DeonBez

Hi @Sats Nkamoto , yes I did some DIY builds. First using Seplos boxes and EVE LF280K cells and then some DIY aluminum boxes and JK BMSs. Here are some photos of the DIY cases: Hithium cells - Product Opinions & Reviews - Power Forum - Renewable Energy Discussion and here https://powerforum.co.za/topic/31252-143kwh-diy-battery-kit/ The cells I imported so we can negotiate on the price if you are serious.

Hi @Sats Nkamoto , I am also based in Cape Town (Strand) and I have very similar setup and can assist with many things related to your The Plan. PM me if you want to get in contact and discuss some options further.

I know someone who has some (I think 6x) of these Dyness 3.6kWh 48V Li-Ion Battery (not the A48100 but also 48V) for sale Age: March 2022 Condition: Working 100% (about 850 cycles done) Warranty: Remainder of 10 years Price: Negotiable Location: Western Cape (Somerset West / Strand) PM me if interested

@Beat if the situation repeats, you do not have much to lose by setting the charge settings a bit lower for a test period. I would recommend trying bulk at 52V (or 51.5V) and float at 50.5V. Hope you come right.

Hi @Beat Not sure what type of BMS is in the battery pack. To me it sounds like what I experienced with JBD BMSs when cell over voltage occurred. Even after the over voltage was cleared, the BMS did not reconnect by itself. I had to force it to so manually by isolating it from the other packs and then drawing current (resistance between the terminals). As soon as I connected the resistor, I heard the internal relay click and it was working as normally. The way I solved it in the long run, was by setting the charge voltage never to be higher than 55.6V (3.475V per cell) during Bulk or Boost (current charge phase) and 54V (3.375V per cell) during float. Although in your situation no alarms were showing at the time, it might have cleared already. Not an exact answer but al least an possibility... 🤠

Since 2021 I used the voltage settings below (no comms between Inverters and Batteries): 55.6V (3.475V per cell): Absorption phase 55.2V (3.45V per cell): Equalization for 1 hour (and yes I know all the super intelligent says it is not for LifePo4 ... but trust me it is good for the slow cells to catch up again) 53.6V (3.35V per cell): Float Over 4 packs (i.e. 64 cells) the voltage difference is normally below 10mV

@superdiy Is it not possible to just use a USB to RS232 directly?

Bump - Price dropped (from R37500)

Bump - Price dropped (from R43000)

Bump - Price dropped (from R45000)

Bump

Item: 14.3kWh DIY Battery Kit Age: New Price: R32500 per kit (collected) Payment Method Accepted: Cash / Instant EFT Warranty: 3 years on the cells - non-local supplier Packaging: Original for most Condition: New Location: Strand, Western Cape Reason: I built enough for myself - cells leftover after builds for my own use and friends/family Shipping: Not preferred Collection: Yes, please Links: Pictures, JK BMS, LCD, Terminal Set (almost like this one) EVE280K-Product-Specification-Sheet.pdf 14.3kWh DIY Kit includes: 16x EVE 280Ah LifePo4 cells (LF280K cells package in 4x padded boxes each with 4x cells) Eva foam padding between cells Yellow Fiberglass isolation sheets under cells Vertical Aluminum Box with high density silicon feet, threaded rods with compression plates for securing/mounting of 2 rows of 8x cells 200A JK BMS with built-in 2A active balancer including switch, cables and 3.5” LCD screen 2x 200A DC terminal sets (Black/Orange and male/female for 50mm2 battery cables) 200A DC breaker and fuse holder with 400A fuse Assembly optional: Will assemble and test on request – only for collection as don’t want to package and ship a heavy (>100 kg) battery

@Mackie , as from https://efergy.com/downloads/ https://drive.google.com/file/d/1Zz9LtS6TzJJLZxyVlX2UFqYgqztnG1MV/view?usp=sharing

@Sylwia yes, I send a PM with details.

@Sylwia, I built a few (around 10) of these boxes since 2021, always the horizontal stackable ones. Initially Seplos did not pack all loose components securely inside the box but this was rectified and improved significantly since. It is easy to build (simple tools) and takes around 2.5hr learning to assemble the first one and then around 1.5 hrs per box. I never had any issues with BMS balancing since I always used new EVE cells. The only real negative thing I have to mention is that a big capacity battery like this is heavy (two strong persons are required to carry it). This is true even for off the shelf batteries of similar capacity. If you want more details and also directions on other options for DIY boxes please pm me. I still have some 280Ah EVE cells and complete DIY box already manufactured if you're interested.

Apologies for stepping in on a classified thread... @ZS1SCI look at this thread. If you are interested in a box let me know. I have a font panel that fits the JK BMS 3.2" LCD and the JBD BMS LCD.

@cp69 yes, the last one was around R6700 as he is making it in small quantities. Somewhat expensive for a DIY enthusiast. PM me if you are interested.

@GJ Cronje I used and sold some of the Seplos MASON 280 boxes. But currently seems too expensive due shipping overhead and prices that came down. A friend of mine manufactured these boxes using 3mm aluminum: The JBD 300A BMS was used on this.

@GJ Cronje nice, would you mind sharing some pictures of the box. Well done!

Nice @GJ Cronje. Which enclosure and BMS do you plan to use?

Thank you for clarifying. What does it mean though?

Up to 16000 cycles at 10% 3500 cycles at 95%

@WazzaCPT As long as one connects the TX signal of the inverter to another serial port RX signal and the same for the Dongle, it should not interfere with the existing communications taking into account the cable length limits for RS232 which is dependent on the baud rate but generally stated as around 15m. I have not looked at the protocol to know if only TX or both TX/RX data packets are needed to implement monitoring but am sure other forum/internet members already reversed engineer it so the info will be available somewhere. If you are prepared to open the Dongle, yes. Not sure how the ESP32 is powered and if another ESP32 or similar can be powered from the same source, but this information should also be available on the forum / internet. The diagram attached in previous post was really more to indicate sniffing should be possible without modifying the stock Dongle by just using a breakout sniffing cable 😃

@WazzaCPT I am sure you would be able to this. Two serial ports are needed (with the same logic as the current one) to monitor TX and RX data Below is a typical example connection diagram for unobstructed sniffing of serial data. P1 and P2 represents the existing Sunsynk inverter and Dongle connectors (not sure about actual male and female on dongle/inverter). P3 and P4 provides a sniffed copy of the TX and RX data between the Dongle and Sunsynk inverter which can be interpreted and used for own monitoring by connecting to micro controller or PC. Hope this helps to simulate some ideas ...

@ErichK, not used but might be of interest. Also not sure if in stock: https://electromannsa.co.za/shop-the-latest-affordable-gadgets-online/catl-120ah-3-2v-lifepo4-prismatic-cells/