Recent content by MattiFin

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...

LFP going for <100usd/kwh this deal sounds crazy but maybe there is devil in the rebate details. Or they forgot to work out the details.. :ROFLMAO: We don't have anything as wild as the US marketing or rebate campaings in here. Like the pepsi-co Harrier fighter jet..

-- You could at least in theory also do the feedforward to reference voltage from the AC output current. Analog domain only, no need to get the AD-converters in the mess. But I also envision it as more unstable or prone to oscillations, especially if you over-compensate with the feedforward.

Isn't the DC bus voltage already one part of feedforward? DC bus current is just additional feedforward to compensate for I*R losses in transformers/wiring? As far as I can see both options have their positives and negatives: DC bus load current compensation: slower to react, compensates...

Why do think that it would be a problem? Wiring can handle it, the whole idea of gG fuse rating is that it can handle similar overload as the cable. Your BMS is already dead and your inverter is also dead, faster fuse won't bring them back. With really wishfull thinking your inverter could be...

400 kWh for december so pretty much in line with my numbers.

Suprisingly neat/clean construction. Balance wires going trough holes in the metal brackets would be a bit worrying if used in vibrating environment.

Cheapest battery on aliexpress is not a great start. There is no lower limit on what kind of crap they sell on aliexpress. Plenty of professional con-artists there that are good in convincing ali customer support that YOU are at fault. The seller and aliexpress itself is just going to spin you...

Most common gG NH fuse will handle about 4x nominal current for 10 seconds before blowing. Or abouts 5x nominal for 5 seconds. Not infinite number of overload cycles or when already loaded for maximum for hours(hot) 200A fuse should be plenty for 7kW inverter as it can handle 5s peaks up to 42kW

This seem to be good example how everything else than Qgd*Rdson goes to worse when moving from Optimos 3 generation to Optimos 5 https://www.infineon.com/dgdl/Infineon-IPP072N10N3_G-DS-v02_01-en.pdf?folderId=5546d4694909da4801490a07012f053b&fileId=db3a30432313ff5e012393bed2d20405...

For sure it is NOT rated for DC break at 400A. You better yank the handle really swiftly if you ever want to use it for breaking the circuit at DC.

https://onninen.pl/en/product/JEAN-MUELLER-Fuse-switch-disconnector-KETO-2-3-F-HT-400A-T200113002,266902

Looks really easy in most of the US compared to Europe, let alone the northern parts of Europe like Finland. :whistle: 30 kWp panel set in december: Alamosa, Colorado: 4100 kWh Helsinki, Finland 295 kWh (the most southern part..)

12v lugs seem to be on the other end of the inverter. Amp ”meter” seem to go up to 1200A and 1500W rating is for those wall outlets that are not rated for more than that anyways.

There is not any standard. Manufacturers make whatever people(companies) seem to be buying and what the manufacturers can gobble up. And invidual cell sizes have been going up as production is moving to larger silicon ingots. There is limited number of voltage options you can build from a number...