Multioutlet timers - can the outlets be controlled individually?

purklize

Active Member
Are there any digital timers that would allow me to, say, have one outlet run 12/12, and another run 18/6, with the 6 off being at the same time as the 12 on, and the same with another 18/6 (this one being offset from the other 18/6)? The idea is to keep the watts down so I don't trip the circuit breaker, so I can use bigger lights. Using multiple timers won't work, they drift and if they're on different times, both lights might click on and trip the power when I'm not here (with DWC, that's disaster).

Outlet 1: On from 6pm-6am, off 6am-6pm
Outlet 2: On from midnight-6pm, off 6pm-midnight
Outlet 3: On from 6pm-noon, off noon-6pm
 

john84

Active Member
Maybe I'm confused but how is that going to allow you to keep the watts down? You're still going to have a 6 hour overlap where you're 12/12 and 18/6 are running at the same time
 

cowell

Well-Known Member
Not that I know of.. What does "bigger lights?" mean? You should just consider getting 2 mechanical timers.. they are like $5-15 depending on what you want in a timer, and if you can get it on sale. Then you can set them for whatever you want... and I wouldn't run all your lights off one outlet either... if you can even turn them all on without tripping your breaker.
 

purklize

Active Member
With three times, their internal clocks are going to drift out of sync. That's the problem. The timing has to be perfect for this to work.

If I have two veg lights that are 200w on 18/6, and one 400w HPS on 12/12, I can set the first veg light to be off for the first 6 hours that the HPS is on, and the second to be off for the second 6 hours. This way, there is never more than one 200w veg light on when the 400w HPS is on. This lowers the peak wattage of the system by 200w.

I've had 600w of lights running off one outlet for 6 months without any problems. Hairdryers and space heaters use far more (typically 1500w), so I'm not too concerned.
 

purklize

Active Member
Again I'm worried about using mulitple mechanical timers. They will drift out of sync, and if I'm maxing out the watts the circuit can handle, all of them being on briefly for even one second could trip the power.
 

purklize

Active Member


Perhaps this image will help... it represents the light cycle, grey being off. The x axis continues from midnight to midnight, a 24 hour window. The first row represents a 600w HPS on 12/12, the second row a 200w T5 on 18/6, and the third row also a 200w T5 on 18/6. If there is no overlap whatsoever, then no more than one T5 will ever be on when the HPS is also on. This means no more than 800w would ever be on the circuit at any one time. If the timers drift slightly out of sync, there could be a brief spike in power usage to 1000w - that is, 600w + 200w + 200w... and trip the power.
 

Druzil

Member
I see what you are saying. 1000W should not flip the breaker. I run a space heater constantly which packs 900-1200w by itself. Even when my 400W HPS is running is 1300-1600W, I've never flipped a breaker. Perhaps, though, run an extension cord to a plug on another circuit with a timer there. All I can think. Splitting your power to different circuits will help save on electric bill also. If you run that watts on one circuit, it's using more electricity than running off separate circuits. I did this with appliances; made sure they were evenly split throughout breaker box, and saved nearly 25% on my bill.
 
save yourself some money, go with the mechanical ones at lowes or home depot. Much more reliable.....
If you havent tripped a breaker on all that stuff on one circuit something is wired wrong and you are in danger of starting a fire....
The maximum on a normal is about 1500 watts.
 

purklize

Active Member
Yeah, I added it all up and it came to around 1500w. It's a 15 amp circuit so it can support up to 1800w, but I give it headroom in case of surges. When my wife plugged in a hair dryer on top of everything else it tripped the power instantly (this was before we realized almost the whole place was on one circuit).
 
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