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I made an order for 18 of the 280Ah cells from Docan, shipped from the Texas warehouse. Went to the checkout and on the invoice was a $76 'transaction fee'. No mention of this fee prior to checkout and no details of what the fee was for. E-mailed the company to be told the fee was for...

I'm sure this has been asked before, but I can't find it, so.... Six DIY LiFePo4 battery banks, 4 X 200AH and 2 X 280AH. All have JBD type BMS and all have Bluetooth modules. I want to be able to monitor all of the banks at the same time, not switch between Bluetooth modules. When I say...

Not only a discount but a US seller with a good reputation. Couldn't resist a 16 cell order :giggle: https://www.18650batterystore.com/products/eve-lf280k

Before I post details, is it OK to praise the Chinese supplier of my new BMS?. Not getting anything out of it, just an acknowledgement of excellent and fast service.

Over the last few years I've built four 200Ah, 48 volt battery banks from individual cells I'd bought from various AliExpress sellers. Some cells were fair, others were basically junk. No need to elaborate as many members have also been there. After having an almost unheard of 5 days of solid...

As I posted elsewhere, due to my own carelessness I connected the balance lead from cell #12 to the connector for cell #15 and visa versa. Now the BMS is showing the wrong voltage on a couple of cells; so I've fried it. Looking for a replacement for the 100A JBD unit and I'm finding lots of 80A...

It's a PIP-LV-MK 3KW 48volt. Been running just fine for about 6 months, now for no apparent reason it can't 'see' the solar input. Did the obvious and checked the panel output, 90 volts and the current was quickly rising as the sun came up, but I had to stop at 10A which is the limit of my multi...

I have two MPP PIP 3048LV-MK 48V 3kW units in parallel. I bought them at different times as the first one has no filters on the vents, but the second one does. Just lately I've noticed that all my ceiling fans are now starting to drone, they were always silent in the past, and listening to the...

In all probability this question has already been asked and answered, but I can't find it in a search, so here we go. System. MPP LV 3Kw off grid, all in one unit. 200 Ah LifePo4 cells in a 16s configuration for 48 volts. QUCC (JBD knockoff) 100A smart BMS. Lots of breakers and fuses at the...

No idea why, but instead of the 16S BMS units I wanted, I ordered the 4S version. :mad: No excuse just a brain fart; so up for sale are two brand new 4S LiFePo4 100A Smart KBD knockoff BMS's $55 each and whatever the shipping costs from Roswell NM. That's just for the BMS, I'm keeping the...

Putting together my battery bank and watching the videos of the server rack batteries posted by Will, they all have heavy duty negative and positive electrical connectors on the front panel as well as a substantial DC breaker. Anyone know what they are called, or where I can buy them?

I'm about to start my next 48V LiFePo4 battery bank build and was pondering the best way to do it. Is there any downside to building 4 separate 12V batteries, each with it's own BMS, and then connecting them in series, rather than putting all 16 cells in series, and using just one 48V BMS? I...

I just reinstalled windows and now the text on the forum has no space s between the words. Just realized that as I'm typing I have to hit the space bar twice to get the space. Only happening on this forum. Any ideas; other than use Linux :ROFLMAO:

I received one of these a few days ago. https://www.makerhawk.com/products/makerhawk-usb-load-tester-150w-200v-20a-resistor-adjustable-constant-current-electronic-load-tester-battery-capacity-tester-module-intelligent-discharge-resistance-power-tester As a test I charged an old overcharged and...

I have the overkill BMS with the Bluetooth module on both my battery banks, and they are in an outbuilding about 50 feet from the house. Problem is that I can only get a weak signal inside my house, and it connects when it feels like it, and disconnects as quickly. Anyone have any suggestions on...

I already have one battery bank; 48 volt with 200ah cells. Overkill BMS, and working perfectly. My second, identical bank is almost ready and I'll be connecting it in parallel with the first. My question is, do I have take any precautions, such as only connecting if the banks are at the same...

As you may know one of my 200ah no name cells decided it was time for a change of lifestyle and it wanted to be a balloon instead, and started swelling; a lot. Ordered a pack of 4 cells from a seller on E-Bay at a cost of $560 including shipping. A fair price and I needed the replacement cell...

