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Thank you! Didn’t see the other thread. Just bought me a PowerQueen 12V LFP 100Ah for just under $250 (before tax+free shipping) - that is just under $0.2/Wh, and even cheaper than like-for-like AGM replacement! And am gonna drop it in my 1250 with an inline Victron Smartshunt and consider the...

How did this work out for ya? Which shunt did ya end up using? Any issues with the wall charger?

Thou this is an old post, glad I discovered it! I have an old 1250 with dying AGM battery that I was hoping to replace with one of this cheap chinese LFP ones. Wasn’t sure if the wall charger would be compatible to bring it up to a level where top-balancing by the BMS could occur. Is the wall...

This is exactly the project i was looking for to keep my sanity this summer! Thanks for posting this. What’re the minimum/optimum sizes of Pi RAM and SD card required?

Hi. Thank you for this link. That was along the lines of what I had in mind for a tool, but unfortunately, this calculator doesn’t exhaust all possible permutations of configs to optimize for maximal output/minimal loss. For instance, I could combine my panels in a 2P3S config to yield 311W...

So funny y’all had also been thinking about outfitting the 1250 with some LFP juice! I ended up keeping it as with the original AGM chained to another 100ah AGM as both run like new, and instead build out a separate 300ah LFP bank that I can use to top off the Yeti as if plugged in to shore...

Yes, how they’re configured becomes more critical. That’s why I’m shocked none of the big PV manufacturers have an online tool that can optimize large scale configurations of panels with varying specs. It would appear a simple algorithm but powerful tool when building new or expanding upon...

Only one need to match to optimize the config as series or parallel without limiting the output.

Both or either?

Ok. I thought that would be useful tool to build an array, rather than manually iterating through random configs. When you say “mismatched” do you mean of the rated wattage or Vmp/Imp specs? Granted they’re all related by Watt’s law, but how you configure them (series vs parallel) seems to...

Hey, do you know of any app or online tool that can take a set of different panels and can predict the best/optimal configuration for them? Tried Victron, but didn’t find any…

Hey, I wanna thank you for sorting out Yes, and I wanna thank you for helping me sort out that confusion. I had been sizing my MPPT using Voc/Isc and erroneously adopted those same parameters to predict my output. Big thanks!

There’s only one series in that config and 2 parallels, so it seemed intuitive to me to call it “2P1S”, but am oblivious to any conventions, so i stand corrected! Yes, the 50W stands out, but i didn’t wanna drop it all together, since mismatching isn’t an issue when either voltage or current are...

Just looked up my spec sheets for the panels and the Vmp and Imps are 17.9V/5.72A for the 100W renogy’s, 18.5V/2.71A for the 50w renogy and 19.2V/5.21A for the 100W ecoworthy. When i recalculate the output this way, I get about 82% of the rated wattage, which seems reasonable for this set up...

By 2P1S, i meant the first 2 panels are in parallel as are the last 2, then the 2 parallels are configured in series to complete circuit. My understanding from reading Victron’s Wiring Unlimited and consulting Renogy engineers was that you always use Voc and Isc for sizing panels and charge...

Is it possible to configure solar panels in such way that the calculated capacity exceeds the nominal rating? I also queried Renogy and they confirmed my math but implied it’s very unusual and made me feel lucky about it! But am still skeptical, so wanna crowdsource the basic physics to you...

I bought PQ 300Ah last month directly from them after negotiated a price just under $900 including shipping/taxes and a bonus 20A charger! They are really the best to deal with and their packaging rivals that of Apple products, for what it’s worth, in case u wanna gift someone for the holidays...