EcoRenovator  

Go Back   EcoRenovator > Improvements > Conservation
Advanced Search
 


Blog 60+ Home Energy Saving Tips Recent Posts Search Today's Posts Mark Forums Read


Reply
 
Thread Tools Display Modes
Old 09-20-12, 09:10 PM   #1
ownerbuilder2012
Aspiring Renovator
 
Join Date: Sep 2012
Location: Australia
Posts: 11
Thanks: 0
Thanked 0 Times in 0 Posts
Default Motion sensors

Hi everyone,

I have a question, is it energy efficient to use Motion sensors in rooms to detect if anyone is using it, and if not automatically turns off every electrical equipment.

Come to think of it the motion sensors also consume energy for it to run?

Would love to hear your thoughts on this one.

ownerbuilder2012 is offline   Reply With Quote
Old 09-21-12, 09:04 AM   #2
Higgy
The Gardener
 
Join Date: Oct 2008
Location: Manitoba - Canada
Posts: 492
Thanks: 17
Thanked 8 Times in 7 Posts
Default

Good question. I could see doing that with lights, but not a tv. That would just bug me after a while to have to turn the tv back on every time I got up to pee or go for a snack. Actually it would bug me to have to turn the light back on as well.

Maybe if you could set the sensor to turn things off after a certain period of time.

I don't know, the more I think about it the more I think that it's useless unless you were to just put it into a bathroom or something for people who forget to turn the light off. It would also have to be more of a heat sensor then motion though. How often do you move while watching TV, or reading a book.
Higgy is offline   Reply With Quote
Old 09-21-12, 09:43 AM   #3
Daox
Administrator
 
Daox's Avatar
 
Join Date: Aug 2008
Location: Germantown, WI
Posts: 5,525
Thanks: 1,162
Thanked 374 Times in 305 Posts
Default

Its energy efficient if you are lazy (or just not paying any attention to energy usage, example: kids) and don't turn off the lights yourself. If you remember to turn things off when you leave a room then its not going to save you anything.
__________________
Current project -
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
&
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Daox is offline   Reply With Quote
Old 09-21-12, 12:08 PM   #4
Xringer
Lex Parsimoniae
 
Xringer's Avatar
 
Join Date: Feb 2009
Location: Woburn, MA
Posts: 4,918
Thanks: 114
Thanked 250 Times in 230 Posts
Default

I don't think sensors would help very much for lighting, unless the lights were also controlled by a smart computer program.

Just using Off-the-shelf units will turn on the lights for a set minimum time cycle,
each time someone was in the room, even if it was only for a few seconds.

The other big problem I have with my automatic lights, if I'm not constantly moving around,
they go off, normally at the worst possible moment.
__________________
My hobby is installing & trying to repair mini-splits
EPA 608 Type 1 Technician Certification ~ 5 lbs or less..
Xringer is offline   Reply With Quote
Old 09-21-12, 12:16 PM   #5
Daox
Administrator
 
Daox's Avatar
 
Join Date: Aug 2008
Location: Germantown, WI
Posts: 5,525
Thanks: 1,162
Thanked 374 Times in 305 Posts
Default

You would need what they call occupancy sensors. They use motion, sound, and some even use more to detect if someone is in the room.
__________________
Current project -
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
&
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Daox is offline   Reply With Quote
The Following User Says Thank You to Daox For This Useful Post:
Ryland (09-21-12)
Old 09-21-12, 05:42 PM   #6
Ryland
Master EcoRenovator
 
Join Date: Mar 2009
Location: Western Wisconsin.
Posts: 913
Thanks: 127
Thanked 82 Times in 71 Posts
Default

I have two motion sensors in my house, they are the common ones that every big box store sells.
I have one in my garage so when I open up the door and walk in with my bike the light turns on, I can also see my garage from inside the house so if I see the light come on at night I know someone is in my garage! I also never have to worry about someone leaving the light on out there for hours and hours and it never comes on in the day time.
my other motion sensor light switch is in my entry way because the light switch is not near the door, I also often come in that door with groceries in my hands, for that room it's really nice to not have to fumble for a switch or take my shoes off in the dark, if you stop moving it doesn't always realize you are still there and the light turns off after 60 seconds.
Neither of these motion sensors work with CFL or LED bulbs, the LED never turns off and the CFL flickers on and off because the switch it's self draws around 2 watts in standby mode.

