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Okay @David in nh , I'm chickening out on the DIY charger for my new batteries... have returned the 3000w inverter, and ordered this. net +$500 cost. Thank you for the pointer to this, I'll let everyone know when i have this up and running.

thank you for the link @David in nh , may still be a bit rich for me, especially since I have everything but the grid power to charge battery purchased and ready to go. :-)

Electriccarpartscompany.com it’s been a slow ordering process, they are swamped!

So, what kind of loss would a flat mount create?

I’ve decided to skip this whole mess, and am going to build @Will Prowse ’s 24v CALB 100AH day battery, ordered the batteries to day (US stock). Looks fun to build!!

Ooh, 3 phase! I’m glad I’m not the only one who seems to be ordering solar stuff every day. O.o I’ve only been hooked for a month, but that doesn’t mean I haven’t ordered one of everything on the market...

now THAT makes sense! thank you!

For my ecucation.. can someone point to more text about what this whole "pre-charge" is doing? I'm a bit lost as to what it accomplishes tyvm

yea, if we are getting down to 50-60% life, seems that's when the steep drop off is going to happen. Maybe a phone call tomorrow is warranted.

Now I’m scared to buy two of these from bigbattery.com they are advertising 3kw @$699 each with $350 shipping: https://bigbattery.com/product/24v-lifepo4-power-wall/

Oh nooo!! I just finished my roof install yesterday, and last night we had some good wind, all seems well, but I’m thinking the schedule 40 PVC that ties the angle supports may need to be upgraded to aluminum... :-/ so much for cheap, if that’s the case. The whole thing felt pretty darn strong...

Thanks for the link @Steve_S , but that’s too rich for my blood. ;) I was thinking of DIYing up a raspberry pie, high/low voltage sense, and a switch to energize a 24v charger. :)

i am also setting up multiple smaller systems for: office, low watt house, and lower watt shop. Also, i will be using ac switching forks watt house

I hear you about excited! I spent the last 2 days installing my panels, since it finally stopped raining! :) (I know... room for more. My angled mounts are slightly diy, so that was fun.) My system is bigger than you need, but it seems the 24v is the same cost-ish as 12v, and gives you...

Did you get them from www.bigbattery.com? I’m thinking of buying 1 or 2

OMG! You made me snort! Larry, thank you for asked no this! I think I’m going to order one of these 24v things on Monday, and given it’s $350 fixed to ship, buying two seems smarter. Any help on the use of these, and “are they worth buying” would be great

Howdy! I can give you a little noob helping a noob. We sound similar as DIYers, so... I’m building a modified version of the 24 v system here: https://www.mobile-solarpower.com/2000-watt-24v-solar-system.html I pretty much bought all of the pieces, and really like them as recommended. I did...

It’s a 24v battery bank. I see what you are talking about, just at 24v. Here’s my use case: I want to be able to keep up with 700watts of office. So, I will have the 3KwH battery bank, into a 2000watt pure sign inverter, feeding the office. I’d like to have a charger that mostly catches up with...

Hi. I know this is a bit off topic, since it may not include solar... but, maybe not. I am going to use a power wall (probably from BigBatteries.com) as an all day UPS for my computer, at some point sitting down stream from my solar setup, but if I want to get it going today, How would I charge...

I found it, the BMS. Hope it arrives from China. :-/ does anyone know where you can get an 8s 100a LiFeP04 BMS already in the states?

It’s been a few days, but I am just about ready yo make some cuts in the existing nickel, and solder some new paths. I managed to plan it out with ZERO nickel overlaps!! I’ll post some pics, and also show how cool the packs are!! They will fit together in ANY orientation, which I thought was...

That’s great! on a super positive note, I was able to get the whole system kind of hooked up, with 2 panels, and a pair of lead acid batteries, just to test out my hardware (while I’m in Amazon’s return window). Was fun to make electricity today!!! And I even ran my l14” bandsaw off of it for a...

Hey @Craig, tyvm for the feedback, but now i'm confused. Will my MPPT do the right thing with that 90V, going into my 24v LFP batteries? I am still struggling to wrap my mind around the current state of the art... vs 35 years ago. :-)

Well now, i totally reversed that. It's 2s4p. o_O So, sounds like 19.01V x2 and 9.44A x4 So, what i learned was: It's the short circuit Amperage, and the max power Voltage that goes into the AWG calcualtion, thank you. These are the specs for the controller: 40A MPPT Charge Controller...

Getting back to this, now that i am less overwhelmed by the real world, and back to processing this and responding. I have both questions, and ideas. First, 3s of this cell is what i am looking for? Then 8 of those to get my 24v? For some reason I had it in my head all of this stuff liked to...

Hi All! I have found a loss calculator to tell me the AWG i need, but am a bit confused on the current (heck, and maybe even the voltage) aspect leaving the combiner, and making the longer run to the SCC. So, given that I will have 8 panels, in the form of 2p4s for a 24v system, The specs...

Thank you! That makes sense. An advice on what I use to combine the pair? At the panels before making the run down to the controller?

Thank you @kernel! Given the cost of bracketing, and do-dads perpanel, I’m considering going with higher watt panels... this is on my shop, which is 24x24. i don’t really know how I would mix panels. Or does the MPPT save my bacon on That?

Hi all! I've gotten the components for William's 24v system. I'm trying to get a "real world" max of what i can add, solar panel wise. I'm trying to figure out how many solar panels I can hook up to the system, given the panels i've chosen to go with. I have the "EPEVER MPPT Solar Charge...

I totally agree! I like the way you think! And, i can always use the left overs on something... or as a backup. :-)

One of the 4 subsystems is a bit out of voltage from the other 3 (3.2, 3.2, 3.19, and 3.16), do i need to get them all to the same charge before paralleling them up? Oh, and i found some LPDE flat sheet that should work for insulating my nickel chris/cross strips. I'll post the results of that.

I think i saw someone on youtube with that kind of setup. thanks!

Yep, i've got the spots drawn. What i was grinding over last night was other options. Unfortunatly, the plastic housing was put on before the spot welds, so seperating them into 4 descrete parallel components is probably the wrong direction. As you can see from the pics, they are a chris/cross...

This is actually an after market brick that goes in place of the spare, made by A123 in '07 (ish)

Oh, now that makes a ton of sense. I was thinking of things the wrong way. The back of all 44 are on the same nickel sheet, so it's just fiddling with the top. TYVM! :)