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Folks, I am down to the last items with a long awaited battery bank. I have now 3 fully configured 4S batteries (280 AH each). :eek: Putting them in parallel, using 0 GA wire to connect them. (I was going for 4 batteries, but one has Gremlins, and also space in limited.) :alien: :cry: So ...

And patience is once again rewarded. When shipping half way around the world, 70 days which includes several modes of transport seems pretty good to me. YMMV. Good luck with your cells. I have finished construction of four 12v 280 ah batteries. Now in testing stage. Pics to follow soon, along...

Glad you got your money back, and sorry it did not work out for you. I do hope that you get them, and that things get settled with the vendor.;)

If you have additional concerns, I think you could always put a heavy weight diode in to prevent backfeeding form either side. Your plan sounds solid to me, but hey I'm just a retired old white guy!

The 7 pin is only good for a trickle charge. The wire is so thin that amperage will be very low. The DC-DC converter will allow for more direct charging, but if you are charging the batteries otherwise (generator etc.) I don't think you really need to count on the 7 pin connection for charging...

I am building exactly this right now. I will have 4 12V 280 AH batteries when I finish configuring them. I will be able to configure either 24V @ 560 AH, or 12V @1120 AH. I am building a charger using Server PSU's from Ebay, and a Buck/Boost converter to make that right. My end game is to...

Once again, patience is rewarded! Glad you got the info. now to wait for the boxes. Kind of like being a kid at Christmas all over again!?

Update! Looks like that was it. I now have a "2000 watt" invert running (actually only claims 850 running watts, and I am only testing it at 50, so Things are looking up. Now to test the battery by drawing it down, and then recharging to see where we are with capacity. If all that works, I...

Found it! The SWITCH function on the function page keeps reverting to "on" which prevents me from witching discharge on. Reset now. Fingers crossed this will work. setting up for inverter test.?

So, good news/bad news. I found a loose connection from the B- side of the BMS board, and fixed that. My app. will not allow me to put the battery in discharge mode? The temp, and voltages seem within range, but when I try to turn on the discharge switch, it goes green for a second, then...

OK I have seen both ways talked about and debated, thanks for your input. I think you have a point that neither charge or discharge is unlocked and the app is showing locked, so I will work on that. Thanks again.

Have not been able to find an answer to this, so sorry if it exists. Just completing my first battery build. Getting ready to close up the case, and all of a sudden the voltage reading at the terminals is way way off. Wiring sequence is: Battery- --> shuntB- --> shuntP- --> B- on BMS -->P-...

Understood (about frustration with waiting). Consider that the time scales we are enduring are beyond what we are used to. But since we cannot just drop round to the Big Box store and pick these up, we are at the mercy of the shippers, even more than the vendors. My first order had me pretty...

So i did not see many replies to this. I hope you have found that there are a number of threads on here that deal with that. Also some u-tubers out there have exactly this in their libraries of videos. I, in fact am working on this issue for myself. Please DM me if I can assist as you go...

I hate to ask, since you are being so forthcoming, but do you have a diagram? (I learn better in pictures! ;))

My first order, back at year's end, seemed to take forever. Patience grasshopper! The second order arrived last week, with about 30 days total time as I calculate. I almost canceled the first one, did not even realize I was waiting for the second one, got a message saying out for delivery and...

Thanks for all the info! The six volt difference is interesting as I was going to try a 24V battery using series PSUs at 12V each. That would likely give me 28 0r 29 V of input, but I may need to go even higher given what you say. I do have used PSUs from eBay and they were a great value for...

OK interesting. So an MPPT does not care that it is a switching power supply? I thought perhaps the switching would throw off the tracking? I am tempted to try the PWM because of the difference in cost, but still deciding. Thanks for the info. Any other advice on doing this that I might not...

My use case would be strictly a PSU arrangement through the solar panel inputs. (24V~ with about 40- 50 A capability) I just want to avoid having to buy a super expensive charging unit. A PWM SCC seems like the solution here as it would allow for charging a LIFEPO4 (assuming that capability on...

Do you have a link, item name or other information on what you used please?

I too am looking for an answer to this? What exactly is the problem with switch PSU to PWM controller? I have been unable to find any discussion, or any wiring that shows a definitive reason why we could not do it? Where are the answers when you need them?:mad:

Late to the game here, but I have some specific questions please? If I were to use a PWM SCC and to simply hook up the PSU (2x12v for example) through the solar input (assuming the same polarities etc.), Is it that simple in practice? Is there anything I need to be cautious of when trying...

This is the BMS I have recently received. It is 300A, and unfortunately does not have a BlueTooth capability. Looking to test and use it with the three sets of 280 AH cells I have received. https://www.amazon.com/dp/B08N4SGPNB?psc=1&ref=ppx_yo2_dt_b_product_details

Great questions, as I am also close to completion on my first of several 280 AH batteries for my RV. I too used a group 27-1 case for the battery, and soon I will be posting pictures of my final build, just gotta get things tightened up... I am using additional products like inox to try and...

So far I have ordered and received 16 units of 280 AH cells from China through AliExpress. Two separate orders, from two different sources, and delivery was in both cases, if not fast certainly within expectations.

The only thing I grok that might affect this, is if you are using 2 120 A BMS in parallel, but you are saying that you plan on drawing 240A from the bank, that is not leaving you any head room on the BMS. I would be a little concerned that you might go into an over discharge situation easily.

Thank you so much for this reply. While I understand that you are going from your own experience, I really appreciate the forthright in detailed answer you provided. As someone without the level of experience others such as yourself possess, it is difficult to analyze these offerings when...

The first post on this thread has several attachments showing flexible panels. Has anyone on this list actually tested them, or are all of the "they are crap" comments merely from observation of the ads? I do not see anyone here giving direct evidence of their "crappiness" or otherwise. I...

I know I am late to the party, but has anyone actually tested these panels or their brethren?

Now that is something I did NOT consider. Going to check both that and cleaning the contacts this evening. Thanks everyone!

Thanks for this. I have checked, but I will do so again, as it is quite possible I missed something!

That sounds about right.... A cat hair huh? Well I guess I'm lucky I only have a dog!;) I have tried to make sure the posts are clean and the pads under them as well. It seems to be doing fine on a parallel basis, so I am going to leave them alone until 3.6v or so is reached. Thanks for...

So, to answer your first question, I wanted to see if the "runner" condition was still present after balancing (to some degree) the individual cells. I am now using the parallel method to continue balancing, since the one cell went overvoltage immediately, and kept interrupting the charging...

I do not see this particular problem in any thread so here goes! I just received my bench top power supply. I put all of my cells in Parallel to start out, and things seemed to go fine. I was charging at 3.4v and about 10.4A Charging was taking place as my starting voltages on the cells was...

In re-reading the original post and your response, I realized that, yes I am sure there is a load because the "free state" voltage (unattached to a load) is 3.4, but when I put it to the cell terminals, it goes down to 3.1 ( voltage of the cell after discharging into an LED load) without any...