Running a small 5,000 BTU 115V Window Air Conditioning Unit

[bcroe]

Winter (where it get pretty cold) is a reason for grid tie. Bank in summer, withdraw in winter. Bruce Roe

[Higher Voltage]

The big thing is tring to run the heat in the winter. Its the oppiste. no sun run at night.

[Higher Voltage]

I ran my ac this summer.Only on sunny days was it needed and usually after lunch,when the batteries have had a good charge.Whats funny is that my 5000 btu 4.6a ac unit made by Gree ran almost completely off the panels and didnt even touch the batteries.It only cools for 20 min @ 4.6 a then 1.2a just fan for 20min . Its doable. I set up my solar differently then most.

[sdold]

I deleted it because after reading it a few times, I decided it wasn't helping and that I was just venting frustration. But I still feel that way, where else can you get free professional help like this? If this was a legal forum populated by attorneys, would people be so quick to dismiss free legal advice? The answer is no, because people understand that sitting in their attorney's office for an hour will cost them $300 or more, but they have no idea what it takes to become a PE and therefore don't value the advice in the same way, but they should.

[J.P.M.]

The reason is it no longer available is because it was deleted by the person that posted it.

Not sure why sdold deleted it but I have to agree with him that some people just don't want to be helped by the professional engineers on this forum.

IMO for those that turn up their nose to this type of help is being a little pigheaded or jealous for not going out and getting their PE license.

I try to avoid getting mouthy in/around areas where I don't know enough to have an educated opinion, and share what I think I might know when/if I think it may be correct, helpful and/r informative.

Often, I've observed those lacking self confidence are more easily offended than others more mature and comfortable in their own skin, regardless of the level of their technical knowledge.

When asking/seeking advice to reduce my ignorance about something, I say thank you for the consideration, ask clarifying questions as necessary and try to learn, remembering that none of us is as smart as all of us, and also that all of us act like assholes 1X/a while.

But, IMO, it's sad when an ignorant opinion must be considered equally as valid as an informed, experienced opinion simply out of misplaced political correctness that must make all opinions equally correct. The easily hurt feelings of immature snowflakes are one bane to knowledge exchange and progress we could all do without.

[SunEagle]

This previous quote doesn't seem to appear in this string, huh?
Originally posted by sdold
....

The reason is it no longer available is because it was deleted by the person that posted it.

Not sure why sdold deleted it but I have to agree with him that some people just don't want to be helped by the professional engineers on this forum.

IMO for those that turn up their nose to this type of help is being a little pigheaded or jealous for not going out and getting their PE license.

[littleharbor]

This previous quote doesn't seem to appear in this string, huh?
Originally posted by sdold
You know, if I was one of the professional engineers here who has volunteered to help you on his own time, I'd find that last statement to be pretty damned insulting. Calling the information you've received "meaningless calculations" is effectively telling them that the time and money they've invested in their education, years in training, and passing the PE amounted to nothing. This is how you thank them? Now I know why Dereck and Russ are the way they are.

[J.P.M.]

You know, if I was one of the professional engineers here who has volunteered to help you on his own time, I'd find that last statement to be pretty damned insulting. Calling the information you've received "meaningless calculations" is effectively telling them that the time and money they've invested in their education, years in training, and passing the PE amounted to nothing. This is how you thank them? Now I know why Dereck and Russ are the way they are.

Seems that a side bennie of being a P.E. (and now retired) is having a bit of a tough skin. Can't speak for others, but I'm not insulted in the least by ignorance. If I did, I'd be insulting myself a lot. However, in others, I won't waste a lot of time on the arrogant bullheadedness that allows ignorance to persist.

[SWFLA]

Start with a manual J calculation it's all out there.

[J.P.M.]

JPM you and I know this will never happen. He does not even understand 5th grade math.

Maybe, but not mentioning it sort of seems like giving tacit approval to the ignorance and an excuse to not make it a necessary 1st step which, as you well know, usually starts by identifying a need and then defining the parameters of the need. As in: "I need a way to remove X amount of heat from this space when it's this hot". I can rag on the OP all I want, but without some constructive criticism or direction, I'm doing squat that's productive. Having said my peace, the OP can then take it or leave it as wanted.

[SWFLA]

Variable speed rotary DC inverter tough to beat. No surge current. Watt sipper once things are cooled down.

[bcroe]

How would you go about building your own A/C unit ?

I actually worked with a couple (already ancient) home cooler units in the 50s, which used a belt
to drive the compressor. Guess a DC motor could be substituted, don't know how much varying
rpm would affect the efficiency. Or do it with an automotive unit. Bruce Roe

[Sunking]

While I agree that thinking you can build your own A/C unit shows a lot of is naivety as to what the task entails, I'd add that learning how to calculate what the load to be met actually is might be a better first step to meet the goal the OP describes.

JPM you and I know this will never happen. He does not even understand 5th grade math.

[J.P.M.]

Complete hogwash. That would mean the EER would have to be 5000 Btus/ 70 watts = 71.

You would be an extremely rich man if you could do that, and the Laws of Physics would have to be rewritten. Best units made today are EER of 26 to 25. You are full of crap millennial.

While I agree that thinking you can build your own A/C unit shows a lot of is naivety as to what the task entails, I'd add that learning how to calculate what the load to be met actually is might be a better first step to meet the goal the OP describes.

[Sunking]

Also, I'm thinking on building my own air conditioning unit that would spend no more than 70 watts @12V. 500 watts it is way too much.

Complete hogwash. That would mean the EER would have to be 5000 Btus/ 70 watts = 71.

You would be an extremely rich man if you could do that, and the Laws of Physics would have to be rewritten. Best units made today are EER of 26 to 25. You are full of crap millennial.