48 volt dc air conditioner and solar needs chart

pianotuna wrote:
I agree that no one who is attempting to run an air conditioner would worry about having too many watts of panels.

Yes and I think 95% conversion of rated watts getting to the air conditioner is a bit optimistic.

Hence my WAG to increase panel rating by 50%... not just to have extra.

Hi SMK,

This page suggests to me that it is 1100 watts--but I see I did not scroll far enough to the stage left--so you are right it is 560 watts.

I'll correct my errors.

solar electricity cost

http://www.geinnovations.net/Specifications.html

Check the power input specification.

12,000 BTU 560 watts
15,000 BTU 770 watts
18,000 BTU 1368 watts

The OP link gives the 95% panel to load efficiency assumption.

Math seems to be a very simplistic spreadsheet. No calculus here.

That's amazing.
My little LG 5,000 BTU window AC, sucks 600 amp hours out of my 24 volt bank every 24 hours. Wonder what I'm doing wrong? Yes, the compressor is doing 100% duty cycle.

Hi smk,

Correction of my misreading of the web page.

I agree that no one who is attempting to run an air conditioner would worry about having too many watts of panels.

12,000 BTU says 560 watt load. So the calc is just a simplistic 589w(solar) x 95% = 560w(load)

I would plan on 50% more panel than the chart shows. Need lots of battery to get through a hot night. Going to lose significant efficiency in the battery to go 24 hours even if only 18 hours run time is needed.

I wonder how they are working it out. 4 hours of sun on 589w of panel isn't going to offset 4 hours of a 1100w load even with off peak sun. The 12000 BTU unit must pull less than that, I have seen 9000 BTU mini splits that only pulled 600w and were not considered all that efficient.