Parking Air Conditioning?

[status.six]

They changed the way PHEV emissions are calculated for 25MY cars and part of it was to encourage PHEV to be actually charged via an external power supply (and not the engine) , so most of not all manufacturers removed the facility to run the engine to charge the battery. The reason for the calculation change was that real world data showed that large proportions of PHEVs rarely got charged yet attracted tax breaks associated with their theoretical emissions.

Funnily enough my mate, who has free fuel from work, always ran his hybrid cars on petrol and never charged from the mains. He was getting like 22MPG hauling round a mostly empty battery pack the whole time!

 

[omelius]

If you’re only looking to buy a PHEV for tax benefits or incentives, you might end up relying solely on petrol and neglecting to charge the battery. In that scenario, the car essentially operates as a traditional hybrid, hauling around a heavy, mostly empty battery pack, which reduces overall efficiency—as evident from the 22MPG your mate was getting.

What’s worse is the issue with charging the PHEV battery indirectly via a plug from leisure battery. This introduces double charging loss: first, energy is lost during the conversion when charging the leisure battery, and second, more energy is lost when transferring from the leisure battery to the PHEV battery. Moreover, since new PHEVs do not allow direct charging from external sources other than mains, this inability applies the double-charging process in such cases, making it even less efficient and more impractical. Ultimately, relying on such a setup is far from ideal and only worsens the overall inefficiency of using a PHEV without charging it properly.