Electricity usage (off-topic)

[Stephen Partington]

So solar usually pairs best with some level of power storage. and amazon
has some amazing options going right now for far less than what you are
getting quoted.

Just the fast search comes up with this kit for a ton less than you are
getting quoted.
Bear in mind you will have to add in the cost of connecting it to your
panel, but still an interesting baseline.

On Wed, Nov 27, 2024 at 12:41 PM George Toft via PLUG-discuss <
plug-discuss at lists.phxlinux.org> wrote:

> A friend was looking into solar with a Tesla wall (battery). I looked at
> her APS bill - it was $120/month. They were seriously considering
> spending $25K to cut down on the peak demand charge. The most they would
> save was $20/month. That's an ROI that would never be achieved.
>
> I have solar. APS invited me to buy a battery and they would pay me
> $1250 if I let them manage it. The battery was quoted at $15K. Yeah, no.
> So let's say I use the battery to keep my 4pm-7pm APS draw minimized,
> what is my ROI? Looking at my past bills, my peak demand charge ranges
> from $5 to $121 per month. Let's average that out to $65/month. So $15K
> to save $65/month gives me an ROI of 230 months. It will be less due to
> APS price increases, but that's still 15-20 years out, and by then the
> battery would need to be replaced, nullifying any notion of an ROI.
>
> Regards,
>
> George Toft
>
> On 11/26/2024 3:31 PM, Keith Smith via PLUG-discuss wrote:
> > Hi,
> >
> > I have been curious about solar for sometime.
> >
> > I am looking at my electric bill and I use less than 600k watts a
> > month for 1/2 the year.
> >
> > My math does not seem to work out.
> >
> > 1) Convert 600000 watts at 120 volts * .1 = 60,000 watts at 12 volts.
> > 2) 60,000 watts divided by 30 = 2000 watts at 12 volts per day.
> > 3) If I can harvest solar for 4 hours a day that is 2000/4 = 500 watts
> > at 12 volts.
> >
> > That means I only need 500 watts of solar.  This does not take into
> > consideration loss of power in the system.
> >
> > If the system losses 30% then I need around 715 watts of solar panels
> > to meet my needs.
> >
> > I was expecting a lot more.
> >
> > Any help is much appreciated!!
> >
> > Keith
> >
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-- 
A mouse trap, placed on top of your alarm clock, will prevent you from
rolling over and going back to sleep after you hit the snooze button.

Stephen
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