48 volt dc air conditioner and solar needs chart

[pianotuna]

Hi,

A rather nice chart based on 560 watts of load:

solar panels required

Thanks for catching my error smk.

[time2roll]

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.

[pianotuna]

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

[time2roll]

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.

[MEXICOWANDERER]

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.

[pianotuna]

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.

[time2roll]

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.

[JiminDenver]

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.