Quote:
Originally Posted by Piotrsko
Not seeing how the boost battery set to 80% is going to do anything until the main battery drops below that value. Not having one of these prius things, I have no history of data gathering, but in the volt pack I have, you don't drop to 80% system voltage till you're gone a fair distance even accelerating up a hill in the winter.
Just did the math, 80% remaining is lower than my recharge point.
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The stock NiMH battery in a 2nd gen Prius will run the car about 1 mile in EV mode. (EV mode was not available as a stock feature in the USA). A 2nd Prius only uses the SOC range between 40% - 80% of the Ni-MH battery. So targeting 80% SOC means the car will be switching to the piggy-back battery about the time it leaves the driveway (assuming the car returned home with the stock hybrid battery fully charged).
The basic premise is to supply power through the stock battery and keep it in the range that EV mode is enabled by the ECU. It isn't a great system and doesn't provide nearly the capability of a factory PHEV like the Volt. It was a way 15 years ago to create a PHEV before any were commercially available.