I have read about cooling tunnels. I can find it, however only in your neck of the woods (Ozz). What size tunnel would you need running 2 100 amp in parallel at about 50 amps. Where are they at retail?
Thanks!
SSR cooling tunnel ?
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SSR cooling tunnel ?
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Re: SSR cooling tunnel ?
https://www.jaycar.com.au/fan-assisted- ... g/p/HH8530 it actually comes as a single piece and cut it in half to give 2 bits that slide together to form the tunnel.
An 80mm fan has holes aligned to the 4 screw holes on top and you require a thermostat mounted above the relay on each side wired in parallel to start the fan when the relay gets above 50*C.
Finished article looks something like this in an install I did around 12 mths back for Peter Holmes (Pet-els)
T1 Terry
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Re: SSR cooling tunnel ?
Well hello Mr Grizzman, where and what have you been up to if that isn't toooooo personal 

Queen of the Banal & OT chatter and proud of it. If it offends you then tough titty titty bang bang.
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Re: SSR cooling tunnel ?
I'll passing the credit or otherwise to Margaret, my photography suffers from my shakes so an in focus photo is a rare event, and the ability to actually get a smart phone to sense my touch leaves a lot to be desired just adding to the problems. For me to actually position anything correctly in frame, in focus and correctly oriented is a highly unlikely event so much easier to pass the job over to someone who can

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Re: SSR cooling tunnel ?
heres mine
NOT tried in anger so far.
50mm square aluminium tube about 900 high (whatever suits) with some thicker ally under the heatsink, glued with heat transfer stuff. SSR(s) bolted to the side, tiny 40mm jaycar fan on top running through a 50 degree thermostat.
Cannot ever imagine the fan actually running but we will see. cannot fail really
NOT tried in anger so far.
50mm square aluminium tube about 900 high (whatever suits) with some thicker ally under the heatsink, glued with heat transfer stuff. SSR(s) bolted to the side, tiny 40mm jaycar fan on top running through a 50 degree thermostat.
Cannot ever imagine the fan actually running but we will see. cannot fail really
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Re: SSR cooling tunnel ?
Thanks Terry. That was what I was looking for. I found one that was 80mm x 80mm x 80mm. I felt it was a bit small.T1 Terry wrote: ↑Tue Feb 20, 2018 3:45 pmhttps://www.jaycar.com.au/fan-assisted- ... g/p/HH8530 it actually comes as a single piece and cut it in half to give 2 bits that slide together to form the tunnel.
An 80mm fan has holes aligned to the 4 screw holes on top and you require a thermostat mounted above the relay on each side wired in parallel to start the fan when the relay gets above 50*C.
Finished article looks something like this in an install I did around 12 mths back for Peter Holmes (Pet-els)
Heatsink 1.jpg
Heatsink 2.jpg
T1 Terry
2019 F150 Ecoboost SuperCrew
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150 AH Lifepo4 3P4S 208AH CG2 hybrid system
Boondocking is my game
"If you are not learning, you are dying"
2016 Rockwood Mini Lite 2504S Trailer
640 Watts solar ElectroDacus SBMS0 3 DSSR20 (TS60 backup)
150 AH Lifepo4 3P4S 208AH CG2 hybrid system
Boondocking is my game
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Re: SSR cooling tunnel ?
Hi ya Dot! Are you sure ya wanna hear the soap opera ? Well let's see making a house into a home,21st anniversary in Vegas , mom in the Hospital and now in rehab and will be going in assisted care center. Alzheimer and dementia sucks. On the brighter side the younger grand kids we took tubing and the older ones doing/snow bording. Oh ya I put on skates and in about 5 feet, I fell giving me a concussion. One CT scan later and a weekend to recover all is well.
Well YOU asked
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Re: SSR cooling tunnel ?
Thanks I have considered building one also.bagmaker wrote: ↑Thu Feb 22, 2018 8:41 pm heres mine
NOT tried in anger so far.
50mm square aluminium tube about 900 high (whatever suits) with some thicker ally under the heatsink, glued with heat transfer stuff. SSR(s) bolted to the side, tiny 40mm jaycar fan on top running through a 50 degree thermostat.
Cannot ever imagine the fan actually running but we will see.
SSR on heatsink (2).jpg
cannot fail really
2019 F150 Ecoboost SuperCrew
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150 AH Lifepo4 3P4S 208AH CG2 hybrid system
Boondocking is my game
"If you are not learning, you are dying"
2016 Rockwood Mini Lite 2504S Trailer
640 Watts solar ElectroDacus SBMS0 3 DSSR20 (TS60 backup)
150 AH Lifepo4 3P4S 208AH CG2 hybrid system
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"If you are not learning, you are dying"
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Re: SSR cooling tunnel ?
The ones we make up to suit 2 relays are 85mm x 85mm x 85mm and this puts the screw holes at each end perfectly placed to mount the 80mm fan screw holes.
The relays themselves are 60mm long and 45mm wide, mounted across the heatsink so the heat dispersing fins inside the tunnel are under the relay base and the thermostat mounted above between the relay and fan ends up as a neat package. Not sure how you would mount the fan on the end with a 5mm smaller cube, but if it has the same amount of fins inside each half I guess it would work ok.
Don't be fooled by the area required for cooling when one of these relays gets into rapid PWM control, even the good quality low voltage drop relays will have the fan running at a 50% duty cycle passing 100 amps through it via 2 relays rated at 100 amps each. Push the load current higher and the duty cycle drops to 75% fan on at a 140 amp load and 100% duty cycle (doesn't turn off) above 80 amps per relay. If you use the cheap chinese relays that you find on evil bay, even at a 50 amp load (25 amps per relay) the fan can not keep the heatsink cool enough for the thermostat to drop out. Be warned also, those cheap chinese relays don't just fail if the get over heated, they have been known to catch fire, so be very careful with just what product you use.
T1 Terry
A person may fail many times, they only become a failure when they blame someone else John Burrows
Those who struggle to become a leader, rarely know a clear direction forward for anyone but themselves
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