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[Pat Conlon]

No worries today, I also carry a battery jumper pack. It's also great for re-charging my cell and Sena.
This little dude is powerful. It jump started my wife's GMC Yukon 5.3L 4x4.

Excellent tip, Pat. I bought one of these from RPM last year, and I used it 4 times on a recent trip (I knew I had a weak battery when I left). Never would have occurred to me that I could run my portable compressor off it, too.

I'm not sure about running the compressor off the battery pack. (I don't have a compressor yet)
 Although, it will certainly jump start my bike if I run the FJ battery down when using a compressor.

I'm curious, has anyone tried running a compressor off a jump pack?

[racerrad8]

I'm curious, has anyone tried running a compressor off a jump pack?

I have been told the #1 reason battery packs go bad is they are not designed for continuous voltage output. They are not designed to run an engine with out a battery or I would presume run the compressor.

I had a couple of units I sent back over the past couple of years and both claims were denied because they said the unit was used as a constant output battery source.

They are "jumper" batteries and not for constant voltage supply for significant consumption. Yes, you can use them to charge milliampere devices like your phone or Sena, but not to run high ampere demand things like a motorcycle or car electrical system.

Randy - RPM

[Pat Conlon]

Yep, I thought so, thanks Randy!

[Tuned forks]

Just curious but why wouldn't you run the engine, and thus the charging system, while powering a compressor off the battery?  I'm not knowledgeable about how long it takes to overheat a FJ engine at idle.
Joe

[ZOA NOM]

Just curious but why wouldn't you run the engine, and thus the charging system, while powering a compressor off the battery?  I'm not knowledgeable about how long it takes to overheat a FJ engine at idle.
Joe

I would definitely run the engine while running the pump. The five or so minutes it would take to inflate a tire wouldn't be a heat issue unless you were stuck on a very hot day. Even then, I doubt it would be an issue.

[Pat Conlon]

I don't know Joe.
How long does it take the new compressors to inflate a 180/55-17 rear tire?
Like Rick said, hot summer day, heat soaked engine, how long should I idle my 1380?

[Bones]

Just curious but why wouldn't you run the engine, and thus the charging system, while powering a compressor off the battery?  I'm not knowledgeable about how long it takes to overheat a FJ engine at idle.
Joe

At idle the alternator wouldn't be charging the battery anyway, you'd need at least 1500rpm upwards to start charging, at least mine does.

[Tuned forks]

I saw Randy using a voltmeter on Ryan's bike a week ago.  I suppose that's something I should do as well.  Not only to check charging voltage but it's a good idea to know at what rpm the alternator starts charging at.

Joe