I like the idea or the concept to be honest. It works like a bank right? But, this once has a lock-in period only to force someone to hold for many more years. We know that hodling for a long time is one of the problems of the users because they lack of patience and they got easily tempted to sell when they see the market is doing good but I am only not sure if many people will trust such service.

Why will they entrust their coins to someone else especially on a new project that doesn't have enough reputation? why there is no service for hodling? I think that is because holding a coin is too simple, it does not need any advanced knowledge or complex tools but you just need a wallet.

Bitcoin is designed to be owned by us and make us our own bank without any third party interference. If you use the holding service, it is no different than you depositing your money in the bank. In addition to sending bitcoin to holding services will make it impossible for you to sell or use your bitcoin while your bitcoin deposit period has not ended, better hold your bitcoin and you can use them whenever you want.

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The APW8 that fits both T15 and S15 has an output voltage of 16.32V to 20.04V, and it costs about $100+ shipping, money wise I don't think it makes any sense to pay about 130-150 USD just to revive an old miner like the T15, it only does 23TH and consumes a good 1500-1600 watts, but that's the OP's call to make.

In my humble experience with these PSUs that Bitmain make, they are quite robust IMO, their PSUs have a lot more quality than the miners themselves, and I think I can say that at least 7-8 times out of 10 it's only a matter of PSU's fan replacement, and since you mentioned "several PSUs" I can only think that quite a good number of them only need a new fan, and those fans go for pretty cheap like $5-10, it's pretty easy to swap the PSU fan, you just need a screwdriver and a working PSU to test with.

Probably the best move after you've checked to see if the fans on the supplies are good and if swapping the supply makes a difference. Blown power supplies are usually caused by FET/IGBT issues and wind up blowing the small fuse on the AC end of the supply. If new ones are .02 btc I'd say go that way first.

Antminer boards tend not to short out the whole supply line, what usually happens is a chip goes bad but since it's one chip in 64/80 it just raises the voltage slightly on the rest of the chips and shuts down the board because the clock and spi signals don't flow through. You can quickly check by disconnecting the boards from the supply and see if it works. If it does check each board's power connections with a meter looking for 0 ohm resistance.

I would like to see the intermediate results of your experiment. More precisely, I wonder how efficiently your algorithm works, namely the selection of coins.
If you are still following this thread, then I ask you to give feedback or send me a personal message. Thanks.

How are you currently doing? You have posted that you have been obtaining profits with your investments but I suppose the last days have been harsh since the market has been crashing at a very fast speed, are you still applying the same strategy? From your original post you seemed to want to apply this strategy because we were in a bull market or at least we were experiencing a positive movement but now it is clear the correction we are experiencing is real, will you change your strategy?