A Homemade Life
Welcome to Homemade Life.

To take full advantage of everything offered by our forum, please log in if you are already a member or join our community if not ....

Chilli-head
Who is online?
In total there are 2 users online :: 0 Registered, 0 Hidden and 2 Guests

None

Most users ever online was 62 on 10th April 2015, 8:24 am
Latest topics
» Plummeting potato sales
by Ploshkin Today at 5:13 pm

» New Things In Your Pond Today...
by FloBear Yesterday at 4:57 pm

» The neglected August garden
by Ploshkin Yesterday at 12:45 pm

» The magazine rack
by Chilli-head 12th August 2018, 7:55 pm

» What are you harvesting today?
by Dandelion 12th August 2018, 1:25 pm

» What arts and craft things have you been making lately?
by FloBear 30th July 2018, 1:53 pm

» Trying to avoid wilting in the July garden
by Dandelion 29th July 2018, 4:03 pm

» whats on the menu
by FloBear 27th July 2018, 12:32 pm

» Weekend at the Kettlewell hostel
by Chilli-head 13th July 2018, 4:56 pm

» No-dig gardening & weed control
by freebird 10th July 2018, 7:40 pm

» Pest Controls...
by Chilli-head 9th July 2018, 2:09 pm

» Summer has arrived in the garden in June
by Dandelion 26th June 2018, 9:26 pm

» Proud for once ....
by freebird 18th June 2018, 8:22 am

» An excellent walk - 3 days in Snowdonia
by FloBear 8th June 2018, 6:23 pm

» Hoping there May be a bit less rain on the garden !
by Chilli-head 31st May 2018, 8:40 pm

» Housekeeping
by Dandelion 31st May 2018, 4:42 pm

» Breadmaker recipes
by FloBear 8th May 2018, 9:16 am

» Hand Weeding Tool
by FloBear 2nd May 2018, 5:03 pm

» Gardening between the April showers
by FloBear 30th April 2018, 8:52 am

» What have I done in the workshop today?
by Chilli-head 28th April 2018, 6:51 pm

Statistics
We have 239 registered users
The newest registered user is IanF

Our users have posted a total of 45765 messages in 2360 subjects
HML on FaceBook
RSS feeds



Donate to our Charity
The Homemade life supports Kiva - microloans for people in developing countries working to change their lives.  These loans are repaid to our KIVA account, so your donation is used many times to help different people - literally the gift that keeps on giving..

Import/export meter

Go down

default Import/export meter

Post by Compostwoman on 28th May 2011, 3:52 pm

Maybe not quite what the Workshop is generally used for on here...but Compostman has just built and is testing out an electricity Import /Export meter, for the PV's.

He used an Arduino Uno microcontroller, a current transformer and a plug in the wall power supply, plus a bit of Cm designed and built circuitry. He used a lot of helpful info from

HERE

It is running on the laptop at the moment, but eventually will have its own, small display plus an SD card to store the data on for downloads at regular periods.


It displays the Voltage ( if it is -ve, we are EXPORTING hurrah) Current, Power factor and a few other bits of info.

Mesmerising to watch it go up and down, as we use various bits of kit or as the clouds go in front of the Sun.

Will allow us to monitor our electriciy usage so as to alter even more our usage patterns to match up to when we are generating our own electricity. We want to try to use as much as we can when we are generating, so we are not exporting during the day, and then importing during the night!

I am so impressed with Compostman, he continually surprises me with his skills!

Compostwoman

Posts : 5689
Join date : 2009-11-08

Back to top Go down

default Re: Import/export meter

Post by Compostwoman on 28th May 2011, 7:10 pm







Screen showing us importing electricity ( boo, hiss!) in the first column.




Columns (L-R) are

PV power generated, apparent power (Vrms x I), power factor, V rms, I rms.

Screen showing us exporting electricity ( hurrah!)

