We've had charge system faults on here. May be a knackered DC/DC converter if I remember correctly. Yeah, we know that some have had a duff 12v battery. It's still about adapting your driving style, regen'ing as much as you can to get energy into both batteries.
I should be OK then, in theory, coz I coast a lot....
Ford Puma ST-Line Vignale 155 Automatic.
Driver Assistance Pack. Power Tailgate etc. etc....Frozen White.
Wireless Android Auto.
Previous Puma ST-Line X First Edition.
Wdf76 wrote: ↑Wed Apr 14, 2021 7:14 pm
If you're not charging the 48v battery you're not charging the 12v battery..... It's all in the regen.
Sounds good, but it's not true The 12 volt battery is always being charged whilst the engine is running. During regenerative breaking, accelerating, idling. It is even charged during start/stop in traffic. Only when you switch off the car does the 12 volt battery stop being charged.
Pumanic wrote: ↑Wed Apr 14, 2021 8:08 pm
The dealer were very clear that sitting with the clutch in doesn't charge the battery. Bit then everything else they told me was wrong...
Dealer is wrong. Both batteries can still be charged with clutch pressed. 12 volt battery is always charged whilst engine is running irrespective of clutch position!
Wdf76 wrote: ↑Wed Apr 14, 2021 7:14 pm
If you're not charging the 48v battery you're not charging the 12v battery..... It's all in the regen.
Sounds good, but it's not true The 12 volt battery is always being charged whilst the engine is running. During regenerative breaking, accelerating, idling. It is even charged during start/stop in traffic. Only when you switch off the car does the 12 volt battery stop being charged.
The DC/DC converter is always converting 48 to 12 volt power. During acceleration (generator acting as a motor) the 48 volt battery powers both the motor and DC/DC converter and the 48 volt battery will be depleted. Lift off the accelerator pedal and the generator switches back to being a generator, now charging the 48 volt battery.
The 12 volt battery is always being charged whilst the engine is running. During regenerative breaking, accelerating, idling. It is even charged during start/stop in traffic. Only when you switch off the car does the 12 volt battery stop being charged.
