pretty good measurement of how many BTUs the unit is actually processing.

[dtcom]

Source of the post Are you sure about that? Some have the drain regardless, but will evaporate the condensation if you don't have the drain hooked up. The drain is required if the unit supports heating mode. The evap makes a huge difference... ~8,000 BTUs for every gallon of condensate that gets evaporated!!

What is the actual model of the unit?

Midea 8,000 BTU ASHRAE (5,300 BTU SACC) Portable Air Conditioner.
The manual says the water will fill the container and must be drained. I didn't realize that this was a "feature" of this unit when I ordered it.
A reviewer said that the water tank filled up within about 4 hours of operation.

https://www.amazon.com/dp/B087CQVC9G?ref=ppx_yo2ov_dt_b_product_details&th=1

[dtcom]

Source of the post What was the temperature at the input to the unit? (or the temperature of the cabin?)

The cabin was about 80 degrees.

[km1125]

Source of the post
Midea 8,000 BTU ASHRAE (5,300 BTU SACC) Portable Air Conditioner.
The manual says the water will fill the container and must be drained. I didn't realize that this was a "feature" of this unit when I ordered it.
A reviewer said that the water tank filled up within about 4 hours of operation.

https://www.amazon.com/dp/B087CQVC9G?ref=ppx_yo2ov_dt_b_product_details&th=1

Wow.. I'm surprised they still make them without the "evaporative" feature. Wonder if they have to pay to license that "technology"? I know some folks used to set them up so the drain could be run into a sink and then directly overboard. You might also be able to run a hose down to your shower sump.

Source of the post What was the temperature at the input to the unit? (or the temperature of the cabin?)

The cabin was about 80 degrees.

Well that's good... ~35 degree difference is pretty normal, but can vary with fan speed.

[bud37]

dtcom.....It seems your AC unit is working as good as it can IMO....It just can't deal with all the radiant heat generated inside.
Later models of that boat came with two AC systems installed if they were being shipped to warmer spots. The one we had only had one but it was shipped to Canada....I will say though that all the wiring / mounting etc was in place , just not the unit itself. I can also say we also had trouble when it was 90+ and humid.

[dtcom]

Source of the post It seems your AC unit is working as good as it can IMO.

Thanks. That is my take. Hopefully the portable AC unit will pick up the slack, and I can turn it on remotely to have the boat somewhat cooler when I get to it.