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Author Topic: Inverter  (Read 4500 times)
Beesme
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« on: September 01, 2014, 12:48:18 PM »

Just installed a 3000 watt inverter with 2 ,31 batteries .Do any of you know if mounting inverter on ceiling of luggage compartment upside down will effect life of unit ? I left plenty of room for air flow. I didn't read where it mattered how it was mounted , it's not like there are moving parts . H,mmmm idk
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« Reply #1 on: September 01, 2014, 01:18:42 PM »

I don't know the answer to your specific question but I would have the same concern - the 'peace of mind' solution would be to simply mount the invert upright on a suspended shelf hung from the ceiling.

Jeremy
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« Reply #2 on: September 01, 2014, 02:32:13 PM »

I too had the same question and could not find a factory rep or repair technician who could answer my concerns. So, I made a suspended cage and problem solved. I now have the unit projected from accidental damage as well.

Grant
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Sean
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« Reply #3 on: September 01, 2014, 03:29:34 PM »

Make? Model?

I have never seen an inverter, UL-listed for RV use, that did not specify mounting details in the installation instructions.  But without knowing what you have, it's impossible to answer your question accurately.

That said, in general, inverters need airflow when they are operating, from convection or otherwise, and thus mounting them to a compartment ceiling is contraindicated.

-Sean
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« Reply #4 on: September 01, 2014, 03:37:16 PM »

There should be no problem mounting it upside down Wink
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« Reply #5 on: September 01, 2014, 04:06:46 PM »

As long as you drive in Australia you are fine mounting it upside down. 

Seriously though, I can't see anything in an inverter that would have any issue being mounted upside down. 

Vern
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Vern in Central Florida
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« Reply #6 on: September 01, 2014, 05:37:59 PM »

Hmm, well for one thing heat rises...so if the cooling vents are now at the bottom how's the hot air going to get out of the case? (On both my inverters, though, the vents are at the ends of the case with fans to pull the air through)

Although I personally wouldn't go quite as far as Sean in suggesting that the manufacturer is likely to have planned a convection flow throughout the whole compartment as part of the cooling arrangements for the inverter, for the sake of a little bit more work I'd certainly make the effort to mount the thing upright at least - and maybe even install a fan and/or cut some holes in the ceiling above the inverter if you judge that it's going to end-up sitting in a stagnant pocket of hot air of it's own making

Jeremy
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« Reply #7 on: September 01, 2014, 05:45:03 PM »

If the components are heating up that much, ambient venting isn't going to do jack for them.  If heat is an issue it would have a fan build in already. 
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Vern in Central Florida
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« Reply #8 on: September 01, 2014, 06:20:20 PM »

If the components are heating up that much, ambient venting isn't going to do jack for them.  If heat is an issue it would have a fan build in already. 

some do....have a fan iirc
but i have seen a few that were mounted vertically on a wall....
and living once, in a flood plain, pre hurricane IKE, I considered mounting mine on a bay ceiling...
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« Reply #9 on: September 01, 2014, 06:29:33 PM »

I wouldn't hesitate to mount an inverter or charger upside down.
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« Reply #10 on: September 01, 2014, 06:43:41 PM »

Magnum says on my 4024 Hybrid has 2 fans. Don't think at 194 degrees F against 3/4 inch plywood would be very good with no air flow between it and the ply?
Dave5Cs


The inverter base can reach a temperature up to 90C (194F) and should be mounted on a
noncombustible surface*. This surface and the mounting hardware must also be capable of
supporting at least twice the weight of the inverter. To meet regulatory requirements, the MSH-M
Series must be mounted in one of the following positions (as shown in Figure 2-2):
above or under a horizontal surface (shelf or table),
on a vertical surface (wall) with the DC terminals to the right,
on a vertical surface (wall) with the DC terminals toward the bottom
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« Reply #11 on: September 01, 2014, 09:45:56 PM »

3000 watt inverter with 2-31 batteries? You'll find out very quickly, that those batteries are not enough. Depending on what you're running, you should be at least at 500amp/hrs (like 2-8D's). Good Luck, TomC
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« Reply #12 on: September 02, 2014, 03:57:46 AM »

What make and model of inverter?