Compostwoman

Posts : 5689
Join date : 2009-11-08

Back to top Go down

default Re: Import/export meter

Post by Compostwoman on 28th May 2011, 7:24 pm

Oh and I have just had it pointed out to me Rolling Eyes that I said it recorded Voltage, in my first post. Of course I meant Power. Cool

Compostwoman

Posts : 5689
Join date : 2009-11-08

Back to top Go down

default Not quite right...

Post by Compostman on 28th May 2011, 7:31 pm

The 5 columns are actually:
Nett real power coming into the house from the grid, so negative numbers mean export
Apparent power (product of rms voltage and current)
Power factor (ratio of the two above and deviates from 1 for reactive loads like motors or fluorescent lamps)
Mains voltage (rms)
Mains current (rms)
avatar
Compostman

Posts : 1
Join date : 2011-05-28

Back to top Go down

default Ooops.

Post by Compostwoman on 28th May 2011, 7:34 pm

Compostman wrote:The 5 columns are actually:
Nett real power coming into the house from the grid, so negative numbers mean export
Apparent power (product of rms voltage and current)
Power factor (ratio of the two above and deviates from 1 for reactive loads like motors or fluorescent lamps)
Mains voltage (rms)
Mains current (rms)

I knew there was a good reason why I didn't want you on here! Rolling Eyes Laughing Laughing

I sit, corrected ( a bit like the figures!)

Compostwoman

Posts : 5689
Join date : 2009-11-08

Back to top Go down

default Re: Import/export meter

Post by mark barker on 28th May 2011, 8:45 pm

Welcome CM! Breadboard electronics, love it!


Looks like CW is going to have to behave now! Wink

................................................................................................................................
It's nice to be important but it's more important to be nice.
avatar
mark barker

Posts : 659
Join date : 2010-07-29
Age : 43
Location : Swindon, Wiltshire

Back to top Go down

default Re: Import/export meter

Post by Compostwoman on 28th May 2011, 11:26 pm

mark barker wrote:Welcome CM! Breadboard electronics, love it!


Looks like CW is going to have to behave now! Wink

Ha,ha, you wish. Laughing Shocked

Compostwoman

Posts : 5689
Join date : 2009-11-08

Back to top Go down

default Re: Import/export meter

Post by mr_sfstk8d on 30th May 2011, 3:16 am

Mmm.. breadboard and IC tinkering, lovely.

So, the kit is producing about 1.3 kVA at any time, abouts? Or that's the net plus? I take it to read net plus. What's the kit total output, y'know perfectly sunny, full moon, plucking the right goose feathers, etc. And what do you average? Or is this still addressing the questions of "What is says on the tin" vs what it does on MY roof? Can't wait to see how it goes.
avatar
mr_sfstk8d

Posts : 584
Join date : 2010-12-01
Age : 40
Location : Peoria, IL, US

Back to top Go down

default Re: Import/export meter

Post by Compostwoman on 30th May 2011, 11:37 am

mr_sfstk8d wrote:Mmm.. breadboard and IC tinkering, lovely.

So, the kit is producing about 1.3 kVA at any time, abouts? Or that's the net plus? I take it to read net plus. What's the kit total output, y'know perfectly sunny, full moon, plucking the right goose feathers, etc. And what do you average? Or is this still addressing the questions of "What is says on the tin" vs what it does on MY roof? Can't wait to see how it goes.

In that last photo of the screen shop, we were exporting about 1.3 because we had the washing machine running and various fridges, freezers etc.

It was actually producing about 2.4. ( I fully expect CM to log in and correct me, but he isn't here so I will give you a rough figure.... Rolling Eyes )

April and May have been particularly good months for sunshine, here!

Average figures...well they reside on CM's computer ..we have a daily log from since it first went on the roof last year.

If you are interested see http://forum.homemadelife.com/t706p10-pv-s-going-up-at-compost-mansions


Compostwoman

Posts : 5689
Join date : 2009-11-08

Back to top Go down

default Re: Import/export meter

Post by Sponsored content


Sponsored content


Back to top Go down

Back to top

- Similar topics

 
Permissions in this forum:
You cannot reply to topics in this forum