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Ok, my [LV 5kva-48v] all-in-one specifies: PV array MPPT Voltage range: 60~115vdc. So for my Sunpower 250s there can only be 2 in series, never three. Thanks for clearing this up. --

> I used to use Class T fuses, that is till one day, one literally disintegrated in my hands! A "Littlefuse" brand no less. [Steve_S] You were disappointed there was no explosion? Maybe it simply did its job properly without any theatrics? What were your hands doing inside live circuitry...

Do you want 2 cells or $4k worth? If the latter a drive to SLC (the Fortune guy) would be worth your while. He's got tons right now. --

1. Did not buy it from Ian; email is from someone else. 2. Do we know the model# of the all-in-one unit? Is it 5kw (which requires a 200ah battery pack)? This box is 79ah. 3. Forced to watch 2 boring videos instead of a couple fact-filled paragraphs. Did OP ever watch a Will Prowse video - at...

meanwhile . . . > So the current theory is the inrush demands from the capacitor are causing the battery to fault, which is why cycling it with the power switch works. From what Craig said above, it sounds like a defective battery (e.g., inrush is 60 Amps, battery can supply 130 amps) since...

Open circuit voltage (VOC): 39.85V x 1.1015 x 3 = 131.6 Max power voltage (VMP): 32.8 V x 1.1015 x 3 = 108.3 Open circuit voltage (VOC): 40.0 V x 1.1015 x 3 = 132.1 Max power voltage (VMP): 32.6 V x 1.1015 x 3 = 107.7 [This is what I see, devoid of commas, whew!] Re: "LV 5KVA-48V...

Oops, forgot about the V(cold boost). But I'm still curious if choosing instead Voc 44.5v panels for my next batch would prove to be more electrically efficient since now 3 are in series @133.5v (which is <145Vmax)? IOW feeding as much V into the MPPT as you can get away with would be somehow...

> I got the unit off of ebay. [OP] Internet/ebay is rife with phony 'MPP-Solar' units. You need to indicate who you bought it from. VR --

> a 4 cell Lifepo4 280ah battery [OP] I'm still trying to visualize this. VR --

> LiMn2O4 (LMO) [tictag] Have 168 cells (26ah) of LiMn2O4 for my new powerwall. All read 3.50vdc for the past few months and are in clean condition. Anyone have specific recommendations for this chemistry? VR --

Vacation mode: 1. Turn OFF inverter/all-in-one. 2. Leave solar array(s) connected. 3. Disconnect battery bank. What could go wrong? --

I just got 10 unused Sunpower 250w from satansolar.com (not a typo). Did you check them out as well? They are in the same city (Gilbert,AZ). Why pay more for used (gahh!). Ok, title says 25 units, didn't see that. Plenty to play with!! --

Pretty obvious which retailer runs this forum. [sadface] --

Two different solar dealers, both in Gilbert, AZ: 1. satansolar.com - I bought 10 unused Sunpower 250w with original SP UL label and also Fabtech warranty disclaimer label, reasonable freight$. 2. santansolar.com - supplier of used panels frequently mentioned hereabouts. --

I trust everyone on this board is using a VPN at all times. --

So leave battery bank (LNM) connected? I still have grid for the house; solar is to charge EVs and dump any excess into h2oheater/hydronic. EVs could be maintained on the grid or else left disconnected. Six months is more than a vacation. 8^) --

> That most certainly IS a typo 2 different dealers, both in Gilbert, AZ. --

Seems like some of these systems are not power hungry enough! So hook up a water heater as an energy dump so you are never even near supplying 100% of your needs. Then, assuming dual MPPT channels, try to maximize each channel either seasonally or by tracking. Dynamic tracking is fine but with...

> I realized mistake and edited it. [MBR] No, you didn't. That matzoh ball still hanging out there. > The only reason you need Voc and Isc is to make sure your controller can handle these maxima. [upno] Lets pretend that the panels were finally connected electrically to the MPPT input...

I need 12s LTO BMSes for solar install located high in the Rockies. Low temp immunity is main reason for LTO choice. What do you recommend? --

I have not begun to decide on the framing since I need to clear trailers etc completely from the south side of the house. My framing will need a ledge or maybe just bolts on the bottom row to temporarily lay the lower panel onto. The upper row can be laid on top of the first row initially as it...

Manufacturer warns against handling these panels by one man, but I am what I am :) Also I have a 17ft assistant (forklift) that could help lift these panels off the trailer where they are stacked. So first decision is to always keep the panel in Landscape Mode with a separate sling at each end...

A 5kw 48v 'all-in-one' itself consumes 25w, a somewhat unfortunate fact. With new cells in the 48v pack why add to this misery by having 2 relays that also consume xx wattage? The new cells should stay in ~balance by themselves for the most part allowing a light-weight relay-less BMS to play...

Only LTO chemistry can deal with those storage temps. LTO is unobtanium however. --

Ok, so if you want to be able to discharge @1C the only BMSen available in the +300ah realm require the safety of relays or breakers that necessarily use some power themselves. What if you went away for 5 weeks, would you leave the system running? --

> and everything comes out in PDF format instead of Excel... Ok, I'm outta here . . . --

Where is the list of components with basic specs? Explain 'multiple contractors', which is a big red flag. Why are all 12 in series? Is that what SunnyBoy6 requires? Show that you understand its requirements. Do we have to look up the specs for you? Why not try to get it working properly w/o any...

You need to do an analysis on your existing system(s). Have you plugged in a slow charger to the i3? Why is there no room left on your existing setup? Do you have A/C running (this may be the culprit). But ignoring your present system makes no sense for such minimal EV usage. If you commuted 100...

Why not buy from a reasonably close importer? Why not indicate your location?? Distributor in Utah, US has fresh tons of LFP batteries, for today's example, no need to ship from China. --

Coming this fall - Solar Sitcom!! Catch the excitement here on Channel America as local families vie for the Solar Crown!! --