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@nanomonkey

What do you guys do with your extra electricity when your batteries are full? I have a 12v ARB compressor that I was thinking about filling up an air tank when everything is topped off, which I can use for running air tools. I also thought about heating water or melting metal :)

I've seen some charge controllers for wind turbines that have a dump load, but the charge controller for my batteries doesn't have any sort of connectors, so I guess I'll have to set up a relay that is turned on when the batteries reach a certain voltage.

@neftaly

Dehumidifer 🐳

@Dominic

I just relax and stop worrying about power ;)

@nanomonkey

@neftaly How drinkable is the water that comes off of a dehumidifier? And how much power does it draw? I love the idea of pulling water from the air with excess power. It's been 50-65% humidity here lately, but no rain, so the soil around my plants is constantly dry, but there is some water in the air that could possibly be harvested.

@nanomonkey

So, it appears that the manufacturers don't think it's safe due to bacterial contamination and metal content, but combined with a good filter, or a system made from better components combined with a uv germicide light and you might get somewhere.

@neftaly

I'd be concerned about things like Legionella, and only use it for non-potable water and/or grey water. What about using overage to pump water from a well into an above-ground tank?

@joeyh

Pumping to a water tank is in my medium-term plans. Once I have a thousand gallons or two up in the hills behind the house, I'll do gravity flow water, and finally get running water here.

More immediately I am still working on early stages of my "cold battery" concept; eg finding a chest freezer that won't overload my power system on startup. And deciding what voltages to configure my old Xantrex PWM (converted to a load controller) to divert power to it at.

@nichoth

I saw this video where they use an arduino to control a refrigerator that runs off of solar power, so you have compete control over how much the fridge operates. It sounds like you might be doing something more complex though, where you need a minimum amount of power available in the battery in order to get the fridge down to temperature.
https://youtu.be/dfqunEuw61k?t=234

@Dominic

thinking about this again, to be truly of the times and maximum #seasteading the dump load should be a bitcoin miner.

@nanomonkey

Weird, after writing about this I started looking into a bitcoin mining as a dump load. I doubt you'd want to turn off dedicated asics, unless your batteries were getting low, or you knew you were going to be in incremental weather. I guess if you had a good size server with multiple gpus that were mostly idle (ie not being used by you at the time) you could spin up miners to bleed off the extra power. Sadly, doesn't bitcoin mining require an internet connection also?

@nanomonkey

It seems to me that water generation would be your next step. It looks like most of the desalinators are expensive and loud, so possible an air water generator would be more pleasant and cost effective.

@ktorn

If you're gonna mine with solar power, you might as well choose a proof-of-stake coin and use a Raspberry Pi for it.

Like these guys are planning to do! :)

@Dominic

@nanomonkey it does, but if you are in a mining pool, it only requires the reception of one hash every 10 minutes, and to send you best nonce, so it's very lightweight. Though, the trend is towards a faster block time now.

@ktorn WIND

Wind generators on freefloating offshore platforms! They could drift where the wind is the strongest (southern ocean, also, very little shipping to run afoul of) you'd just have to defend your bitcoin mine from other seaseaders, aka pirates.

@Dominic

what if you had second-hard miners that are not competititve any more, but might still be worthwhile if you are getting free energy?

(which is not the case if you are buying bunch of wind turbines especially for this, but is if it's just a dump load on your home setup)

@ktorn

@dominic but would it make enough revenue to pay for the satellite data?

I have one of these waterproof rugged USB satellite modems, which would be great for offshore platforms (I actually got it for a unmanned boat project that it's now shelved ) and it's not cheap to send even an SMS worth of data.

@Dominic

@ktorn ya it's not cheap. What is cheap though is ssb, aka, Single Side Band radio. I didn't intend SecureScuttleButt to use the same acronym as Single Side Band, it just worked out.
It's free, you need expensive equipment, and a license to operate but then you can be sending ... emails ... on the high seas for basically for free. read more: https://sailmail.com/

I have a friend who's family's business is making artisanal harmfree marine mammal research equipment. Normally they'd have some sort of satellite uplink, but he was seriously thinking of meshing arduinos that then uploaded as soon as the dolphin pod came up for air within GSM range. (until he got frustrated working with his dad)

@Dominic

Oh yeah, the problem with SSB radio, is that it's really slow. like 300 bytes a second!

@nanomonkey

@Dominic Unfortunately you cannot do any encryption on SSB radio. Encoding is fine. I'm not familiar with bitcoin mining methodologies, are the messages between miners encrypted any way. Personally, I don't see how anyone gets anything useful done on SSB radio. Who would check their email if their login was made public? Or no HTTPS sites allow either?

@Trigger Warning

Who would check their email if their login was made public? Or no HTTPS sites allow either?

One time passwords, or challenge response login. (A hash shouldn't be considered "encrypted".) Of course, both of these could be used as a side channel, but steganography can do much better.

@Dominic

correct. cryptography for integrity, hashes and signatures, is legal. A mining pool has a centralized validator, which picks the block, then broadcasts the hash of that to the miners, you'd only need to authenticate the hash... oh but then you'd need to encrypt the nonce back to the pool. (otherwise it may be mitm'd)

@nanomonkey radio is fundamentally just shouting, so all other ssb communication is public too! You are not ment to conduct business over it either. Not sure how well these are enforced, and there is always steganography...

@joeyh

I wonder if sending an encrypted message to avoid MITM, followed soon after by publishing a key that allows decryption would be allowed on ham/SSB. It's not about secret communication then, and is arguably not much different than uploading a file in a format that's useless until the whole file has been transferred.

(But you don't need mining pools to mine cryptocurrency anyway, if your timescales are long enough.)

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@nanomonkey

@Dominic Speaking of steganography. I'm curious how many of the photos on scuttlebutt have hidden messages. When I was young I did some simple Least Significant Bit steganography on png files, but I reached a stumbling block with jpg's encoding. I'm sure its become much easier since then.

@nanomonkey

@jolyon I feel like hot water is more easily obtainable through solar hot water heaters. Evacuated tube water heaters are super efficient and relatively cheap. Generating or pumping heat should only be used when the sun is not an option.

That being said, electric water heater elements make great dump loads. I built an adjustable 30kW hot tub dump load for testing the outputs of a gasifier generator when we were testing how much extra power we could obtain by adding a turbo charger. They are especially nice because a 240V AC heating element can DC output too.

Looking at my own electrical energy usage, I easily spend the most on refrigeration of food. I'd love to find a DC option that didn't cost an arm and a leg.

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