Geekzone: technology news, blogs, forums
Guest
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.




1132 posts

Uber Geek
+1 received by user: 254


Topic # 199024 1-Aug-2016 14:04
4 people support this post
Send private message

I've promised to everyone who had voted for me during the Future of Energy Competition last year to publish stats online.

 

Panels: 12 x 250W (3kW), 22 Degrees Elevation, Azimuth 306 (N54-W).

 

Battery: Tesla PowerWall 6.4kWh Li Pack.

 

Stats for the first full month (July 2016) are now available.

 

To give the bigger picture I've added historical data for the Mean Sunshine and Rainfall in Auckland.

 

Will be updating monthly here:

 

https://www.facebook.com/toyotahybridbatteryexperts

 

 


View this topic in a long page with up to 500 replies per page Create new topic
 1 | 2 | 3 | 4
5287 posts

Uber Geek
+1 received by user: 2144


  Reply # 1602304 1-Aug-2016 15:06
Send private message

I never realised Auckland was so wet.  It's practically Fiordland.





Mike



1132 posts

Uber Geek
+1 received by user: 254


  Reply # 1602473 1-Aug-2016 20:20
Send private message

MikeAqua:

 

I never realised Auckland was so wet.  It's practically Fiordland.

 

 

In comparison to other places in the World on the same latitude it dries out very quickly. Talking from experience of 100% humidity and minus temperatures, brrrrr


 
 
 
 




1132 posts

Uber Geek
+1 received by user: 254


  Reply # 1620623 1-Sep-2016 08:44
Send private message
1032 posts

Uber Geek
+1 received by user: 75

Subscriber

  Reply # 1620625 1-Sep-2016 08:53
Send private message

RUKI:

Solar Stats for August:


https://www.facebook.com/toyotahybridbatteryexperts/



In the graph what does self consumption mean compared to consumption?

Jon



1132 posts

Uber Geek
+1 received by user: 254


  Reply # 1620736 1-Sep-2016 10:30
Send private message

jonherries:
In the graph what does self consumption mean compared to consumption?
Jon

 

"Consumption" is overal consumtion of electricity from all sources - grid and solar.

 

"Self-Consumption" is consumption from the Solar System

 

During the day "Self-consumption" could be from both sources  - from the panels & from the battery.

 

After sunset if battery is still charged "self consumption" will be from the battery.  For example yesterday Solar Production stopped at 17:30 but battery was charged to about 96%. It fully discharged at about 22:45 allowing us to use energy stored in it.

 

Our system is set up for "maximum" "Self-consumption" meaning that we are using almost everything that Solar System generates for our needs and not for export. Hence the Bar for Self Consumption is almost similar to the Solar Production Bar. Last bill showed we only gave back to the grid 11 KWh and being paid $0.88 for it :-) (@8.8C/kWh)


21607 posts

Uber Geek
+1 received by user: 4429

Trusted
Subscriber

  Reply # 1620878 1-Sep-2016 14:06
Send private message

I have no battery at all, and a pretty underwhelming system that has produced about 2.3kW at its best.

 

Last months genesys send me a paper buyer created invoice for the 1 unit I exported, totalling 6 cents, with a GST amount on it etc. They send it by snail mail because they dont to electronic invoicing on the buyer created ones for solar purchasing.

 

Damn waste of paper and time, but that is life with accountants I guess.





Richard rich.ms

561 posts

Ultimate Geek
+1 received by user: 89

Trusted

  Reply # 1620884 1-Sep-2016 14:25
Send private message

Did you win one of the places in the Future of Energy Competition?




1132 posts

Uber Geek
+1 received by user: 254


  Reply # 1620885 1-Sep-2016 14:30
2 people support this post
Send private message

dacraka:

 

Did you win one of the places in the Future of Energy Competition?

 

 

Correct. System was installed a year later after that competition. While campaiging a year ago I've made a promise to share stats so that people of New Zealand can make an informed decision. Now following on those promises I've made...


1032 posts

Uber Geek
+1 received by user: 75

Subscriber

  Reply # 1621228 2-Sep-2016 09:54
Send private message

RUKI:

jonherries:
In the graph what does self consumption mean compared to consumption?
Jon


"Consumption" is overal consumtion of electricity from all sources - grid and solar.


