Would anyone like to chime in. I recently made an MOT spot welder for 18650 nickel strips. I can reliably weld 0.2mm nickel. Although I do need a slit if I’m doing nickel nickel (stacking for more amps)....
OK this is interesting, but also differs. If I have read correctly, you’re circulating the water in the system as a whole.
I’m also using a solar setup, but I’m using a serpentine coil running a separate coolant liquid. The coolant is used since winter goes from -10 to minimim -20 degrees celsius.
Hmm, the heater element being controller disregarding your will is a bit of a bummer.
Thanks for clarifying, so you are indeed circulating the water itself, it’s not a separate line used as a heater. In this case you really are at the mercy of either your pump, pipe length, ambient temperature, insulation and/or sun intensity.
Have you monitored the temperature at the panel on the roof itself? Also, what type of insulation are you running on those pipes?
Yeah, that seems like a good way to go. 65 degrees at ground level is what I’d also expect. My assumption up top would be close to 90/95 degrees. Driving the pump more often would be interesting.
do you find it difficult to get into games? I’ve got Epic Games and Steam Games libraries chock-full of classic top-tier games along with many other newer games like Stray or 2077, and a bunch of indie titles. I just can’t be bothered to download and install them, much less try to get into the characters and storylines. Used...
I rarely play alone anymore. Which makes it even more difficult as you get older. It’s hard to match up with other people when life keeps them equally busy.
I’ve also noticed that I want a new experience from my games, kind of like searching for that new movie. Games rich in their story and yet not that distracted in side quests seem to keep me going. God of War was ideal, Horizon too. Baldurs Gate 3 had me for a while, but most online titles suck the time out of me at almost no return.
Hi, I have built a microvawe transformer spotwelder, I have put a single turn of welder wire for in the secondary and I’m timing it with arduino. Worth mentioning it was/is a 230V transformer. Electrodes are sharpened copper rods. I believe the voltage is still high. The spotwelds it produces are slightly discolored and not as...
I went down this road just as you. I found out that most MOTs are rather weak for 18650 nickel strips.
You need a transformer rated around 1500 watts. Most are 700-900 watts. I ended up wiring 2 transformers in parallel. Also, make sure to remove the transformer’s shunts. They are a form of current limiting and will impact your amps at the end.
Finally, make sure to carefully regulate your pressure with the copper tips. High pressure does indeed equal a weaker weld.
AC in general is also not the best for very short pulses of welds. I have found that 40-60ms work best for 0.2 with around 1000amps. Anything less didn’t weld tbh and the MOT couldn’t pull amps fast enough. I tried all sorts of windings and cable thicknesses. I finally chose 6AWG and I’m happy enough with 2 transformers.
What's your solder of choice? (images2.imgbox.com)
I recently came to the realization that I’ve been kinda punishing myself with cheap no-name solder that is really difficult to work with....
MOT spot welder / discussion (discuss.tchncs.de)
Would anyone like to chime in. I recently made an MOT spot welder for 18650 nickel strips. I can reliably weld 0.2mm nickel. Although I do need a slit if I’m doing nickel nickel (stacking for more amps)....
My customisable solar hot water system controller (project in progress)
Hi all,...
Gamers who have gamed for a long time
do you find it difficult to get into games? I’ve got Epic Games and Steam Games libraries chock-full of classic top-tier games along with many other newer games like Stray or 2077, and a bunch of indie titles. I just can’t be bothered to download and install them, much less try to get into the characters and storylines. Used...
Microvawe transformer spotwelder. Is there a way to improve it?
Hi, I have built a microvawe transformer spotwelder, I have put a single turn of welder wire for in the secondary and I’m timing it with arduino. Worth mentioning it was/is a 230V transformer. Electrodes are sharpened copper rods. I believe the voltage is still high. The spotwelds it produces are slightly discolored and not as...