Brian
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Beesme
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« Reply #13 on: September 02, 2014, 02:08:24 PM »

It's an n-verter brand from northern the batteries are deep cell marine batteries there is a 3/4 " of air space between ceiling and base . 24 hrs it reads 87deg with ir gun with an apt size frige I still have 106volts after 24 hrs the batts are tied in with my 8d batts so I m thinking between the 4 batteries it should last long enough . Oh and the bus started! I also have a 12 kW kubota generator if I did drain my batteries and that has its own battery also. I think I'm good . But it is only a start thanks for all the answers keep bussin ! Now onto solar haha omg ! I'm thinking at least 500watts for a start ! I'm just a dumb electrician haha she's gonna be a power station ! Jk see ya
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Bruce E.                                                                        62 pd4106 vs730.                   
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« Reply #14 on: September 02, 2014, 03:05:12 PM »

so really you have something like this ?

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Donald PH
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« Reply #15 on: September 02, 2014, 03:09:18 PM »

As Tom said, you'll need (a lot) more batteries to power a 3kW inverter!   3kW at a nominal 12V is a whopping 250A  -  that's almost at starter motor current levels!   The generally-accepted wisdom on the Northern Arizona Wind & Sun solar forum is that drawing more than about 100A from 12V batteries will run you into Mr.Peukert and his limitations on battery currents, unless you have a battery bank a lot larger than your two Group 31s.

To put this into perspective, I have 2kW of solar panels that will charge eight golfcart and/or L16 batteries through two Morningstar TS-MPPT-60 charge controllers.   Even with a minimum of 900Ah from eight GC-2s (or more if I use L16s), I don't plan on having a TSW inverter larger than 1500W for general AC loads.   I will also use 4/0 cables from each bank of four batteries to their isolator and from the two isolators to the main DC load center  -  for a 3kW inverter running off 12V I would suggest paired 4/0 cables to minimize voltage loss.

Back to the original question.   Assuming your inverter is about 90% efficient, you could be dissipating up to 300W of heat from it at full load!   That needs some serious thought about airflow and heatsink orientation.   For that much potential heat production I would mount the inverter on perforated 1/4" aluminum sheet  -  definitely no wood anywhere near it!

John
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Beesme
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« Reply #16 on: September 02, 2014, 03:17:15 PM »

If I were to use 3 k yes I agree. I just got a good price on it . The only power that will be going through it is a refrig that most of the time is only at a couple hundred watts even start up is only around 1 k and that is at start up. I don't know very many peeps using  3 k unless you were using ac I guess . This is for keeping beer and food cold . Nothing but fridg and 2 lights tied in.
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Bruce E.                                                                        62 pd4106 vs730.                   
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« Reply #17 on: September 03, 2014, 10:48:55 PM »

Idle current is significant in any low cost new inverter. You might be able to get the specs from the maker.

Good luck.

Tom Caffrey
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Beesme
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« Reply #18 on: September 04, 2014, 01:15:11 PM »

I am designing a cradle so inverter can suspend from ceiling upright . But just for info I have been monitoring temps of mounts and staying at 87deg. But for safety reasons I will move . Thanx for all the input.
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Bruce E.                                                                        62 pd4106 vs730.                   
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« Reply #19 on: September 04, 2014, 01:24:49 PM »

Sorry eagle 19952 . Yes inverter is something like that .
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Bruce E.                                                                        62 pd4106 vs730.                   
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« Reply #20 on: September 04, 2014, 01:27:27 PM »

So you don't want your inverter to be inverted?   Tongue
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Vern in Central Florida
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« Reply #21 on: September 05, 2014, 03:55:46 PM »

Lol mung no I guess not inverted haha omg made me chuckle!
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