12K Btu 120V Mini Splits

jap42 · July 03, 2020, 05:04:03 PM

I got one of the two mini splits running. Its in the bedroom and cooling like a champ. Granted, there is no sun out. But in 30 minuets it was dry and chilly inside. Pictures to come soon.

Jim Blackwood · July 04, 2020, 07:05:56 AM

How much does each of those units cost?
How many amps does it draw?

Jim

TomC · July 04, 2020, 07:58:17 AM

Many different units on the market. From straight cooling, to reverse cycle heating, to inverter controlled. Just get a familiar name brand. Good Luck, TomC

sledhead · July 04, 2020, 09:20:38 AM

I am a big fan of mini splits . they are so quiet and if you get the high efficient units they are amazing but more money

sure do hate the 3 roof rattlers for the noise and noise and noise and power consumption that are in the coach now

dave

chessie4905 · July 04, 2020, 11:35:41 AM

Can those mini splits cool a hot coach down as fast as roof airs?

richard5933 · July 04, 2020, 01:00:53 PM

Scott over on BGM is cooling his Silversides with a single Mr. Cool 120v mini split in the TN summer heat.

Apparently it can be done.

He does it with solar.

chessie4905 · July 04, 2020, 02:06:28 PM

Outside temp? In the shade?

freds · July 04, 2020, 02:18:32 PM

Quote from: chessie4905 on July 04, 2020, 02:06:28 PM
Outside temp? In the shade?

He has his bus in a sunny spot for maximum solar production and it's been hot an humid there. BGM has numerous videos where it is mentioned.

robertglines1 · July 04, 2020, 02:53:18 PM

I'm running them in bus-home-club house. 7 total since 2012. 9000/inverter type=8 amps steady-no surge on start. Bus has 3 total 2- 9000 and 1- 12000 (10 amp). cools/heats quick. single digits on heat and high 90's is all I have experienced. AUX(mfg) builds many of the brand names. all are 120 volt.

robertglines1 · July 04, 2020, 03:01:46 PM

around 5-6 hundred each delivered with line/install kits. Yes I run gen set down road. got to do math. Suggest single evap units. If one goes down you still have hvac.

luvrbus · July 04, 2020, 04:17:15 PM

Quote from: chessie4905 on July 04, 2020, 02:06:28 PM
Outside temp? In the shade?

Lol bring your 12,000 btu mini split to sunny AZ park your bus in the sun in the 112F heat at 4 pm now and in 30 minutes you will look like a roasted peanut ,they are great in a high humidity area here in the dry heat not so great.Roof airs work better here you don't have the 10 or 12 inch space above like on the mini splits,the AC mini splits bus people are dealing with is the ductless system the fan and the cooling unit hanging on the wall

robertglines1 · July 04, 2020, 05:41:50 PM

my bus is very well insulated including floor. I don't do over 100 and don't care for below 40 outside( gets down to single digits a few times a year) Works great here and in florida. No perfect world just the one we choose.

luvrbus · July 04, 2020, 05:57:01 PM

Quote from: robertglines1 on July 04, 2020, 05:41:50 PM
my bus is very well insulated including floor. I don't do over 100 and don't care for below 40 outside( gets down to single digits a few times a year) Works great here and in florida. No perfect world just the one we choose.

They are efficient removing humidly,in Needles the pot growers have from 100 to 150 of those units on their growing houses ,then they add make up air (evap coolers) on the roof to put the humidity back I guess those plants like high humidity and cool ,I don't understand the concept or reasoning.95 to 100 F is not bad here you know you will get a 40 to 50 degree swing from sunset to sunrise here in the valley,we get a taste of the high humidity for a few weeks and it is ugly

Jim Blackwood · July 04, 2020, 07:42:26 PM

So that's about $500 a ton I guess, maybe more. And about 10 amps a ton on 120v. Those numbers seem workable. That'd be $2k for 4 tons of cooling which should come close to doing the job, and would pull about 40 amps which is within the average RV power budget, should be under 5kw I believe.

If the entire unit costs $500 I wonder what just the compressor costs? Half that maybe? So for $1000 and some fittings and such it would be possible to add 4 of those little compressors to the OTR system. They'd run on 120v which is handy and could power the rack and dash air units. Plus they could be staged to adapt to the heat load. Just another way to skin the cat. Three 18000btu compressors might be a better match, 15A ea instead of 10 but maybe only 1 or 2 would be needed most of the time. I suppose either way would work.

Jim

richard5933 · July 05, 2020, 02:26:42 AM

Jim - Have you looked into how the new Freightliner sleeper cabs are set up? They seem to have a system similar to what you're aiming for. The sleeper a/c system runs from the engine a/c compressor when the engine is running, and then when the engine is off it runs on its own DC powered compressor.

From what you're describing, you're trying to build a system similar to theirs, only with multiples of the sleeper cab systems running together.