Dual MV-1050 compressors-will they kill my battery/alternator? - Pirate4x4.Com : 4x4 and Off-Road Forum

Badfish740 · 04-11-2012, 08:30 AM

I have one MV-1050 compressor-got it as a gift from my in-laws and never took it out of the box. I actually thought it would probably die on the first tire fill but then did a little reading online and saw that it's actually a decent little unit and that you can even port them for more airflow. I was thinking of picking up a second one once Pep Boys puts them on sale again and finding a cheap tank and plumbing them all together for a dual unit which I've seen some folks do. With both compressors ported I'm hoping that I'll have a nice little 12VDC 6 CFM 150 psi compressor with a 5 gallon tank for less than $100. The question is with both compressors drawing 30A each can the stock electrical system in my 1991 Yota (22RE) handle it?

***

A little searching told me that Toyota alternators put out 60A (I'm assuming at the upper end of the RPM range) so at idle (unless I rigged up some kind of way to up the engine speed) it could be putting out as little as 30A, maybe even less. However, if I can really get 6-7 CFM out of the compressor, hopefully it wouldn't have to run very long to fill a 5 gallon tank?

steveh · 04-14-2012, 05:46 AM

It depends on your battery with a 60a alt. You need to actully mesure the running current of the compressors to know what they pull.

For example, I have 12v puma comp. It pulls 40amp on start up, and pulls ~30 while running. I run it 100% off the battery to air up all 4. Never an issue, my Battery has the capacity.

So, if you have a good RV grade deep cycle battery, it will charge back up after using the compressors regardless of the load exceeding the alt.

chimaira989 · 04-23-2012, 02:39 PM

A smaller alternator pulley might also help prevent alternator from getting too hot and perform better at lower RPMs. Just have to be mindful of spinning it too far beyond it's limits at the higher RPMS.

chevy_man · 04-25-2012, 07:53 PM

If you're getting the compressors for cheap, why not spend the $ on a higher output alternator? Maybe even one with welding capabilities....

04-11-2012, 08:30 AM	#1 (permalink)
Badfish740 Registered User Join Date: Nov 2011 Member # 204236 Posts: 12	Dual MV-1050 compressors-will they kill my battery/alternator? I have one MV-1050 compressor-got it as a gift from my in-laws and never took it out of the box. I actually thought it would probably die on the first tire fill but then did a little reading online and saw that it's actually a decent little unit and that you can even port them for more airflow. I was thinking of picking up a second one once Pep Boys puts them on sale again and finding a cheap tank and plumbing them all together for a dual unit which I've seen some folks do. With both compressors ported I'm hoping that I'll have a nice little 12VDC 6 CFM 150 psi compressor with a 5 gallon tank for less than $100. The question is with both compressors drawing 30A each can the stock electrical system in my 1991 Yota (22RE) handle it? *** A little searching told me that Toyota alternators put out 60A (I'm assuming at the upper end of the RPM range) so at idle (unless I rigged up some kind of way to up the engine speed) it could be putting out as little as 30A, maybe even less. However, if I can really get 6-7 CFM out of the compressor, hopefully it wouldn't have to run very long to fill a 5 gallon tank? Last edited by Badfish740; 04-11-2012 at 09:09 AM.

04-14-2012, 05:46 AM	#2 (permalink)
steveh Cranky Moderator Join Date: Oct 2000 Member # 2026 Location: Placerville, CA USA Posts: 6,648	It depends on your battery with a 60a alt. You need to actully mesure the running current of the compressors to know what they pull. For example, I have 12v puma comp. It pulls 40amp on start up, and pulls ~30 while running. I run it 100% off the battery to air up all 4. Never an issue, my Battery has the capacity. So, if you have a good RV grade deep cycle battery, it will charge back up after using the compressors regardless of the load exceeding the alt. __________________ 85 Toy Xtracab "I DON'T want to understand !!" Click here to donate to the Rubicon Trail Foundation Rubicon Trail Foundation "Wow this is unbelievable" 2013 Cantina for the 'Con supporters! WIN a fully built Toyota pickup at Cantina 2013 Davez Off Road and Trail Gear are supporting Rubicon Trail Foundation We have returning Platinum sponsors for Cantina 2013 with Raceline Wheels and Falken Tires!!

04-25-2012, 07:53 PM	#4 (permalink)
chevy_man Registered User Join Date: Dec 2007 Member # 104517 Location: MT Posts: 375	If you're getting the compressors for cheap, why not spend the $ on a higher output alternator? Maybe even one with welding capabilities.... __________________ R.I.P. Jason Payne

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04-23-2012, 02:39 PM	#3 (permalink)
chimaira989 Registered User Join Date: Apr 2011 Member # 189427 Location: Augusta, GA Posts: 96	A smaller alternator pulley might also help prevent alternator from getting too hot and perform better at lower RPMs. Just have to be mindful of spinning it too far beyond it's limits at the higher RPMS.