iPlug
Posts: 420
Joined: Thu Apr 28, 2016 6:47 pm
Delivery Date: 25 Apr 2016
Location: Rocklin, CA

Re: Share Your Home Electrification/Efficiency Improvements

Sun Aug 04, 2019 8:15 am

Agree. This seems to (currently) mostly be a problem on a few days with some cool sunny spring weather, but can get worse as renewables become ever greater portions of the energy portfolio.

To improve the current situation, would hope to ultimately have home battery buffering/real peak shaving in a few years with up to the second real time spot market TOU grid communication to buy/sell electricity with the grid based on instantaneous grid demand.
'19 Model 3 SR+ (own), '19 Leaf SV (leased), '12 Plug-in Prius (sold 3/19), '16 Leaf SV (prior lease), 11.43kW Solar PV (16MWh/yr real production), 20.5 SEER/13.0 HSPF ducted air-source heat pump, 3.70 UEF heat pump water heater, Induction Cooktop

Flyct
Posts: 265
Joined: Tue Nov 03, 2015 12:04 am
Delivery Date: 02 Dec 2015
Leaf Number: 307113
Location: Bradenton, Florida, US

Re: Share Your Home Electrification/Efficiency Improvements

Sun Aug 04, 2019 8:28 am

We replaced all 35 windows and sliding glass doors with Hurricane rated high energy efficient doors and windows 35 windows and 25 feet of 8 foot tall sliding glass doors

3,100 sq ft living space single story house in Florida. Replaced the AC with a ultra high efficient Daikin Inverter with 3 zone system. 21 seer. The AC varies between 1.5 tons and 5 tons depending on heat load. It runs almost 20 hours a day. Blower CFM modulates between 500-1900 cfm and compressor also modulates. Temp in house stays within 0.4 degrees of set point anywhere in the house.

Replaced pool heater with high efficient 5 ton heat pump

Been driving a Nissan Leaf for over 4 years and a Hybrid for over 15 years.
2019 Leaf SL Plus w/All Options
2015 Lexus RX450h Hybrid SUV
2019 Ford F-350 Lariat Ultimate Crew Cab Short Bed Diesel
2017 Grand Design Reflection 337RLS 5th Wheel RV
2017 Kawasaki FXT-Pro LE Side by Side
Blissfully Retired and loving it!

SageBrush
Posts: 4907
Joined: Sun Mar 06, 2011 2:28 am
Delivery Date: 13 Feb 2017
Location: NM

Re: Share Your Home Electrification/Efficiency Improvements

Sun Aug 04, 2019 8:31 am

iPlug wrote:
Sun Aug 04, 2019 8:15 am
Agree. This seems to (currently) mostly be a problem on a few days with some cool sunny spring weather, but can get worse as renewables become ever greater portions of the energy portfolio.
Utilities, either because they own the generating assets or have contracts that mandate purchase, have a "baseload" of generation they will run and curtail other assets if not required. As a very general observation, PV and wind are being used to avoid spot purchases of peaker plant NG output. Outside of peak hours the grid is overwhelmingly supplying its "baseload" mix.

As I said earlier in an addendum, unless you know the specifics of your grid and its suppliers, self-consumption should be the default choice.
2013 LEAF 'S' Model with QC & rear-view camera
Bought off-lease Jan 2017 from N. California
Two years in Colorado, now in NM
03/2018: 58 Ahr, 28k miles
11/2018: 56.16 Ahr, 30k miles
-----
2018 Tesla Model 3 LR, Delivered 6/2018

iPlug
Posts: 420
Joined: Thu Apr 28, 2016 6:47 pm
Delivery Date: 25 Apr 2016
Location: Rocklin, CA

Re: Share Your Home Electrification/Efficiency Improvements

Sun Aug 04, 2019 9:43 am

Flyct wrote:
Sun Aug 04, 2019 8:28 am
...Replaced pool heater with high efficient 5 ton heat pump...
Excellent. Would be good to see more people do the same who heat their pools currently with electric resistance or NG.


SageBrush wrote:
Sun Aug 04, 2019 8:31 am
Utilities, either because they own the generating assets or have contracts that mandate purchase, have a "baseload" of generation they will run and curtail other assets if not required. As a very general observation, PV and wind are being used to avoid spot purchases of peaker plant NG output. Outside of peak hours the grid is overwhelmingly supplying its "baseload" mix.

