Getting the full alternator output

[Michael_LI]

I have a 240Amp alternator in my JL. I want to connect large inverter (1500W) so I'll need much of that 240A (min 125A obviously) so I need the full alternator output, not something that's limited to keep the battery happy. So:

1. Does that 240A get delivered directly to the battery cables, and the battery just takes what it wants (e.g. 5-10A) for charging or is there a charge limiting circuit to avoid over-charging? The battery seem the obvious place to connect the inverter to.

1B. If the full 240A isn't available on the battery cable, where would I connect my inverter to?

2. If I connect in that way, does the car increase throttle if I draw more amps, or does the alternator generate full output even at tickover revs ?

n.b. There will be fuses and a relay in-line so that the inverter is only powered when the engine is running to avoid draining the battery.

Thanks,

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[DavidArmen]

Interesting question.

I am almost certain the charging in the wrangler is “smart” and the battery is not just wired directly to the alternator. For example, if I drive a lot in one day, the charging voltage will slowly decrease from 14.1 all the way to the low 13s to prevent overcharging if the lead acid battery is already fully charged. This indicated to me that the battery has some sort of smart charging.

I have no idea if the RPMs automatically increase above idle when there’s a huge load because I’ve never seen that happen with my Jeep, even when using a winch or the arb air compressor.

 

[GSLSE21B]

The alternator always has 240+- available. Add the load and it will deliver when needed

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