Re: Toyota Highlander Hybrid (2006), battery power from 288 V to 12 V battery

Bruce L. Bergman <blnospambergman@earthlink.invalid> wrote:[color=blue]
>
> They 12V battery's main job is to run the dome lights and burglar
> alarm, and to boot up the car computer. The computer closes the 288V
> contactor, and the Hybrid System inverter spins the engine to start
> with the 288V Alternator/Starter coupled to the engine.[/color]

Aha, no wonder the charge on the 288V battery pack can't fall below 3/8.
[color=blue][color=green]
>> Also what's the point of using a deep cycle battery in this application?[/color]
>
> They should use Deep Cycle batteries more often - cars have 10ma to
> 50ma parasitic draws for the computer and radio memories and the
> clock, and if you have a burglar alarm add another 50 to 100 ma for
> the LED and the sensors. Don't drive the car for over a week, and
> that little draw starts to add up fast.[/color]

I see what you mean! A hybrid-synergy vehicle could be parked
(e.g. airport long-term parking) a lot longer with a Deep Cycle battery
than otherwise. The only downside is that Deep Cycle lead-acid batteries
are heavier than regular lead-acid batteries, and much heavier than NiMH.

On 5 Jan 2007 10:23:29 -0800, Bill Tuthill <ccreekin@yahoo.com> wrote:
[color=blue]
>Bruce L. Bergman <blnospambergman@earthlink.invalid> wrote:[color=green]
>>
>> They 12V battery's main job is to run the dome lights and burglar
>> alarm, and to boot up the car computer. The computer closes the 288V
>> contactor, and the Hybrid System inverter spins the engine to start
>> with the 288V Alternator/Starter coupled to the engine.[/color]
>
>Aha, no wonder the charge on the 288V battery pack can't fall below 3/8.
>[color=green][color=darkred]
>>> Also what's the point of using a deep cycle battery in this application?[/color]
>>
>> They should use Deep Cycle batteries more often - cars have 10ma to
>> 50ma parasitic draws for the computer and radio memories and the
>> clock, and if you have a burglar alarm add another 50 to 100 ma for
>> the LED and the sensors. Don't drive the car for over a week, and
>> that little draw starts to add up fast.[/color]
>
>I see what you mean! A hybrid-synergy vehicle could be parked
>(e.g. airport long-term parking) a lot longer with a Deep Cycle battery
>than otherwise. The only downside is that Deep Cycle lead-acid batteries
>are heavier than regular lead-acid batteries, and much heavier than NiMH.[/color]

Yes, but you need that density in the plates to get the deep-cycling
ability without lead wool shedding on a conventional wet D-C battery.

And the heavier plate web sections on an Optima to deliver the
massive Cold Cranking Amps.

Toyota was shaving every excess ounce of weight off the car they
could find, to get every hundredth of a MPG they could across the
entire fleet - make a million cars, and every hundredth counts. Ergo,
they used that Garden Tractor sized U1 battery in the car.

Hell, my burglar alarm system has a bigger battery... ;-)

You, the end user, can easily sacrifice a few hundredths of a MPG on
your one car carrying a slightly larger and heavier battery, to get a
much more reliable battery system.

--<< Bruce >>--