As I said earlier in an addendum, unless you know the specifics of your grid and its suppliers, self-consumption should be the default choice.
Concur. We do know our specifics.

Here is our PG&E portfolio as of most recently available 2017 data:

https://www.pge.com/pge_global/common/p ... ontent.pdf

Only 2% market purchases and only 2% unspecified power.

On the hot summer afternoons like we have around these months with AC use blazing, can feel pretty confident all of our excess solar PV is offsetting peaker NG PG&E plants and would have a high spot market value during this time. Only 8 of our 43 PV panels are not on south or west facing roof slopes.

On the other side of the equation, the off peak energy we consume would be nearly carbon free Diablo Canyon nuclear, large hydroelectric, small hydroelectric, wind, geothermal, and biomass/waste. No coal base-load.

Agree the accounting probably does not work out so well for many others, particularly in states that use coal for baseload generation.
'19 Model 3 SR+ (own), '19 Leaf SV (leased), '12 Plug-in Prius (sold 3/19), '16 Leaf SV (prior lease), 11.43kW Solar PV (16MWh/yr real production), 20.5 SEER/13.0 HSPF ducted air-source heat pump, 3.70 UEF heat pump water heater, Induction Cooktop

SageBrush
Posts: 4907
Joined: Sun Mar 06, 2011 2:28 am
Delivery Date: 13 Feb 2017
Location: NM

Re: Share Your Home Electrification/Efficiency Improvements

Sun Aug 04, 2019 10:54 am

^^ That is a grid to be proud of in terms of carbon emissions. I'm jealous.

As for when to use the water heat pump, I think you are right for the summer.
The winter may be different
2013 LEAF 'S' Model with QC & rear-view camera
Bought off-lease Jan 2017 from N. California
Two years in Colorado, now in NM
03/2018: 58 Ahr, 28k miles
11/2018: 56.16 Ahr, 30k miles
-----
2018 Tesla Model 3 LR, Delivered 6/2018

User avatar
Marktm
Gold Member
Posts: 518
Joined: Thu Jan 21, 2016 10:49 am
Delivery Date: 09 Jan 2016
Leaf Number: 022737
Location: Houston, TX

Re: Share Your Home Electrification/Efficiency Improvements

Sun Aug 04, 2019 2:09 pm

Our home is 30+ years old. , A/C units are 15+ years old and not so efficient. Windows are single pane. Size is ~3500 sq ft. We use (yearly average) 1000 kWh/month that is mainly for A/C cooling and charging my Leaf - obviously some appliances. The monthly usage is quite cyclical and varies by a factor of 2x in summer. All other major energy users are nat gas - common for a house this age, especially in Houston.

Our electricity supplier is Griddy that charges us $10/month to "sell" us energy at the ERCOT pricing - and passes along the transmission+add-ons at cost. I almost exclusively charge the Leaf early morning and use my programmable thermostat to "precool" the house later at night and early morning. I let the temperature rise from 73 degrees to 79 degrees in increments during the day and cool back down as we retire for the night.

Over a one year period, I've saved about $300 in electrical costs by using cheap energy at night (total bill approx $1200 for the year). If everyone in Houston were to do this, I'd guess that the energy cost differences during peak to off peak would likely disappear - would be self defeating, but a boon to the area grid!! BTW, the energy costs are usually 3.5 to 7 cents/kWh during peaks and 1.5 to 2 cents/kWh late at night during the summer as the grid becomes maxed out (7.5 cents currently). In fact, it is quite often 30 to 90 cents/kWh for short periods. I've seen it as high a $9/kWh (the max). I use both the Griddy app (very nice) and IFTTT alerts to call my wife if something out of the ordinary is going on. So far, not had to go above 79 degrees :mrgreen:

Caveat - kids are grown and gone! We don't have to air condition the outdoors anymore.
2012 Leaf SL; 43,000 miles. Battery replaced November 1st, 2016.

SageBrush
Posts: 4907
Joined: Sun Mar 06, 2011 2:28 am
Delivery Date: 13 Feb 2017
Location: NM

Re: Share Your Home Electrification/Efficiency Improvements

Sun Aug 04, 2019 3:03 pm

Two people, 2800 SF home in high desert of NM. It gets hot (but rarely over 100F) in the summer and humidity is low. Winter drops into the teens F
July we consumed 350 kWh for the house and two EVs.