"Self-Consumption" is consumption from the Solar System


During the day "Self-consumption" could be from both sources  - from the panels & from the battery.


After sunset if battery is still charged "self consumption" will be from the battery.  For example yesterday Solar Production stopped at 17:30 but battery was charged to about 96%. It fully discharged at about 22:45 allowing us to use energy stored in it.


Our system is set up for "maximum" "Self-consumption" meaning that we are using almost everything that Solar System generates for our needs and not for export. Hence the Bar for Self Consumption is almost similar to the Solar Production Bar. Last bill showed we only gave back to the grid 11 KWh and being paid $0.88 for it :-) (@8.8C/kWh)



So 250 into 1000 goes four times. Does this mean you have effectively met 25% of your electricity demand with this system in August? How much better will it be in summer do you think?

Jon



1132 posts

Uber Geek
+1 received by user: 254


  Reply # 1621266 2-Sep-2016 10:28
Send private message

jonherries:

So 250 into 1000 goes four times. Does this mean you have effectively met 25% of your electricity demand with this system in August? How much better will it be in summer do you think?

Jon

 

System Production in August was 256, Self-Consumption in August was 236/1010 ~ 23.4%

 

In summer there will be less consumption and solar production should be higher.

 

This snapshot below illustrates Solar Production and Self-Consumption during one of the recent sunny days in August:

 


654 posts

Ultimate Geek
+1 received by user: 169


  Reply # 1621278 2-Sep-2016 10:48
One person supports this post
Send private message

RUKI:

 

This snapshot below illustrates Solar Production and Self-Consumption during one of the recent sunny days in August:

 

 

 

That's a great graph, It clearly show why solar in uneconomic for most people if the can't store the power in some form (hot water, battery etc).




1132 posts

Uber Geek
+1 received by user: 254


  Reply # 1621290 2-Sep-2016 11:06
Send private message

KrazyKid:

 

That's a great graph, It clearly show why solar in uneconomic for most people if the can't store the power in some form (hot water, battery etc).

 

 

You right about the storage but I would disagree with a statement that picture "clearly show why"... Too early to say "uneconimic". Solar Edge is publishing stats for UK and Australia with some examples where self-consumption is close to 100%! We'll see how it goes in Auckland, NZ.

 

Think about other people who in comparison to our (and maybe yours) situation consume 40% less electricity. I've seen response from one Wellingtonian - they have uploaded their August bill (~60% of our consumption).

 

 

There are other people who's activity is mainly during the day and they use gas for heating and for hot water. Our place does not have wood or gas burner..

 

"Uneconomic" depends on many factors including of course initial investment. Prices for panels are going down every year. Efficiency of the new generation of panels grows. They have started making roofing material in the form of the solar panels - that would be really cool. Electricity Prices are going up 5% p.a. Sun is still shining.

 

The stats I will collect during the year will provide basis for calculations.


654 posts

Ultimate Geek
+1 received by user: 169


  Reply # 1621300 2-Sep-2016 11:20
Send private message

RUKI:

 

 Electricity Prices are going up 5% p.a. Sun is still shining.

 

 

First off keep up the good work. Interesting reading and raises awareness.

 

I disagree with the prices going up in NZ at the moment by 5% pa. Demand for electricity is flat in NZ and if the smelter closes all bets are off. But that's a small point.

 

I personally feel the for my own situation (Dunedin's limited sun hours and low use during the day) it will be a few more years before the prices/efficiency will give me a break even return over 10 years. But if we get near break even I'll be installing them in a flash.

 

NZ can't really use the green argument for solar since we produce so much power by Hydrothermal - especially for me in the SI. I think buying a eclectic or hybrid car is a greener move in my situation ATM.




1132 posts

Uber Geek
+1 received by user: 254


  Reply # 1624679 6-Sep-2016 15:56
Send private message

Today, Auckland @ 15:30:

 

 

 


7829 posts

Uber Geek
+1 received by user: 2581

Subscriber

  Reply # 1624680 6-Sep-2016 15:58
Send private message

so going off your info you are charging up your battery storage and using that completely every day? how many recharge cycles do the batterys have in them?  what sort of output do you get from the batteries?


 1 | 2 | 3 | 4
View this topic in a long page with up to 500 replies per page Create new topic



Twitter »

Follow us to receive Twitter updates when new discussions are posted in our forums:



Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:



Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:



Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.



Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.