Does the Powerboost charge the 12V battery when in electric mode?

[PatchManager]

Is the 12 volt battery charged when the Powerboost is in electric mode?

Also, is the AC compressor in the Powerboost electric?

By the way, I had my truck sitting for almost 3 weeks and the 12 volt battery still had a good charge.

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[tbinmd]

Yes, battery is charged when in electric mode. AC is electric, best feature of the powerboost in my book, when working in the truck during the summer.

 

[Porpoise Hork]

The Ford BMS (battery management system) continually monitors the state of charge on the 12v side. If the truck is powered down and the 12v SOC starts declining the truck will shut down non-essential modules entering deep sleep to reduce parasitic draw on the battery to prevent it from going dead. When in generator mode the system operates the same as it would when in normal driving and will provide charging power back to the 12v system to maintain the battery SOC as set in the system (80% by default). All though frequent short trips will not give the system ample time to bring the battery SOC back up if low since the 12v alternator is the primary source for maintaining the 12v system.

This may be different on the 24+ refresh where they have removed the belt driven starter/alternator and handed ICE starting and all DC power generation over to the main electric drive motor.

As for what all is electric on the PB. Like @tbinmd stated the HVAC system is all electric. This is to maintain not only cooling for the passenger cabin but also the hybrid control system under the hood. The brakes also have an electric motor instead of the traditional ICE powered vacuum assist system. Both of these are pretty much standard for full, plug-in hybrids and full electric vehichles.

 

[Samson16]

since the 12v alternator is the primary source for maintaining the 12v system.

Have you measured current flow from the BISG to the 12V bus? That would be new I believe.

 

[Hans Moleman]

Can someone let me know if all of this is correct?

1. The motor inside the transmission charges the HV battery either via regenerative braking or engine power.

2. The BISG charges the 12V battery.

3. The HV battery charges the 12V battery as well via AC to DC converter.

 

[Oxford_Powerboost]

Can someone let me know if all of this is correct?

1. The motor inside the transmission charges the HV battery either via regenerative braking or engine power.

2. The BISG charges the 12V battery.

3. The HV battery charges the 12V battery as well via AC to DC converter.

1. Yes

2. no, it’s a high voltage generator and would be used to charge the HV battery pack or spin up the engine. The 12V battery is charged from the high voltage battery via a step down converter that brings the voltage from ~280 down to 12V

3. yes, but this is the only way the 12V charges

 

[Snakebitten]

I'm kinda hoping since Ford removed the BISg from the Powerboost, we can put to rest that it was not deployed as a generator at all.

It COULD be, but Ford didn't need that feature. And for it to be a generator, it would require additional "control wiring" that doesn't exist. Nor are any of the thousands of PIDs that Ford equipped the truck with, that I have found, monitor or report the BISG activity as a generator.

I really really looked hard to find evidence.
Totally prepared to eat crow though.

 

[Gros Ventre]

I'm kinda hoping since Ford removed the BISg from the Powerboost, we can put to rest that it was not deployed as a generator at all.

It COULD be, but Ford didn't need that feature. And for it to be a generator, it would require additional "control wiring" that doesn't exist. Nor are any of the thousands of PIDs that Ford equipped the truck with, that I have found, monitor or report the BISG activity as a generator.

I really really looked hard to find evidence.
Totally prepared to eat crow though.

The wiring that provides the excitation when the BISG is motoring would also provide the excitation to drive it as a generator, No additional "Control wiring" needed. You're focused on PIDs. Tell me what electric circuits power the BISG as a motor? When I know that I can tell you if they use it as a generator also. For example, if the excitation is driven by the central computer system, then the computer simply raises the excitation to the BISG. If my experience on an Escape Hybrid is similar, then the DC-DC converter sets system voltage. But then if it is programmed to, it can control the BISG excitation. For example: if the BISG is on but neutrally energized, lower the excitation to it and it motors, starting the engine. With the rise in rpm as the engine comes on line it can then start generating without further change. EG the output is determined by the combination of BISG rpm and excitation. So it can go from motoring at a low rpm to generating at a higher rpm with out changing the excitation level.

 

[Snakebitten]

OK, never mind.
It will never be put to rest.

Even though the 2024 F150 doesn't even have one any longer and the ONLY documentation we have from Ford is them discussing as a method to start the ICE and they no longer need it to "start the engine", therefore they removed it.

Not to mention that the DC/DC converter IS DOCUMENTED thoroughly, as well as supported by PIDs, in its role to provide 12V current from the HV battery, as well as charge both AGM batteries onboard.

Plenty of evidence that the BISG is only a starter.
Zero evidence that it was needed, used, or deployed as a generator.

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