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This would certainly make sense. My proposal was along the same lines earlier as a energy storage under the house. But the problem still remains: too much heat loss with the attempted high temperature sand solution.

Boosting 3.3v to 48v at 2kW is not trivial and there is no off the self solutions available. Up to 90% efficiency would be possible if someone like Vicor would be making these. (48v to 3.3v converter bricks are not that far from 3.3v to 48v converter) Having said that typical 150w Vicor module...

And gearing wont have effect on amps needed from battery, only how much the inverter has to handle. Model S Plaid pushing 2000 amps to motors from standstill requires only a small fraction of that current from batteries.

Quite many BMS's have overload protection but is any of these able/designed to handle short-circuit? How much delay and is there minimum/maximum tolerable wiring inductance? Yes, you can and should use fuses but there is still question which one reacts first and if the first device to respond...

Typically you get roughly same or somewhat higher amount of total amp-hours with shallower discharges as long as you avoid the extremes of the voltage range. So you can get 8000 100% DOD cycles, 16000 50% DOD cycles or 32000 25% DOD cycles. But you won't get 80 000 10% cycles in the upper range...

If one of the cells is low you probably better connect charger directly to that low cell. With some precautions it is even possible to power the charger from the same battery bank you are balancing. You need either isolated DC-DC power supply or run your inverter combined with adjustable...

Sounds reasonable for cheapo unit with no special attention paid to energy efficiency. Could be much better tho, for example https://www.idealo.de/preisvergleich/OffersOfProduct/201460147_-rb38a7b6as9-samsung.html 4 cu ft freezer and 9 cu ft fridge totalling 295 Wh per day or mere 12w average.

If you want to know currents of invidual batteries you just need to subtract last battery current from 2.nd last and so on. Or if you had enough long cables you could put both cables simultaneously trough the current clamp meter. Incoming and outgoing currents would cancel each other in the...

Resonant caps are the cheaper part and you need "only" 20pcs of them vs 40pcs output filter caps. NP0 doesn't need voltage derating like X7R needs so 50V NP0's might be ok. These are only something like 30 cents per piece...

Any of the color-coded &UL listed lugs look good to me. Panduit, Burndy, Thomas&Betts, ABB, Morris, AMP/TE are probably some of the names in US market. Here in Europe: Klauke, Elpress, Ouneva (and at least two standards, Swedish SEN in nordic countries and DIN)

Forgot to mention: belleville washers are also available in serrated version...

Instead of 3x 8S strings set your panels to 2 strings of 12 panels. Still within 18K voltage limits and you have the input 1 mppt free for future use?

Did you bother to read? Cases with support on both ends were for 12m beam making it similar-ish to 6 meter beam fixed from one end. Also the last link was for beam supported from one end. Mechanical engineer…

Sort of MacGyver solution but it is possible if nothing else is available and you are stuck in middle of Alaska. it will get really hot and in some cases explodes if you heat the pencil too quickly.

Your explanation of differences is good but I wanted to nit-pick about the transformer size vs current: Compared to high frequency design the low frequency transformer is large because of low frequency, not high currents. (Low frequency needs large core and lots of wire turns around it) Good...

Just babysitters getting fatique from spoon feeding.

AFAIK None of the inverters currently on the market are truly LF switching. Even all the heavy transformer ones are HF switching variety or what Victron calls hybrid HF. LF switching inverters are dinosaurs from prehistory, super heavy with lousy efficiency. Last ones have been available more...

https://www.aliexpress.com/item/32891427621.html Daly for example seem to specify 960 us delay for short-circuit protection. Or about 1 millisecond. Wiring inductance is slowing down the rate of change during short-circuit. Assuming 48v system with compact layout and 2 meter wiring length...

Peltiers are pretty horrible even for fridge use. Compressor system can easily have 300w cooling capacity with 100w power draw. Peltier system ends up really fast to situation where you need 300W of electricity for 100W cooling.

I'm not sure about terminology and this goes to maybe irrelevant nit-picking for this thread. But I would still call it feedforward as output current is not really the end goal (output voltage control is the "end goal") It is still open-loop "best guess" of the needed compensation unlike...

Losses on best ones are really low: Viessmann(Germany) 50 gallon WH needs only 33 watts or ~800Wh per day , equivalent to using 3 or 4 gallons of hot water.

Higher the better as panel shadow is blocking smaller part of visible background ”reflective” area (soil, snow, roof) Practicality is another matter.

Planar magnetics would be nice but probably another factor of 10 harder to source/make for DIY project. Or is there nowadays cheapo chinese shop where you could order prototype quantities of planar transformers cheaply? Cheap asian pcb manufacturers for example have been game changer in DIY...

Cheap modules are for cooling use and have limited max temperature. Proper TEG modules can withstand much higher temperatures. Something like 120 cel vs. 400cel. You can use the cooling modules also for generating power mut efficiency really sucks and its hard to generate enough electricity just...

I'll second the measurement question. Could be VA vs. W issue or number of other issues. What was the AC wattmeter used?