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I think I have a battery that is quite problematic to charge and holds the other battery back. One cell constantly hits OVP early on... Now I'm trying to add inverter communication to the jk bms, but that won't change the physical issue... One battery will always hold the other one (or several...

I usually use WAGO and Phoenix Contact Terminal Blocks. I must say however that it's a bit opaque on their product catalogs and online product viewers, since it mostly says that those terminal blocks accept: - Solid Conductors (Class 1) - Stranded Conductors (Class 2) - Fine-Stranded Conductors...

I got the system up and running approx. September 2023. Still a work in progress, but I have 2 x 1p16s batteries (in parallel) with JK BMS. Deye is working in Voltage Control Mode for the Battery. IIRC on the Deye I set Float to 54.2VDC, Absorbtion to 55.0VDC and Equalization to 55.0VDC. I...

It seems to be a common issue. Yeah, at first I didn't think it was important. Duh :fp. I mean, the way to ensure that the batteries get fully charged is to keep a "reference voltage" for the inverter/charger of say 55V-56V for a 16s Pack (3.43VDC/cell - 3.50VDC/cell although at 56V I will hit...

I just had a nasty surprise when waking up this morning. TLDR is my setup consists of the following batteries in parallel (after their own independent fuse+breaker): - Battery 01 / jk-bms-bat-01: 16s 280Ah cells (LF280K) - I think this is HW v11 - Battery 02 / jk-bms-bat-02: 16s 280Ah cells...

I'd like to have some cross-checking of my current ideas for my Battery v2 Project. The Battery v1 was: - 2x16s in Parallel - Over designed - Too complex - Non modular - Non accessible (e.g. to torque cable lugs to busbar) - Lots of features not used - Took 3-6 moths to build - Super expensive...

I managed to start up my system and do some preliminary testing with AC (I could quickly run an air-air heat pump as a load ~ 1.5 kW). My setup is as follows: - 3 Inverters connected in Parallel (Master 01, Slave 02, Slave 03) - Inverters are all Deye SUN-12K-SG04LP3-EU - 3ph+N Grid (380-400VAC...

I finally started up my 2 first Batteries (2 x 16s x 280Ah cells) yesterday charging with one Inverter at around 3kW (approx 30A / battery). Today Charging them with all Inverters at around 50-60 A / battery. I read that the LiFePo4 Cells Voltage vs SOC is very flat in a wide SOC region. I...

I hope some of you might know the name of such a device, assuming it exists. What I am looking for is some kind of "shunt trip unit" Relay that, when energized (say 24VDC or 230VAC) "latches" and disconnects power (contacts configuration change from COM-NO to COM-NC). I would just like a...

Hi, I am considering connecting 2 cable lugs for each polarity at the Switch Disconnector (one at the "front" of the terminal/busbar, 1 at the "back" of the terminal/busbar). Bolt size is M10. I have ABB OT400E03 Switch-Disconnector for my Battery I also have WAGO 285-1185 for use with...

I FINALLY managed to put all cells inside my battery box and ... well ... a few things went wrong (again). I'm kinda disappointed with the result really. The cost was quite high, the quality so-so and of course, for all the extra features I wanted such as contactor, light signaling, extra...

Hi, I bought these Battery Terminals from Aliexpress to use as my Battery Terminals. They claim to be rated 200A each but I plan to use them at 100A only. I recently however talked with a friend who told me that copper is a quite soft material and won't really resist a lot torque (especially...

Hi, I have some of these Bad Boys WAGO 285-1185 Terminal Blocks. At first I thought about using some 50 mm2 wires from the Battery to these (Inverter Side), which is the minimum cross-section supported. Now I think I will use these near the Inverter for some "Temporary" connections (until I...

Hi, I'm progressing (slowly) on my Battery Assembly. I have a galvanized steel enclosure where the cells will be installed on top of a polycarbonate plate with all the required insulation. Some steel plates for fuses mounting, DIN rail terminal blocks etc But I believe the JK BMS has an...

I installed all the solar panels on my roof by following the advice of the guy that sold me the mounting system. Should never trust a sales person :rolleyes: . He told me that here (in Denmark) it's not required (by law) to ground a Solar Installation. As such now, all of the panels and Rails...

Does anybody have a recommendation for a battery charger for a 48V LiFePo4 Battery Bank (~ 2000 Ah , ~ 100 kWh) ? I need to use it to "fill the gaps" when the sun is not shining. Something like several x 2kW each or a big ~ 8-12 kW unit (3-phase). For use in Europe 230/400V grid :) .

Hi, I am in the progress of starting to build my first LiFePO4 battery and am addressing the low-temperature problem. I considered, after reviewing some posts here, to use some small silicone heating pads together with an aluminium baseplate in order to make the temperature uniform and heat...

Hi, I live in Europe so I'm not so familiar with US/UL type fuses. I see many people use and recommend class T fuses, however I couldn't find a clear statement about what they are and what they protect against. In the IEC world, there are several types of fuses. For instance: - gG is "Fast...

Hi all :) I'm facing a dilemma on how to connect all my batteries (build in progress) to the inverters, everything in parallel. Every battery pack and inverter is fused (and also featuring a breaker) separately. In order to keep the current sharing as close as possible, I'll cut all cables to...

Hi, I'd like to know if / how to connect several Battery Strings 16s/48V (each managed & balanced by its own JK BMS B2A24S20P, having its own fuse/breaker, etc) to my Deye Inverter (SUN-12K-SG04LP3-EU). Most BMS (e.g. Seplos BMS used also in Seplos Mason case) have some DIP switches to set the...

Hi, I had a read of https://diysolarforum.com/threads/clean-your-terminals.18271/ (I didn't want to resuscitate that ~2 year-old thread, therefore I make this one here) and I'm having some doubts. In that thread the general recommendation seem to be to be: - Fine File / Rub with Scotch Brite -...

Hi, I tried to contact Docan power to get some shipping quotes and accessories for LF280K cells (currently planning 16 cells), but at the moment where I'm ready to pull the trigger, I was given a sketchy outlook.com Paypal email address. Did any of you experience the same ? What other...

I am planning to install 40 extra solar panels on my roof and was looking at the Deye SUN-12K-SG04LP3 inverter with some BMS (still undecided, I think active balancing will be required given the high nominal current) and some DIY EVE 280Ah batteries (48VDC system, so I am looking at 16 cells in...