It looks like the trend is a lot more people trying to build ATS systems, which is great.
Unfortunately, that means more chances of problems, and it also appears to be drawing more people that are less DIY-savvy.
Basically, I see a lot of designs that seriously scare me. Like chance of death scary.
I may not be an ATS expert, but I do have 25+ years experience as an electrical engineer. So this is not some alarmist rant.
There are really 3 issues combining to make a scary situation:
1) A lot of things can go wrong with a DIY design, such that you could get zapped.
2) Since a lot of this is done as an experiment, cheap and quick is a very common approach, often equaling unsafe.
3) Perception of 120V is you get a nasty shock. But add saltwater, and it gets a lot more serious.
In fact, the recommendation of a "simple bucket ATS" itself might need some rethinking.
That is the most potentially unsafe design of all.
Sure, if done carefully and correctly, it could be fine. And yes, even if done wrong, it would take some bad luck to get fried.
But take some cheap wall-mart lights on an extension cord, throw it together quick, wait a few months for
some nice salt accumulation and corrosion, get careless when cleaning, and you have one less member on this site.
I would respectfully ask SM/Worley to please think about putting some note on the dangers and safety prominently on the FAQ page.
Preferably with its own topic, almost line 1. Yes, there is some good info there, but it is buried, and not well emphasized.
BTW, with the sale of the SM100, you might want to be worried about personal liability as well.
Another more controversial concept to reconsider is what types of designs to push for/against.
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What can go wrong?
A) Everything will get wet.
With an ATS, and all that water moving, expect very high humidity, even in an open box. Everything will get condensation.
So when those lights click on, the bulbs, wires, reflectors, box, everything will probably be quite wet.
B) Salt creep
Even dry salt creep conducts. But combine that with condensation, and it means that not only is everything soaking wet,
it is probably soaking wet with highly conductive salt water.
C) Dangerous voltages and currents.
Sure, 120V is dangerous. But some ballasts, especially instant-start types, seriously increase that, to several hundred volts.
It gets worse: There are capacitors and chokes(inductors) in various ballast types.
These can keep the power going when you get zapped. So don't expect that GFCI to help.
D) Dangerous assumptions.
I bet people think outdoor rated lights are safe. - WRONG.
Outdoor lights are certainly far better. But most are not waterproof, only water resistant!
And specifically, they are not airtight against humidity.
E) Great chance of a current loop.
So you pick up that nice salt-water wet pipe on your screen in one hand, which is a great ground.
And you touch a light with your other hand where there is a bit of salt creep to a nice power source.
You now have a very nice complete electrical circuit, with your torso (heart) in the middle.
Dead meat, not just a little jolt.
F) Maintenance and mistakes.
Sure, you think you sealed that light with silicone. But that degrades, especially under high lighting. And it is easy to miss a small spot.
Same with sealing your wiring connections.
And even worse, you are trusting the bulb/ballast manufacturer. Made in china? Never any mistakes there.
G) Lack of care in the design.
Did you seal your lighting (bulb + ballast + socket) and ALL your wiring connections?
Do you have a GFCI?
Do you have a real earth ground line connected to lights, reflectors, and everything?
Do you even know of all the places where it could fail? I don't.
H) A GFCI may not help
It likely will, and definitely should be included in ALL designs.
And if it does trip, seriously spend some time figuring out why before turning it back on.
But they work by detecting and imbalance in current between line and return (hot / neutral).
So it detects and stops a short between line and earth-ground, not between line and neutral.
Also, is it away from the humidity? Did you ever test it?
Key safety checklist:
1) Include and test GFCI.
2) Use quality outdoor lights, preferably truly sealed.
3) Use silicone to seal lights, wiring, everything.
4) Always turn off lights when cleaning or even touching ATS.
5) Make sure there is an earth ground on all metal components.
6) Never have lighting inside an enclosed container with the running water
7) Consider one of those titanium earth-ground aquarium probes.
Hopefully others can contribute safety ideas as well.