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So why aren't you using an open source Linux os?

https://www.zerohedge.com/commodities/lithium-prices-plummet-global-supply-concerns-diminish "battery-grade lithium carbonate in China has plunged from $84,500 per metric ton to $42,500, or about a 50% decline, according to Bloomberg data." This surplus is expected to last for years, hopefully...

In my search for an mppt I've come across 2 open source mppt's that I like,(unfortunately they can only handle <1000w, a bit small unless I use a lot of copper, but I prefer open source, being a Linux user, I find it superior to corporate), the 1st is a self build, a bit out of my depth, but...

Would this work? 300UH/25A, ? Description The magnetic ring is selected with an outer diameter of 47mm, an inner diameter of 24mm, a height of 18mm, and a magnetic permeability of 125 060 models. The 77438 and 77439 series of iron-silicon-aluminum magnetic ring inductors are selected, which...

AU$31.16 / lot (2 Pieces) Free postage High Power Inductor 100uH~1mH~5mH Grid-connected Inverter, PFC Coil Color: 100UH 30A 5MH 5A 4MH 8A 3MH 8A 2MH 10A 1MH 12A 700UH 15A 500UH 20A 300UH 25A 100UH 30A...

Actually I got the size wrong. I'm looking at Midea Aurora Plus Smart Inverter Heat Pump 2.5kW, Chinese, one of the biggest appliance & ac manufactures, they sell under a lot of brand names, its all still new to me. Its as small as they come & dirt cheap, I guess < $500 us. Its unlikely I'd use...

But if your paneling your home, you probably have heaps of space (different case for a yacht etc), I don't really see the gains in grabbing a few % in gains from an expensive mppt, when for the same extra cash you can add several more door size panels.

This isn't going to help much, but go to u.tube & check out "Off-Grid Garage" "Faulty" Victron MPPT cause major freak-out and chaos. And it smells funny Go to the 400 comments, as a guesstimate 50% are negative owners, of that ~ 80% are problems with auto updating software, ~20% relate to poor...

I'm in the same place, but only about several months in. Self build/ off grid etc. My original pv system was/is so simple, a few Sharp panels, a sealed lead acid, a pwm, some 10amp car fuses, & its never missed a beat. Perfect for led lighting, & a lap top. Got some money to burn, pv's are sooo...

Ok, thanks for your patience, I'll just post the 1st corrections below & work with your suggestions tomorrow. I'll replace the older version to avoid anyone using it.

Generally I'd only want to use the ac for a few hours midday - afternoon, & probably only for a few weeks over summer (when temp is >25c, 77F). Even in summer nights tend to be cooler (coastal climate). Plus my home is straw bale, with an 1" of cement plaster, so it stores & moderates the temp...

During the summer I really only need the power in the afternoon, when I'm home (1 person), I don't have a fridge as such (not big on animal products, but useful for storing apples from my trees over winter & cooling beer), so a very small chest freezer may be on my list if I can put the noisy...

Novice Note; Wasted a lot of time trying to id the voltage for a given capacitor on Easyeda parts search "JLCPCB assembled" function. The voltage is in code (on the part #), the code index didn't come up on a basic search. Most common parts available on "JLCPCB assembled" are made in China...

Awesome thanks. Close to finishing the 1st stage of 3 with easyeda, though pcbway is having a 50% Xmas discount on boards & added components. I think once you get familiar with the program it should only be a 10 minute job (stage 1), beginner ~ >10 hours.

Thanks so much, this may be what I'm looking for, but circuitry is new to me, so diffidently a challenge. It's going to take a while to digest. I'm upgrading a small, simple, reliable pwd system to 7.5 kw. I've come stuck over the last several months on the mppt's purchase. The cheap ones are...

Unfortunately they didn't stock those, just the 100v (6 cents each I think) & others. "So my panels are 38v in series of 3 = max 114v, so I should be able to use the same resistor values as you?"

Probably a dumb question, is that your BMS? & why is your fan so big?

So I guess what I should aim for is 2 strings, 1 of 8 panels & 1 of 9 panels. That was the combo I was going for in the commercial mppt's. 17 panels 2 strings.

Hi, just wondering if I need a diode for each string, between the (Battery or) Mppt & panels? I can see one on the (external part of the) circuit diagram, but not sure of its purpose.

kinda unrelated, but how good are these electric sit on mowers? I know Ryobi is a cheap brand but <3 years of battery life seems a bit poor. I have a large area to mow, looking at sit on (prefer robotic), seems like a no brainer to upgrade to an electric, any recommendations?

Amazon outside of the states is too expensive re postage. So Ali is my cheapest option, most of the brands mentioned above aren't available there. Having spent loads of time seeking teardowns reviews on utube, Below are the most recommended brands I found, all others on Ali seem utter junk...

So I'm onto my 2nd pcb, (seems better to lay out the tracks by hand, less error). But I'm not sure where to end the "large tracks". I have used <<<<>>> on the image below to denote large tracks. Do I need more large tracks, such as the Battery track? or more from the bucks or Earth? Thanks

Hi Warpspeed These came today, slowly getting there. What are the Mosfet's spec? & what is the diode spec? thanks

yeah it was on their list, hopefully its a real Texas, it's going to take some nights to get use to the program, lots of good video tutorials.. Prefers latest chrome or firefox, otherwise its clitchee to unusable.

So am I wrong in thinking that during the sunlight period & even if the pv are producing 1/2 their watts, say 3-4 kw - That alone won't power a 1200w ac? with a small batt to cover the start up surge of the ac motor?

This thread has been an interesting read, seems every step in contemporary pv's has issues. The mc4's seem ideal for isolating & testing & ease/speed. But how long will they last on a roof in all climates/temperature swings? what are the seals going to be like in 10 - 20 years? Neoprene &...

Hi, Panels are TW 415W 1085 x 1722mm (as big as a door), on a 15 degree steel roof. Area has v. high gusty wind. Manual instructs & typically mounted with 4 clamps per pv, no mention of wind zones. I'm planing on securing as recommended the 4 clamps to short rails(250mm, ~10'') with 2 roof...

Savings may be good for US, Can. but from downunder a $1000 mppt had at best a ~$100 US dollar saving compared to the local supplier, still not sold.

Easyeda "JLCPCB assembled" parts available (in stock) for C2, C4, C5, You recommend 10nF polyester 50v, Closest I could find there are 10nF polyester 100v. See below, will they be ok? (I can always buy 10nF polyester 50v separately & solder them in. But the more they can do the better.)...

Has anyone tried these? Do they work? I have a 15 degree roof, but even my near vertical pv's get dust buildup, then lichen takes a hold.