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tech / sci.electronics.design / Re: Why is an EV's backup power less than it's driving power?

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* Re: Why is an EV's backup power less than it's driving power?Ricky
`- Re: Why is an EV's backup power less than it's driving power?Ricky

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Re: Why is an EV's backup power less than it's driving power?

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Subject: Re: Why is an EV's backup power less than it's driving power?
From: gnuarm.d...@gmail.com (Ricky)
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 by: Ricky - Thu, 17 Nov 2022 16:03 UTC

On Thursday, November 17, 2022 at 4:54:49 AM UTC-5, alan_m wrote:
> On 17/11/2022 09:27, Commander Kinsey wrote:
> > If an EV has an output power of say 80kW to drive the motors when
> > driving, why is the backup power (to power your house in a power outage)
> > only about 10kW? It's the same battery!
> The average usage of electricity per day for a UK household is less than
> 10kWh so a 10kWh backup battery will supply power for a day or more in
> the event of a power cut.

That doesn't necessarily follow. If you run an electric stove, and electric water heater and a heat pump at the same time, you can easily overload a 10 kW power source and still not reach 10 kWh.

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Rick C.

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Re: Why is an EV's backup power less than it's driving power?

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Subject: Re: Why is an EV's backup power less than it's driving power?
From: gnuarm.d...@gmail.com (Ricky)
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 by: Ricky - Sat, 19 Nov 2022 17:26 UTC

On Saturday, November 19, 2022 at 2:16:18 AM UTC-5, Commander Kinsey wrote:
> On Thu, 17 Nov 2022 16:03:44 -0000, Ricky <gnuarm.del...@gmail.com> wrote:
>
> > On Thursday, November 17, 2022 at 4:54:49 AM UTC-5, alan_m wrote:
> >> On 17/11/2022 09:27, Commander Kinsey wrote:
> >> > If an EV has an output power of say 80kW to drive the motors when
> >> > driving, why is the backup power (to power your house in a power outage)
> >> > only about 10kW? It's the same battery!
> >> The average usage of electricity per day for a UK household is less than
> >> 10kWh so a 10kWh backup battery will supply power for a day or more in
> >> the event of a power cut.
> >
> > That doesn't necessarily follow. If you run an electric stove, and electric water heater and a heat pump at the same time, you can easily overload a 10 kW power source and still not reach 10 kWh.
>
> Why would you do that knowing you can only get 10kW at a time? You'd spread the usage out.

I use the stove when I want to cook. The heat pump and water heater run when they need to run. Do I need to not eat until the heat pump and water heater both have just turned off at the same time?

Why are you mixing kW and kWh?

--

Rick C.

-+++- Get 1,000 miles of free Supercharging
-+++- Tesla referral code - https://ts.la/richard11209

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