I'm thinking about improving the house envelope so that we can add some moderate cooling in the summer and also use less NG in the winter heating season.
Last edited by SageBrush on Mon Aug 05, 2019 4:30 am, edited 1 time in total.
2013 LEAF 'S' Model with QC & rear-view camera
Bought off-lease Jan 2017 from N. California
Two years in Colorado, now in NM
03/2018: 58 Ahr, 28k miles
11/2018: 56.16 Ahr, 30k miles
-----
2018 Tesla Model 3 LR, Delivered 6/2018

iPlug
Posts: 420
Joined: Thu Apr 28, 2016 6:47 pm
Delivery Date: 25 Apr 2016
Location: Rocklin, CA

Re: Share Your Home Electrification/Efficiency Improvements

Sun Aug 04, 2019 3:24 pm

SageBrush wrote:
Sun Aug 04, 2019 10:54 am
^^ That is a grid to be proud of in terms of carbon emissions. I'm jealous.

As for when to use the water heat pump, I think you are right for the summer.
The winter may be different
We will probably run the heat pump water heater during the daylight portion of the 21 hour off-peak winter window before the partial peak 5-8pm hours (no peak hours in winter). Things work out quite nicely as there is little if any solar flux from 5-8pm with early winter sunset time.

Further, ambient temperatures conveniently are highest during sunlit hours, which guarantees heat pump use during highest solar flux ensuring both highest energy transfer efficiency and maximal renewable energy use.

Would love to see reports of PG&E grid energy mix by source and time and day of year to see detailed curtailment patterns to know how best to further play this game for environmental impact. Good to hear similarly minded folks at least as interested in such things.

A bigger issue for us in winter is heat pump ducted air usage to warm the house, especially during the colder nights. No sunlight then and a cost reasonable residential battery solution yet awaits. Would like to see exactly what our PG&E grid is up to with energy input sources and renewable curtailments, if any, during that time. Best I can surmise, non-carbon sources would still be very high at this time.

Grid solar inputs would be relatively low that time of year, so don’t imagine much in the way of needing curtailments there. Not sure if they ramp down NG inputs for electricity generation then since houses aren’t running AC, rather burning NG directly to stay warm instead of a few heat pump folks like our household who actually don’t decrease their winter electricity use.
'19 Model 3 SR+ (own), '19 Leaf SV (leased), '12 Plug-in Prius (sold 3/19), '16 Leaf SV (prior lease), 11.43kW Solar PV (16MWh/yr real production), 20.5 SEER/13.0 HSPF ducted air-source heat pump, 3.70 UEF heat pump water heater, Induction Cooktop

SageBrush
Posts: 4907
Joined: Sun Mar 06, 2011 2:28 am
Delivery Date: 13 Feb 2017
Location: NM

Re: Share Your Home Electrification/Efficiency Improvements

Sun Aug 04, 2019 3:34 pm

iPlug wrote:
Sun Aug 04, 2019 3:24 pm
Would love to see reports of PG&E grid energy mix by source and time and day of year to see detailed curtailment patterns to know how best to further play this game for environmental impact.
-
Exactly


We will probably run the heat pump water heater during the daylight portion of the 21 hour off-peak winter window before the partial peak 5-8pm hours (no peak hours in winter). Things work out quite nicely as there is little if any Solar flux from 5-8pm with early winter sunset time.
-
I had the same thought
2013 LEAF 'S' Model with QC & rear-view camera
Bought off-lease Jan 2017 from N. California
Two years in Colorado, now in NM
03/2018: 58 Ahr, 28k miles
11/2018: 56.16 Ahr, 30k miles
-----
2018 Tesla Model 3 LR, Delivered 6/2018

Oilpan4
Gold Member
Posts: 850
Joined: Wed Jan 09, 2019 10:51 pm
Delivery Date: 10 May 2018
Leaf Number: 004270

Re: Share Your Home Electrification/Efficiency Improvements

Sun Aug 04, 2019 11:14 pm

I don't use natural gas.
That's why I got the forced air coal furnace to do the lion's share of home heating in the winter.
2011 white SL leaf with 2014 batt.
Chargers: Panasonic brick moded for 240v, duosida 16a 240v and a 10kw setec portable CHAdeMO
Location: 88103

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