Reply
 
Thread Tools Display Modes
 
Old 05-24-2018, 06:40 PM   #1
Mini-Skoolie
 
Join Date: Apr 2018
Posts: 13
Constructive Solar AC ideas

With all of the opinions surrounding solar ac, lets try to have some constructive conversation here. If you donít think itís possible, no worries, just move on to the next thread.

If youíd like to have a discussion about designing a solar system around being able to boondock with ac with minimal generator use or want to theorycraft on ideas surrounding massive solar arrays and massive battery banks, letís go ahead and talk it out.

With that being said, the good news is, even if no-one else is able to or wants to actually try building a system like this right now, Iím pretty much up for the challenge by default. Iím beginning a build on a 40íer right now and have a very high solar power budget to meet some requirements for my families lifestyle. So as the build and thread progresses I would be able to design our actual power system and document the components and processes to help further the topic.

Letís talk. What kind of system would you design?
Flowstatebus is offline   Reply With Quote
Old 05-24-2018, 06:51 PM   #2
Bus Crazy
 
ol trunt's Avatar
 
Join Date: Apr 2012
Location: So Cal
Posts: 2,158
Year: 1935
Coachwork: Superior
Chassis: Chevy
Engine: 317 ci/tid / Isuzu
Seems you've given this much thought so why not just go ahead and lay out your proposal and lets see where that goes. Jack
ol trunt is offline   Reply With Quote
Old 05-24-2018, 06:51 PM   #3
Bus Geek
 
Join Date: Sep 2017
Location: Owasso, OK
Posts: 2,627
Year: 1999
Coachwork: Thomas
Chassis: Saf-T-Liner MVP ER
Engine: Cummins 6CTA8.3 Mechanical MD3060
Rated Cap: 46 Coach Seats, 40 foot
Every discussion around power installations starts with an Energy Audit.

You need to know two things:

1. How much power will my appliances consume in a 24-hour period?

2. How many days do I want to be off-grid.

#1 is a bit flexible as you could run more economically if you needed to ... so maybe two power schemes. One for "sod it let's just run everything" and another for"how frugal can we be if we have to".

Once you have the hard numbers you can start to think about where the power will come from.

Be realistic about the amount of amp-hours your batteries will actually receive from a solar installation, and balance the need to help the panels out with a generator at times of either peak demand or lower sunshine.

Throwing AC into the mix is possible, but be aware that it is an enormous demand that would mean designing just for that as everything else would be relatively small in comparison ... and that is why most people don't do it unless they expect to be hooked to shore-power or run a genny. It's not that it isn't possible, it's that it is very expensive and needs a great deal of roof real-estate to even fit the panels.

The technical side of the installation is a completely separate conversation, and some of the decisions you make will affect the efficiency of the system and its cost.

Things like tiltable or fixed panels, MPPT charge controller(s) or not. Parallel or series wiring, Mono or polycrystalline. Well you get the drift.

Just my 2c ... it's worth what you paid for it
__________________
Steve Bracken

Build Thread
Twigg is offline   Reply With Quote
Old 05-24-2018, 07:21 PM   #4
Mini-Skoolie
 
Join Date: Apr 2018
Posts: 13
Quote:
Originally Posted by Twigg View Post
Every discussion around power installations starts with an Energy Audit.

You need to know two things:

1. How much power will my appliances consume in a 24-hour period?

2. How many days do I want to be off-grid.

#1 is a bit flexible as you could run more economically if you needed to ... so maybe two power schemes. One for "sod it let's just run everything" and another for"how frugal can we be if we have to".

Once you have the hard numbers you can start to think about where the power will come from.

Be realistic about the amount of amp-hours your batteries will actually receive from a solar installation, and balance the need to help the panels out with a generator at times of either peak demand or lower sunshine.

Throwing AC into the mix is possible, but be aware that it is an enormous demand that would mean designing just for that as everything else would be relatively small in comparison ... and that is why most people don't do it unless they expect to be hooked to shore-power or run a genny. It's not that it isn't possible, it's that it is very expensive and needs a great deal of roof real-estate to even fit the panels.

The technical side of the installation is a completely separate conversation, and some of the decisions you make will affect the efficiency of the system and its cost.

Things like tiltable or fixed panels, MPPT charge controller(s) or not. Parallel or series wiring, Mono or polycrystalline. Well you get the drift.

