Battery Charge Stacking while Parked

i'll admit, you're over my head now.

 

It essentially all gets converted to heat, both through combustion and through engine friction. Less fuel is burned than when under load, and it all goes into heat and waste products (pollution).

 

okay, so producing electricity would use more petrol?

 

Generally, yes. Some of the otherwise lost heat does work instead when generating, but not all of it by any means.

 

does it take much generating to keep the battery from losing charge just running the electronics and heater fan while idling?

 

In EV mode, if you sit in the car, your EV range will drop too. There is an overhead to keep the car in Ready state.

 

now that, i've seen. but it's not much because there's no point to having the fan or headlites on.

 

Just imagine ICE running in isolation to produce heat, not consuming nor producing electricity.

EV mile estimate can drop. That's Mark's scenario.

CaliforniaBear's scenario is where ICE burns more gas to produce 3-5 hp to charge the battery.

 

but you can't can't control it. it's all based on soc?

 

That's the current theory in EV mode based on the fact that it is basically the charge depletion mode. The car's priority is to use up the battery charge, so charging is a no-no, especially at high SOC. There may be other parameters.

In HV mode, the charge is sustained by discharge-charge cycle like a regular Prius.

 

o/p said everytime he switched modes, it started charging, then stopped.

 

Right, charging stopped but not necessarily ICE stopped.

I think what happened come down to ICE running to bring up coolant to 130 deg F (target before shutting down). In effect, raising SOC by 5%.

When it stopped charging in HV mode, it was slowly topping off (idle) to reach 130 deg F. OP switched to EV and back to HV. Charging resumed a bit but then the car realized the temp reached so it shut down.

If OP left it in EV mode, coolant temp should raise slower (Heat in idle) and SOC could drop.

 

thank you!

 

I agree, well said by USB on all that. You should teach a Prius class at NYU.