National Homebrew Day Giveaway - Enter Now - Weekend Giveaway!

Home Brew Forums > Home Brewing Beer > Electric Brewing > Do I need a heatsink?
Reply
 
Thread Tools
Old 11-06-2010, 04:19 AM   #1
Dgonza9
Feedback Score: 0 reviews
Recipes 
 
Join Date: May 2010
Location: Evanston, Illinois
Posts: 1,183
Liked 10 Times on 10 Posts

Default Do I need a heatsink?

I'm piecing together a RIMS tub and control panel. I bought these parts.



I did not buy a heat sink. Do I need one? Or does the size of the SSR (40amps) mean it can handle the load?

Thanks guys.
__________________
On Tap: Belgian Barrel Aged Barleywine, Da Yooper's Oatmeal Stout, Breakfast Stout, Hop Your Face Off IIPA, Catcher in the Rye Saison, "Wino-head" Nelsin Sauvin Gumballhead.

Bourbon Barrel Duchesse De Bourgnone
Kegged:

Fermenting English Mild

on Deck: Lager?
Dgonza9 is offline
 
Reply With Quote
Old 11-06-2010, 04:47 AM   #2
Reelale
Feedback Score: 3 reviews
Recipes 
 
Join Date: Sep 2009
Posts: 17,736
Liked 1374 Times on 1332 Posts
Likes Given: 55

Default

Solid state relays are semiconductor devices that generate heat in proportion to the quantity of amps being switched. Heat sinks capture that thermal rise and dissipate it. It is important that you use a properly sized heat sink or else the SSR product will be permanently damaged.


Although you aren't pulling many amps, it's cheap insurance.
Reelale is offline
 
Reply With Quote
Old 11-06-2010, 04:53 AM   #3
Dgonza9
Feedback Score: 0 reviews
Recipes 
 
Join Date: May 2010
Location: Evanston, Illinois
Posts: 1,183
Liked 10 Times on 10 Posts

Default

Any way I could use the J2 relay output to power a small server fan? I have several around.
__________________
On Tap: Belgian Barrel Aged Barleywine, Da Yooper's Oatmeal Stout, Breakfast Stout, Hop Your Face Off IIPA, Catcher in the Rye Saison, "Wino-head" Nelsin Sauvin Gumballhead.

Bourbon Barrel Duchesse De Bourgnone
Kegged:

Fermenting English Mild

on Deck: Lager?
Dgonza9 is offline
 
Reply With Quote
Old 11-06-2010, 05:05 AM   #4
Reelale
Feedback Score: 3 reviews
Recipes 
 
Join Date: Sep 2009
Posts: 17,736
Liked 1374 Times on 1332 Posts
Likes Given: 55

Default

Anything over 4 amps really needs a heat sink.


With loads of less than 2-4 amperes, cooling by free flowing convection or forced air currents around the unit is usually sufficient. Loads greater than 4 Amps will require heat sinks. SSR units are to be mounted to some heat sinking metal surface, material heat conductivity should be kept in mind.
Reelale is offline
 
Reply With Quote
Old 11-06-2010, 01:30 PM   #5
jasonsbeer
Feedback Score: 0 reviews
Recipes 
 
Join Date: Jul 2009
Location: Central Iowa
Posts: 417
Liked 23 Times on 13 Posts
Likes Given: 9

Default

Heat sinks are recommended or you may shorten the life of your SSR. A fan will probably help, but I imagine it will not dissipate heat as well as a good heat sink with some heat sink compound in between it and the SSR.
__________________
There are a terrible lot of lies going around the world, and the worst of it is half of them are true.

Winston Churchill
jasonsbeer is offline
 
Reply With Quote
Old 11-06-2010, 02:11 PM   #6
passedpawn
Waste Allocation Load Lifter - Earth Class
HBT_MODERATOR.png
Feedback Score: 1 reviews
 
passedpawn's Avatar
Recipes 
 
Join Date: Apr 2009
Location: ☼ Clearwater, FL ☼
Posts: 21,080
Liked 4290 Times on 2615 Posts
Likes Given: 3693

Default

That AC SSR has a voltage drop of at least 1V. Times 10A, that's 10 watts of heat needing to be dissipated by the SSR. I'd say that definitely requires a heat sink.

[edit] just looked at datasheet, 1.6V drop. ~ 20W given off as heat. Needs heatsink.
__________________
- Andrew
passedpawn is offline
 
Reply With Quote
Old 11-06-2010, 06:33 PM   #7
Dgonza9
Feedback Score: 0 reviews
Recipes 
 
Join Date: May 2010
Location: Evanston, Illinois
Posts: 1,183
Liked 10 Times on 10 Posts

Default

I just ordered the heatsink. Shouldn't interfere with my plans to brew next weekend if I can get the control panel cutouts done. I think I finally have a handle on the wiring.

Thanks guys.
__________________
On Tap: Belgian Barrel Aged Barleywine, Da Yooper's Oatmeal Stout, Breakfast Stout, Hop Your Face Off IIPA, Catcher in the Rye Saison, "Wino-head" Nelsin Sauvin Gumballhead.

Bourbon Barrel Duchesse De Bourgnone
Kegged:

Fermenting English Mild

on Deck: Lager?
Dgonza9 is offline
 
Reply With Quote
Reply


Thread Tools



Forum Jump

Newest Threads

Og

LATEST SPONSOR DEALS