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    Simple modular UPS

    How often does this occur? You can use a standard UPS for this with a much larger battery. The only downfall is the long recharge time. A common thing I'd do for over a decade is to get a large 12v or 24v UPS and then use a car battery on it. You'd have to look at float voltages to see if...
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    100+a 12v BMS with programable heater - Options?

    I'm looking for options on 100+ amp 12v BMS that's got heating capability and other options. I haven't been too impressed with what I've found. Any suggestions, or possibly a manufacturer that could tailor one to my needs? Thanks guys
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    WOW -- Ultimate boat config on sailing yacht

    This setup is beautifully done! 48v victron system w/ 2 hybrid motor generators + diesel motor. 120v 60hz and 230v 50hz inverters and chargers for universal shore power connection.
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    48V battery short circuit damage?

    The battery likely didn't even notice. The bolts / other hardware I'd bet is missing some metal. With a quick short like that, the metal turned to plasma rather quickly. Here's a paper with more info than you'd ever think to ask...
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    REPT 280Ah grade B from 18650Batterystore test result

    Pics of batts in 4pk boxes and BMSs in non-descript boxes with random other part boxes laying around? These boxes are as plain and bland as any other :D The MME is, well it's the MME. Most vids on the GTPE are what it is. I beat on it pretty good, it doesn't complain. 18650 is half a mile...
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    REPT 280Ah grade B from 18650Batterystore test result

    I drove to 18650 and filled up the mach e full of cells -- still haven't gotten around to using everything I picked up. Picked up all sorts of stuff, haven't played with any of it yet. Going to start tonight.
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    Stray voltage on the system -- re: YT vid.

    Hey @Will Prowse I think it's time you come up with an SOP for trying out new products. Unlike AC which will zzzap you, HVDC can cause your muscles to contract forcing you into the electrocution hazard and you're toast. Glad to see you're still around after that, that could have been really...
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    REPT 280Ah grade B from 18650Batterystore test result

    The problem with this is you just have no idea what the cells have already been through. Coming from china, they'll sell grade B as "A NEW" -- no telling what grade Bs actually are. Just too many variables. Reputable supplier w/ ease of swap if there's an issue is the way to go. You'll get...
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    How do DIY folks deal with NEC 690.4 (C) - Qualified Persons Only

    With the political nonsense of the late 20teens, I was making memes that others were getting account locks for sharing (FB). If accounts were numbered sequentially, mine would be right around the 10k mark (as in one of the first 10k on the platform). If I flagged a spam account, it was taken...
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    How do DIY folks deal with NEC 690.4 (C) - Qualified Persons Only

    The craziness of things is just beginning. Companies now offer AI analysis of satellite data that will then compare homes and their upgrades against permit DBs. France just used this to find another $10mil in taxes...
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    How do DIY folks deal with NEC 690.4 (C) - Qualified Persons Only

    GA It's extremely stupid for any permitting office to not allow a home owner to pull their own permits. It doesn't stop home owners, it just FORCES them to act 'un-inspected'. Very shortsighted of them to say the least.
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    How do DIY folks deal with NEC 690.4 (C) - Qualified Persons Only

    Same -- anyone can pull their own permits and complete the work here.
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    EG4 8kW Hybrid Inverter | 8000W Output | 12000W PV - $2,799.00

    Schneider has a large support structure in all major countries, and a quality / capability track record to boot. EG4 rebrands generic mass-produced chinese inverters that don't come anywhere close.
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    How do DIY folks deal with NEC 690.4 (C) - Qualified Persons Only

    The issue is that to get licenses in some states they require you to have several years in the profession. As such you'd have zero means of actually making someone 'certified'. If it weren't for having to prove years under a company for certain licenses, I'd get them just to have them out of...
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    How do DIY folks deal with NEC 690.4 (C) - Qualified Persons Only

    Unfortunately that's one of those situations where they'd bully you while not having a legal leg to stand on. Taking them to court would end up more expensive than borrowing someone's license. I ran into a warranty issue for a $14k mits minisplit in that the warranty was much longer w/ a...
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    How do DIY folks deal with NEC 690.4 (C) - Qualified Persons Only

    Qualified and licensed are not synonymous.... Are you qualified to bake a cake? What makes you qualified to bake a cake, or cook on a grill?
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    How do DIY folks deal with NEC 690.4 (C) - Qualified Persons Only

    It comes down to your jurisdiction. As far as I'm aware, it'd be a steep slope for them to try and say a homeowner cannot perform their own work so long as it's permitted and inspected. Part of 'doing your own work' is showing the system design / specifications. Don't expect to just slap a...
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    EG4 8kW Hybrid Inverter | 8000W Output | 12000W PV - $2,799.00

    Sorry, EG4 is trying to play in a price class they have no business being in. The XW Pro 6.8kw is a far better piece of kit.
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    High Current (100A+) Alternator charging?

