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How safe is it to use a SSR to control power to a spa? Or use a relay?

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DougSpindler:

--- Quote from: bdunham7 on July 20, 2020, 06:18:03 pm ---
--- Quote from: DougSpindler on July 20, 2020, 06:05:04 pm ---My error and I see a typo  The and should have been "an".

Fire insurance would be valid before and after an earthquake.  But if there is an earthquake and no fire and you don't have earthquake insurance then you are screwed.  But if you have earthquake damage followed by fire then you are covered with by the fire insurance.

--- End quote ---

Well, perhaps, unless you have announced your intent to commit arson in a public forum.  :-DD

--- End quote ---

I'll leave that to the protesters.  Have you seen the video of the looter who broke into a Dodge dealership and stole 80 brand new cars under BLM protesting?  These people are videoing themselves.  If my glass jar of gas falls and breaks as a result of an earthquake that's the way things go.  But now way, like these protesters, would I film it and put it on YouTube.  Total value of the new cars the protesters played bumper cars with and stole is about $5,000,000.







Bassman59:

--- Quote from: DougSpindler on July 19, 2020, 08:43:13 pm ---You are upset because I'm not buying from one of the two vendors you suggested?  My post was for advice on using an SSR vs a relay.  Did you even answer that question?   

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For what it's worth -- my previous house had a hot tub and it had SSRs for the heater and pump controls. I only know this because one of them failed and I replaced it with the exact model, which was sold by one of the local spa supply stores.

james_s:
My hot tub has mechanical contactors for everything. I'd say it depends on the frequency at which you want to switch it. SSRs will typically have higher losses and are more likely to fail shorted (closed) however they have the advantage of being immune to contact wear which can be an issue for frequent cycling.

NiHaoMike:

--- Quote from: james_s on July 21, 2020, 11:42:23 pm ---My hot tub has mechanical contactors for everything. I'd say it depends on the frequency at which you want to switch it. SSRs will typically have higher losses and are more likely to fail shorted (closed) however they have the advantage of being immune to contact wear which can be an issue for frequent cycling.

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SSRs excel at controlling heating elements although with the high thermal mass of the water, probably not going to make a huge difference. For heating air or small volumes of water, the difference is very substantial.

DougSpindler:
Take a look at my application.  I am on a Time of Use rate plan with my power company.  (Very common now in California.)  The cost I pay per kWhr changes 5 times in one day.  Depending on the time of day I might be paying as little as $0.13 kWhr and as much as $0.54 kWhr.  My goal is to not have the heater or pumps (cleaning cycle) run during the periods when I am paying more than $0.13 kWhr.

I was thinking of interrupting power to the heater and pump motors.  But then I thought it would be much easier just to place a high current relay or SSR to interrupt the mains to the hot tub.  To control the times relay or SSR would be energized I would use a smartplug.  In one year this would save me about $1,000 in electricity.  Total cost for parts?  Cost for parts...  around $80.00.

Or does someone have a better solution.  My questions is should I use a relay or SSR?

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