I'm in the process of upgrading my system and was looking for some 4 AWG wire. After fighting the inflexible 2 AWG THHN wire in my last build I thought I'd try something easier to work with, such as the welding cable offered by Windy Nation, but many of the amazon reviews say that this is not...

I built my battery bank before finding out how little I know. I believed that simply putting all the cells in parallel until the voltages were equal was balancing, which is far from the truth. So while waiting for a charger from EBay (I refuse to use Amazon) I pulled everything apart again and...

I received my 32, 100Ah no brand cells and connected the cells in pairs to give a single 200Ah cell. Top balanced, then wired them in series for 48 volts. Hooked up the Overkill BMS and all seemed to be good and they all started at 3.33 volts, then very quickly (5 minutes) one cell rose to 3.65...

I wanted to put the Overkill software on an old Samsung Galaxy 3 phone. Loaded in the apk file but all I get is a parsing error. No hints as to why, it just won't install. Anyone else have this problem or a solution?

One for the amperage capacity gurus. I have 32, 100ah cells and will connect two in parallel via an aluminum bus bar to give the equivalent of a single 200ah cell. The welded studs on the cells are only 4mm, so the plan is to drill the center of the bus bar and have a bolt as the actual...

Due to my dire need for cells to replace my close to the end FLA battery bank and the mystery surrounding the location of my other cell orders I took the plunge and ordered 32, 100ah new unbranded cells from a seller in Kansas. I paid with Paypal on July 7th, got the FedEx tracking number the...

I just watched an interesting video. Not just from the point of forum members buying cells direct from China, but the potential repercussions for those already importing and reselling them...

Not sure where I found it, but it was a patent for an upgraded Nickel Iron battery. Looked promising so a bit of digging found this. https://www.energystoragejournal.com/encells-nickel-iron-battery-production-starts-operating/ The cheaper than FLA, and lithium got my attention, along with made...

This will not help the production of lithium cells in the future. Expect the fight in the courts to last a few years. https://www.sacbee.com/news/business/article251872948.html

Just bit the bullet and bought 16 cells from AliExpress. https://www.aliexpress.com/item/1005001745607297.html?spm=a2g0o.cart.0.0.5a5b3c00IZPNXv&mp=1 Supposedly going to be shipped within 7 days and I can expect delivery in 20 - 38 days Where have I heard that before?:ROFLMAO::ROFLMAO::ROFLMAO...

Looking at the available capacities of LiFePo4 cells, there is an overwhelming choice; 50ah; 100ah; 150ah; 272ah; 280ah; 310ah etc. As each new higher capacity cell is available; that becomes the cell to have, and the lesser capacity cells become slightly cheaper and more readily available. My...

Checking on the internet for batteries, as we all do, I came across what I thought was a new player; Dragonfly Energy, but they share the same address in Nevada as Battleborn and even say "Buy from Battleborn". But when you click the link it takes you to Battleborn, but no sign of any dragonfly...

I may have found a safety issue with wiring MPP units in parallel as shown by MPP Solar. My plan is to expand my system and run two MPP units in parallel, the idea being that if one unit gives problems I can turn it off and run at 50% reduced output until the problem is fixed. But looking at the...

I'm sure it's already been asked and answered but..... I have some 250 watt panels which have 3 panels wired in series to give a string with ISC 8.85A and total VOC of 112.8V and if I wire two of these strings in parallel it will give ISC 17.7A and VOC 112.8V. My question regards the breakers...

I will be needing an 80 amp breaker/fuse/disconnect between my batteries and my PIP unit and there seems to be no end of this type available inexpensively. Has anyone ever checked their accuracy, or even if they work? I'm asking this because of a recent video by Big Clive where he investigated...

I'm using 10 AWG THHN wire through EMT conduit from my solar array to a junction box on an outside wall. From the box I intended to run the same wire through buried EMT or PVC to my outbuilding. I say intended, but have now come to a bit of a problem. NEC says it's a no no, and I must use THWN...

I'm hoping this will help others who are contemplating using UniStrut for their panels. Not saying this is the best way, it's just how I do it. Mine is an off grid system, or will be when it's complete, and I'm fortunate to have a roof that faces due south and at almost the perfect...

I received my 18 SanTan 250 watt panels a few weeks ago, and finally had the opportunity to install the first three on the roof. Before I put them up I checked the output voltage and it was fine, checked each panel again when it was in direct sun and each panel gave a solid 33 volts. Wired the...