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Old 03-07-2018, 03:41 PM   #17 (permalink)
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Gen2 Prius - '08 Toyota Prius
90 day: 98.01 mpg (US)
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[QUOTE=S Keith;562959]Great way to cause cycle wear with no benefit. Usable capacity of the Prius NiMH pack is almost identical to the total capacity of the 12V, so conceptually, you're trying to gain some benefit by adding additional energy equivalent to the capacity of your 12V battery.

The good thing is that your battery will probably be very balanced most of the time.

The bad thing is that your battery will sustain accelerated cycle wear due to you forcing the battery to 100% SoC. This increases the depth of discharge and adds battery cycles where there otherwise wouldn't be any. This generally equates to reduced battery life.

Hi S Keith,
You are replying to someone elses passing comment/reply on this thread.

What happens with the Plug-in Supply(PIS) system is that it actually reduces the number of cycles on the main pack. The PIS system keeps the main pack at around 62% SoC, which is the optimum for cell life (set by Toyota). This is just one of the many smarts of the PIS system (unfortunately - no longer available - see notice below).

Last edited by evric; 03-24-2018 at 10:02 AM..
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