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Alex
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Replying to Avatar rev.hodl

Adventures in heating water with a Bitcoin miner

https://v.nostr.build/kRBrsoMNes5flVCR.mp4

I've been working on my own version of a Bitcoin mining hot water heater over the past few weeks, taking lots of inspiration from many fellow plebs who already have working setups. When it comes to Bitcoin mining heat applications at home, there is rarely a cost effective plug and play solution. I find myself building my own diy solutions but that often comes with some trial and error. Here is nostr:nprofile1qqsdt2hwqafxd3fn5nyf9rucka8c3qy6w72fru4fva0xyh596mxtt6qpz9mhxue69uhkummnw3ezuamfdejj778nygn amazing setup:

nostr:nevent1qqszhyu6mrkr8vjcw8teaha5jqnyxfw6k5g3p57pszhqtwav3yd8gyc37t8al

If you haven't seen it already, my first experiment in immersion mining was to preheat maple sap using mostly equipment and components I already had plus some canola oil for the dielectric fluid.

nostr:nevent1qqszjqlg2g0h65rd968y0sjsu9tfmuahg6j5gcg43yexd099efsdjyqydfsau

Taking that experience along with the favorable prices of the s19 miners, I decided to see if I could build something to heat all the hot water at the homestead.

I always approach the design of my systems utilizing permaculture to guide me which often means my initial implementations look makeshift and messy.

There are a few key principles I'm leaning on in this hot water heater build. First is small and slow solutions, I want the hot water heater to be able to function normally if things don't work out, I want to have a minimal investment in the components for the same reason. This leads to the principles produce no waste and use/value renewable resources, basically I wanted to use stuff I already had. Using heat productively from Bitcoin mining naturally utilizes the integrate rather than segregate permaculture principle.

The design utilizes the side arm recirculation technique, which takes cold water out of the drain port of the tank and returns heated water to the top of the tank through the pressure relief port. The recirculation loop of the hot water tank is driven by a cheap pump through a plate heat exchanger.

On the Bitcoin mining side of the hot water system, an s19 is placed vertically in a 10 gallon plastic cooler immersed in 8 gallons of canola oil. There are two fans in the intake side of the miner at the bottom of the cooler and I tried to keep the control board and PSU out of the oil (less to clean up if it didn't work). There is some pex pipe drawing hot oil off the top of the tank driven by an identical pump as the hot water side of the loop. The hot oil passes through the plate heat exchanger in an opposing flow as the water. The cooled oil is returned to the bottom of the cooler through the hole where the water spigot was.

I've done a few initial trials of the system and it works! However, the biggest downside is that after heavy water usage like drawing a bath, it takes a few hours for the water to get back up to the top temperature. I think the slow recovery time is due to the size of the plate heat exchanger. The miner can put out heat more quickly than it can be exchanged into the water so I'm finding I have to keep the miner running at a lower wattage to avoid overheating.

I'm currently using the 220v circuit to power a miner to heat the house so I have to modify the power supply of the hot water system to run on 110v before I can continue dialing it in. In the meantime, I could resist sharing my progress.

#permaculture #homesteading #permies #meshtadel #bitcoin #bitcoinmining #plebminer #homemining

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Good stuff man!!

They can “financial rescue” to the list once this dip clears out

Replying to Avatar Sjors Provoost

More generally, I agree with James' observation that Bitcoin Core devs are paying much less attention to soft forks than they used to.

I can only speak for myself here. Part of the problem is that the current proposals don't excite me, yet. That's even after spending time at the op_next conference.

SegWit (which happened before I was involved) brought the promise of Lightning. Taproot lets you build cold storage with hidden fallback options.

I'm still waiting for MuSig2 to finally have broad adoption, something that's higher on my review list than new soft forks, and I barely get to it.

In that light, talk of a vault soft fork seems premature. The tool development is too far behind even for forks that already activated.

Similarly congestion control doesn't excite me. I'm general I'm skeptical of claims that the masses are suddenly going to self-custody because of a dramatic event in US politics. Especially given that plenty of other countries are in worse shape and we don't see self custody blossom at a scale where it causes congestion. The US is 5% of the world population.

That's not to say that I'm against these ideas. If I see other people work on and activate them in a competent and careful manner I might be fine with it. It's sad that their main proponents and developers burned out, and that certainly won't speed things up. Maybe grants tailored for potential soft fork devs can help here, as long as the right expectations are set.

But not being opposed does not reach the bar of me actively reviewing it, which is part of what pushes things forward.

If I see a more fleshed out design for a (BitVM powered?) sidechain with unilateral (no 1 of N nonsense) exit that gives me full privacy (Shielded CSV?), that would get me more excited. Especially if it's clear which specific opcodes are best to get there.

Other devs will have other things and other thresholds that get them out of their soft-fork winter sleep. There's a "I know it when I see it" aspect to this too.

All that said, it might be the case that one day every single core dev is excited about a soft fork proposal, or would be if they read enough about it, yet is too distracted by their day to day focus. But I'm not sure if that is really what's happening. nostr:note1579fauj8nwl38mvzle5fkupswjw6fkzqv4syupav8ckshujy24tsks9y3h

James’s observation uses cognitive dissonance. He’s saying everyone needs to self custody at high fees and at the same time that we should switch to receiver-pays-for-shipping soft fork. The two thoughts are at odds with each other. Datapoint for this is Rusty’s points on Nostr.

You want Apple to pay? As in “single payer healthcare”?

Replying to Avatar rev.hodl

S9 hashing on direct DC solar and AC PSU hybrid system

https://v.nostr.build/ZF3imFr3BxzP6Y7u.mp4

Here I have an S9 powdered both by the 12v DC output of a solar charge mppt controller and the output of an apw3++ plugged into an inverter. The output of the solar charge controller is wired directly to DC output lugs of the PSU. As the clouds roll by the output of the solar power decreases and the PSU delivers more power from the inverter. This same technique can be used by plugging the PSU into a grid powered outlet instead of the inverter. It's basically a way to subsidize the power consumption of a miner with solar power directly. It's pretty cool to watch.

#bitcoin #bitcoinmining #plebminer #homemining #offgridmining #solarmining #offgrid#solarpower

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You hit the nail on the head. For the latest bitaxe 5v miners, dc-dc will be the way to go. A few dc-dc converters is simpler than going thru an inverter.