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Old 05-22-16, 11:42 AM   #11
NiHaoMike
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Originally Posted by Servicetech View Post
There are 29.3KWH in a therm of gas. 29.3 x.11 cents per KWH (do you stay under 600KWH most months?, most people don’t) = $3.22 Gas is 44 cents, you need a COP of 3.22/.44 = 7.3 for the HPWH to make sense. Most tank water heaters get about 78% THERMAL efficiency, which means you need a net COP of 5.85 to make sense.

Odds are the bosch tankless is NOT modulating, which makes temp control difficult. Fine for a cabin or a single person, but it ain’t gonna fly if you have a family.

Sad to say, but the plain boring NG tank is probably your best option. Natural gas is cheap, it doesn't cost THAT much to heat water to begin with...
Also consider natural gas service charges. It can be high enough to offset the savings. That would be unlikely up north, but pretty likely down in regions with low heating demands.

Flipping the question around, would it make sense to use CHP? The generator would only need to be better than 13.7% efficient to break even on electricity alone, pretty easy to do. Up north, the heat would be put to good use for a large part of the year, meaning it makes even more sense.

Should be a good place to DIY a generator out of a small car engine and an industrial induction motor.

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Old 05-22-16, 05:56 PM   #12
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Originally Posted by Elcam84 View Post
They already do time of use in some parts of the country. Some are optional like up north you can have your AC on a seperate meter and they charge you a lower rate but they have the capability to turn off the meter when demand is high. I have friends and relatives that have done theirs and they have never shut the power off to them at peak load.

Some do have a true peak hours electricity fee rate.

Then there are places like here where we were deregulated and prices skyrocketed. Now we have lots of so called providers but there are only about 3 real producers with txu being the main one. (They split txu into two companies one delivery one production at the time of deregulation)
Some of the providers are offering plans with free night and weekends electricity. The catch is you are still paying all the taxes and delivery fees on that electricity so it isn't really free.
It's their way to start edging into peak rate fees.


As for the free appliances. Yeah it isn't a big amount of $ for the Elec companies and it's probably a write off anyway but it still wreaks. Not to mention those frigginair refrigerators are not the best on the market and usually have a short service life. Lots of compressor failures and their electronic defrost boards are a high failure item that run around $80 for the board and new wiring harness.
You may save $ on electricity with that new fridge but you will end up shelling out the savings in repairs (common for stuff these days)

And as for reducing the need for generation plants that is needed in many places however in tx it isn't an issue. A few years ago they started shutting down electric plants due to having way too much generation capacity. These were mainly natural gas plants, only a couple coal plants in south tx) Some were totally decommissioned but many of them are pickled so they can fire them up when the demand is there.
Even with the vast population explosion there isn't a need for more generation, yet anyway...
People in the USA have it pretty good atm , Over here in Australia we're paying a minimum of $0.17/kw off peak (11pm to 7am) $0.23/kw standard rate once you use more than 12kw a day rate goes up to $0.32/kw in this area . Prices vary slightly , rates are very similar , connection fees per month tend to be discounted with a "Pay on time" discount as an incentive of up to 20% off connection fee's (usually around $45 Aus a month).

Privatised networks on a land mass similar to the USA with a population of 22 million mostly in 7 city's , A distribution network that's also separately privatised and Government incentives to expand the distribution network capacity in excess then bill the people continue to put pressure on increasing connection fees by 10 to 15% PA.

With a huge uptake of grid connect solar power company's are now VERY concerned with the New plug and play grid connect battery systems making people's installs less dependant on the grid.

There is a strong push from what you would call Lobbyist's on our Politicians to pass legislation to allow distribution network company's to charge connection fees to sites not connected as long as the grid passes the property .

Ie the pole passes your house you pay no matter if your connected or not. Acting as a dis incentive for full grid independence .
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Old 05-23-16, 09:03 AM   #13
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I agree with the importance of reducing peak demand. Peak demand reduction is as important as overall demand reduction, and both normally occur at the peak demand time of day. Both types of demand reduction lead to less need for capacity or to a slower growth in capacity than would otherwise exist. At the cost of a direct cash investment in demand reduction incentives, often while carrying significant cash reserves that aren't getting them much return anyway, the utility company can save on future growth in capacity and gain options -- e.g. the flexibility to install a more efficient plant that takes longer to build, or to finance a plant when interest rates are lower, etc. etc.

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