One other place that I've seen a motion sensor work really well was in a bath room hooked to the vent fan, it had it's on time dial cranked up to 10 minutes or so and every time you went in the bath room the fan came on, that bath room had a lot of repairs done due to moisture problems and this was part of the fix after the rot was taken care of, it was also in a rental so you couldn't rely on a well trained home owner.

I would like to try some occupancy sensor switches and see how they compare, my entry way is getting a washing machine hooked up soon, so a better sensor in there would be nice.
Ryland is offline   Reply With Quote
The Following User Says Thank You to Ryland For This Useful Post:
chrisnotap (10-01-12)
Old 09-21-12, 07:15 PM   #7
S-F
You Ain't Me
 
S-F's Avatar
 
Join Date: Nov 2009
Location: Northampton MA
Posts: 662
Thanks: 6
Thanked 71 Times in 58 Posts
Default

This is a tuff nut to crack. I use home automation and have kids. Sensing occupancy is difficult. I plan on putting flex sensors in the floor that isn't masonry and bed sensors but what about the basement slab? My kids are peaceful and calm but they sometimes forget to turn the lights off.
__________________
My project:


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


Chipping away on a daily basis.

Quote:
You know you're an ecorenovator if anything worth insulating is worth superinsulating.
Quote:
S-F: "What happens when you slam the door on a really tight house? Do the basement windows blow out?"

Green Building Guru: "You can't slam the door on a really tight house. You have to work to pull it shut."
S-F is offline   Reply With Quote
Old 09-21-12, 07:31 PM   #8
Xringer
Lex Parsimoniae
 
Xringer's Avatar
 
Join Date: Feb 2009
Location: Woburn, MA
Posts: 4,918
Thanks: 114
Thanked 250 Times in 230 Posts
Default Old and forgetful..

Sometimes, I forget to turn off the lights.. But, I use these..



At 7.5 watts, it's going to take a while to run up the bill..
__________________
My hobby is installing & trying to repair mini-splits
EPA 608 Type 1 Technician Certification ~ 5 lbs or less..
Xringer is offline   Reply With Quote
Old 09-21-12, 08:02 PM   #9
S-F
You Ain't Me
 
S-F's Avatar
 
Join Date: Nov 2009
Location: Northampton MA
Posts: 662
Thanks: 6
Thanked 71 Times in 58 Posts
Default

Being an ecorenovator is a state of mind. I mainly use incandescent bulbs because dimming is important to me, but I am vigilant about their on time. Often the houses I work in have already had an energy audit where all their bulbs have been replaced with CFL's and they are on all the time. "It's OK. There're CFL's".
__________________
My project:


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


Chipping away on a daily basis.

Quote:
You know you're an ecorenovator if anything worth insulating is worth superinsulating.
Quote:
S-F: "What happens when you slam the door on a really tight house? Do the basement windows blow out?"

Green Building Guru: "You can't slam the door on a really tight house. You have to work to pull it shut."
S-F is offline   Reply With Quote
Old 09-22-12, 07:39 AM   #10
Daox
Administrator
 
Daox's Avatar
 
Join Date: Aug 2008
Location: Germantown, WI
Posts: 5,525
Thanks: 1,162
Thanked 374 Times in 305 Posts
Default

Yeah, the previous owner of my house had the same mindset. "Oh, it only costs $5/mo to run those lights". They had the basement lights (3 - 14W CFLs and 1 - 20W tube florescent, so 60W total on) wired to be on all the time. In fact, one of the first changes to the house was to wire in a switch! $5 bucks a month to have lights on that you aren't even using 99% of the time.

__________________
Current project -
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
&
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Daox is offline   Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 05:05 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Ad Management by RedTyger
Inactive Reminders By Icora Web Design