Just my 2c ... it's worth what you paid for it
Thank you for this copy and paste but this is intended to be more of an open discussion than what every other solar ac thread inevitably turns into.

If youíd like to discuss actual technical points of a system that could handle various amounts and types of ac units, and for various amounts of time, letís do that. Or any other relevant topic to large solar systems, letís discuss that.

Thank you for the obligatory warning post though. I am not at all trying to sound condisending, just hoping to better define the scope of the thread.
Flowstatebus is offline   Reply With Quote
Old 05-24-2018, 07:24 PM   #5
Mini-Skoolie
 
Join Date: Apr 2018
Posts: 13
Quote:
Originally Posted by ol trunt View Post
Seems you've given this much thought so why not just go ahead and lay out your proposal and lets see where that goes. Jack
My thought was actually not to open with my proposed plans as the thread would then steer in the direction of my build right off the bat. I was hoping to have a more unbiased untainted discussion about systems (and people’s thoughts on components) that can handle that load.
Flowstatebus is offline   Reply With Quote
Old 05-24-2018, 07:30 PM   #6
Bus Crazy
 
brokedown's Avatar
 
Join Date: Dec 2016
Location: St Petersburg, FL
Posts: 1,825
Year: 1997
Coachwork: Bluebird
Chassis: TC2000 FE
Engine: Cummins 5.9
Rated Cap: 72
I'm 100% with Twigg. Figure out how much power you need, We can't guess that for you. There is a level of power generation and storage where solar can do the job, no question about that. Your requirements will dictate your needs. Just don't say this is for a short bus.
__________________
Keep up with us and our build!
Follow us on Facebook, Instagram, and Twitter
brokedown is offline   Reply With Quote
Old 05-24-2018, 07:34 PM   #7
Mini-Skoolie
 
Join Date: Apr 2018
Posts: 13
I’m not asking for help building MY build. I’m asking for the forum community to have a constructive thread based around solar AC. So far, it’s off to a rocky start, though.
Flowstatebus is offline   Reply With Quote
Old 05-24-2018, 07:43 PM   #8
Bus Nut
 
Whatthefak's Avatar
 
Join Date: Apr 2018
Location: Wisconsin N.E.
Posts: 409
Year: 2000
Coachwork: Thomas
Chassis: Thomas
Engine: 5.9
Rated Cap: 72
Someone did mention the small efficient dc units from a Prius, idk the btu on them or if they are anymore efficient than a good minisplit but it seems workable for a well insulated bedroom
Whatthefak is offline   Reply With Quote
Old 05-24-2018, 07:45 PM   #9
Skoolie
 
Drew Bru's Avatar
 
Join Date: May 2016
Location: Illinois
Posts: 245
Year: 1996
Coachwork: Amtran
Chassis: International
Engine: DT466
Rated Cap: 65
Maybe I'm missing something, but it seems like it should be fairly easy to figure out?

  • How much energy does an AC system require?
  • How much battery storage is required to power the AC system?
  • How much solar energy do you need to recharge the batteries that power the AC system?
Once you have those numbers, the only real variable is the temperature.


So then, you size the AC system based on your room size and size the solar & battery bank accordingly.

Then again, I could very well be missing something due to faulty logic.
__________________
Our Build: https://dazzlingbluebus.wordpress.com/
Drew Bru is offline   Reply With Quote
Old 05-24-2018, 07:50 PM   #10
Skoolie
 
ComfortEagle's Avatar
 
Join Date: Dec 2017
Location: Southern Maryland
Posts: 212
Year: 1986
Coachwork: Gillig
Chassis: Phantom
Engine: Cat 3208/Allison MT643
Rated Cap: 2 Humans + 2 Chihuahuas
Quote:
Originally Posted by Flowstatebus View Post
Iím not asking for help building MY build. Iím asking for the forum community to have a constructive thread based around solar AC. So far, itís off to a rocky start, though.
"Rocky start..." funny. #foolserrand

I plan to run a mini split off mine. 2600W on the roof, 18.4kWh of lithium, and a Magnum Energy 4000W inverter.
ComfortEagle is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


» Featured Campgrounds

Reviews provided by

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 03:13 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2018, vBulletin Solutions, Inc.