    It actually outputs 40kW at idle (forscan verified) -- it's a 35kW motor, but 40kW generator. I've been compiling data on it to get a full understanding of its logic. Turbos aren't used at idle, it's still drawing vacuum while generating.
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    High Current (100A+) Alternator charging?

    We're in the process of retrofitting an RV (06 jayco on ford F450 gasoline chassis) and are going to run a 48v solar / inverter setup with LFP batteries. The 'secondary' power solution is an alternator (2nd, dedicated unit) that will drive off of the truck's main belt and do just under 5kW up...
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    Destroyed $4K of alternator & regulator with a good Fuse

    Oh man, was chasing down gremlins with an FJ cruiser -- alternator fuse was bad but would test good. In order to change the fuse, the whole electrical fuse box had to come out. Did everything I could to avoid trying to do that, but that was it. Even looked okay as well.
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    Bonding / Grounding, Will's 13kW System, and my Youtube Community Ban

    Which is by definition, the exception, not the rule. Tax "credits" while filing US income taxes has nothing to do with the cautions outlined in my original post. The best advice regarding crypto is to just not talk about it. Nothing prevents someone from having multiple wallets to dedicate a...
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    Bonding / Grounding, Will's 13kW System, and my Youtube Community Ban

    You are misinformed. You could have done a simple search and found this out. US citizenship includes an unshakeable tax liability that follows you no matter where you reside in the world, no matter where the money you make comes from. The only way to break this is to renounce your US...
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    Bonding / Grounding, Will's 13kW System, and my Youtube Community Ban

    It's a bit more common than you'd think. Any antenna whose base is grounded / part of its attachment and is attached to a metal object, and is interconnected with coax, is grounded both at the antenna and again at the receiver. A lot of aerials are connected like this. Here is some great...
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    Bonding / Grounding, Will's 13kW System, and my Youtube Community Ban

    This information is mostly correct, and somewhat outdated. I deal with grounding communication towers among other things -- we use dozens of ground rods at times, sometimes more. There's literally a book on the topic --- motorola R56. We get some nasty lightning. The most dangerous is a pop...
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    Bonding / Grounding, Will's 13kW System, and my Youtube Community Ban

    Of course, but most people aren't doing fully loaded circuits with 24/7 loads for months at a time. A 15a load on 120v 24/7 is 43kwh per day, 1,300 kwh / month. That's more than the average home's power usage. The average person doesn't think about that at all -- it's just not something...
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    Destroyed $4K of alternator & regulator with a good Fuse

    The resistors were suggested as a means to possibly charge / discharge the system based upon the wiring diagram which isn't posted and the charging portion would need to be done manually -- this could be done by a simple switch / relay that allows you to charge before connection. If your...
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    Bonding / Grounding, Will's 13kW System, and my Youtube Community Ban

    There's also several fires that we've seen as a result --- I've seen at least 10 fires because people fail to follow proper loading for circuits and connectors.
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    Pumped hydro, the real issues....

    Sea water is a whole other animal to deal with.
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    Pumped hydro, the real issues....

    Per the AMA, the big issue with pumped hydro is you need a good 150m+ worth of head and a big ass area to store a lake worth of water. The larger the elevation, the less water is needed per given unit of power. It's not practical on a small scale. You also need a lake's worth of water to move...
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    Chassis Ground Location?

    Separate issue -- is that battery bolted down? It'd make one hell of a deadly projectile in a collision.
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    Destroyed $4K of alternator & regulator with a good Fuse

    What's the ramp-down time on the alternator? Consider an array of the slightly larger than D cell super capacitors in series to handle up to 60v. It's enough resistance and headroom to let it regulate down before over-volting. Easy to throw together a couple relays and resistors to charge /...
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    Bonding / Grounding, Will's 13kW System, and my Youtube Community Ban

    I didn't see a dedicated post regarding your GPU miners. Your 2 GPUs should be pulling 350w at most plus another 20w for the mobo (plus PSU inefficiencies -- run it on 240v for ~5% better efficiency). The reason there's a lot of videos on mining rigs is because most people aren't that...
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    Solar inverter for server UPS

    Yes, they should run 240v there too if not already. I run my computer equipment in my home at 240v --- everything from TVs to computers to phone chargers will work on 90-250v at 47-63hz (assume nothing, read the label). Higher efficiency at the higher voltage. 240v plugs have the 2 narrow...
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    (SOLVED) Solving the climate control crises

    No, you don't need that level of filtration. Zero water's filtration level is plenty -- I use britta activated carbon filtered water. The moisture in your air is not 'just' moisture. It's got all kinds of things in it, the AC unit itself also has dust and pollen in it (we've got red clay...
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