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Fun Facts - 85kWh

Looking at this thread on regen I got to thinking about just how much energy is in an 85kWh battery. So, plugging it into Wolfram alpha we find out that 85kWh is:

  • equivalent to 305MJ
  • about $9.83 in typical electricity prices
  • 10% of the annual energy use of a standard clothes dryer
  • 16% of the Planck Energy
  • 20% of the energy of a typical (?) lightning bolt!
  • 3.6% of the total magnetic field energy in all the magnets in the LHC
  • 3.4µg relativistic mass equivalent

Any other interesting/fun/crazy equivalencies?

The glass on the panels is tougher than many might fear, but large hail is something to consider. We do occasionally get hail, but only once in the 15 years I've been here and it was far too small to cause any damage.

I had a pipe leak and my insurance covered 10k in damages. My rates did not increase at all.

MB3 -- it is possible for the home owner to take nearly all that margin for themselves.

Renters and hi-rise dwellers are SOL, however.

True that. I don't know what they can do. Would it be possible for local high concentrations of S owners to pool their resources and build a nearby charging/parking station? Probably not, but just a thought.

I had a rather interesting encounter with a solar lease vendor who came to my door a few months back (not Solar City - I don't recall the name). Normally, my answer for any door-to-door salesman is "no thanks", but I made an exception and I had him arrange a follow-up call after telling him I was considering getting a Tesla (which he hadn't heard of).

The provider arranged for a three way call with PG&E to get more information about what my rates would be like, and then told me that with the discounted rates offered by PG&E and my current energy consumption, it wouldn't be worthwhile. That is, the amount of electricity I'd consume and the discounted rate that PG&E offered in comparison meant that I wouldn't be saving money by going with them. I also took it to mean that if they tried to meet PG&E's rates, they would get too small a check from me and from PG&E for the feed-in tariff to make it worth their investment of installing a solar system.

According to a calculator on PG&E's website, I also found that if I switch from my current flat rate (that is, no difference whether my usage is at day or night) to the time-of-use rate schedule for EV owners, I'd actually pay less. That was even factoring in the cost of electricity for the amount of miles I drive a day on a Roadster (the Model S isn't listed yet). If anyone else is interested, you can try the calculator out here:

The break-even point on the E-9A schedule (one meter) seems to be 23 miles a day. There's a second rate plan, E-9B, in which PG&E installs a second meter for use specifically with the EV. There are additional charges for the meter, but a different rate schedule, and according to the calculator, you it catches up to the E-9A schedule at 43 miles a day (a combined 43 miles, if you have two or more EVs, I believe).

@MB3 - regarding hi-rise dwellers, in California there is a law that requires HOAs to grant a condo owners request to support EV charging, mentioned here:

This doesn't mean it will be solar, of course. Perhaps something like a community garden project would make sense - take an open lot or public space like a park or parking lot, and arrange for a PV system to be built. The proceeds would in part at least go toward offsetting the electric bills of participants. While it might not be on the same bill, it'd still be a way to get solar installed and the usage of the EVs offset.

A building (but probably not individual units) could choose something like PG&E's "Green Option" in which PG&E buys green energy certificates equal to the percentage of your bill that is not already green. That is, your electricity comes from the pool of available electricity, but you pay extra to offset the part that comes from fossil fuels. It doesn't simply take a slice of the solar power out of the pot and assign it to you, but I don't know how the certificates are used - presumably, PG&E buys them and the funds go toward solar and wind farms, etc., as opposed to merely going toward PG&E buying from those sources (which they're mandated to do anyway by the state).

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