Yet more 48v questions

[Foxtrot]

Greetings!

So a conventional vehicle has an alternator to keep things happy, but the 2.0 swaps this out with the BSG and the 48V system. Now that it has been out for awhile, are there any issues or concerns with powering extras? Winch, fridge, extra lighting, trailer, etc. Can the 48v-12v converter handle the load?

Follow on, I have run dual batteries in the past to give me some built in power for running stuff with the engine off, such as the aforementioned fridge and some campsite lighting, among other things. Are there any potential issues using a kit such as the Genesis?

Lastly, if 48v becomes commonplace and we start seeing 48v accessories, does our system lend itself well to being expanded?

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[emoody007]

As far as I can tell the 48v battery only operates the BSG. The BSG basically turns the engine over from a dead stop like an electric or hybrid car when the auto start/stop is in use. Then the BSG acts as an alternator for the 12v battery. The 48v battery gets recharged from braking. the 48v is it's own separate system that doesn't do anything but activate the BSG. As far as the 12v is concerned I've seen when disconnecting the battery there is still voltage showing on some of the wiring because of a secondary battery underneath the fuses somewhere which indicates to me that you should be able to start the Jeep with a dead battery but don't quote me on that. It would be nice to have an emergency dead battery start from the BSG when the 12v is dead... Basically a 48v electric roll start then the BSG will start feeding power to the 12v system.

 

[emoody007]

Here's a better explanation

 

[WXman]

You're being wise to do research before adding accessories. An alternator can be bought for $200. But a MGU unit for that 2.0L has a list price of $1,225. And that's not including the 48v battery pack and associated wiring/relays/lugs if you end up frying something in the system.

 

[FUHL]

As far as I can tell the 48v battery only operates the BSG. The BSG basically turns the engine over from a dead stop like an electric or hybrid car when the auto start/stop is in use. Then the BSG acts as an alternator for the 12v battery. The 48v battery gets recharged from braking. the 48v is it's own separate system that doesn't do anything but activate the BSG. As far as the 12v is concerned I've seen when disconnecting the battery there is still voltage showing on some of the wiring because of a secondary battery underneath the fuses somewhere which indicates to me that you should be able to start the Jeep with a dead battery but don't quote me on that. It would be nice to have an emergency dead battery start from the BSG when the 12v is dead... Basically a 48v electric roll start then the BSG will start feeding power to the 12v system.

Not quite.
There is no extra battery under the fuseblock like the V6.
The 48v will keep the 12v battery at 14.4 volts when the start/stop is on (engine not running but ignition is on) like at a stop light. I am not sure if the 48v battery feeds the 12v when the ignition is in accessory.

 

[FUHL]

The BSG keeps the 48v battery charged. The 48v battery keeps the 12v battery charged.

 

[emoody007]

Not quite.
There is no extra battery under the fuseblock like the V6.
The 48v will keep the 12v battery at 14.4 volts when the start/stop is on (engine not running but ignition is on) like at a stop light.

I knew I saw where there was an extra battery somewhere but that's for the V6, Gotcha.
So based on your second statement... If the 12v was to go dead, then the 48v should convert 14.4 over to the 12v system for a start if needed? Or is it just to help prevent power drainage for the 12v electrical in lieu of the no engine running and providing electrical power?

I make my statements on my basic understanding of the system but always leave the door open for corrections.

 

[FUHL]

I knew I saw where there was an extra battery somewhere but that's for the V6, Gotcha.
So based on your second statement... If the 12v was to go dead, then the 48v should convert 14.4 over to the 12v system for a start if needed? Or is it just to help prevent power drainage for the 12v electrical in lieu of the no engine running and providing electrical power?

I make my statements on my basic understanding of the system but always leave the door open for corrections.

I added to my post when you where replying.
I think if you turn the ignition on, the 48v will send 14.4v to the 12v. So if that is the case, if the 12v is dead it should start due to the 48v feeding it 14.4v.

 

[Foxtrot]

I like this discussion!

Anyone want to install a dead battery or drain their 12v battery to test this theory? I'm intrigued.

Also as far as I can tell, I'm finding no reference to a 48v gauge or even a charge indicator for the 48v battery, does this check out from everyone's experience? I wonder if SuperChips can add it to the traildash2 or something similar (maybe even a boost gauge for S's and G's, I'm sure the ECU has these datapoints), I doubt the Tazer would be able to add this due to the nature of the change, but I don't see any reason the traildash can't.

I still have 8-10 months till I can take delivery, so I'm trying to plan all I can till then. My Musso sucks...

 

[Foxtrot]

The BSG keeps the 48v battery charged. The 48v battery keeps the 12v battery charged.

Any idea how many amps the PPU can output on the 12v side?

 

[FUHL]

Any idea how many amps the PPU can output on the 12v side?

No clue.

 

[Budagreg]

Any idea how many amps the PPU can output on the 12v side?

With the trailer towing group you get a 240 Amp Alternator and 700 amp battery.

 

[FUHL]

With the trailer towing group you get a 240 Amp Alternator and 700 amp battery.

No.
The alternator is deleted with the 2.0L. Not sure about the battery.

 

[Budagreg]

No.
The alternator is deleted with the 2.0L. Not sure about the battery.

I stand corrected. the Jeep build site does not delete the 240 amp Alternator (tow group) when you have the 2.0 turbo.
I did verify the 700 amp battery.
I for one love my turbo! Walked away from a JK Rubicon, no problem...

 

[FUHL]

I stand corrected. the Jeep build site does not delete the 240 amp Alternator (tow group) when you have the 2.0 turbo.
I did verify the 700 amp battery.
I for one love my turbo! Walked away from a JK Rubicon, no problem...

This is a screenshot of the details for the 2.0L for 2018 model year. Shows alternator delete and 700 amp battery. For 2019 there is no "Includes" list shown.

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