Rolf Bartels

Hey Guys, just reviving this post for those you are still struggling. First off, you can't take a chint DDSU666 off the shelf and use it, these have to be programed by Hoymiles with a recognisable serial numbe which will be stuck to the side of the chint meter If that is all in order, the chint meter can be powered from any where, but you need to install the 100A CT clamp. on mains live wire, basically the live live coming from the street, then you have to ask your installer if.you are not able too. To add the meter to your plant. Just out of interest. I installed several installation, but Ellie's for a while now no longer imports Hoymiles, where are you getting your units or are these old installations,. I am busy in contact with Hoymiles trying to revive these and plan to bring some back into South Africa,

Item: DiyBMS v4.6 by Stuart Pitaway Age: New Price: R2000 Payment Method Accepted: EFT Warranty: N/A Packaging: N/A Condition: New Location: Ballito Reason: I had to order min 5 and only want to keep 2 Shipping: Free Pudo Collection: Yes Link:

Hey Abe53 if you look at the pictures aobve, I have 3 x 14S configuration. Each Pack so ea. 1s or 1 of the 14 packs across is 80 x 18650's in parallel connected to a copper bus bar with 2a fuse wire per individual 18650. and these bus bars are connected to the adjacent packs bus bar to make up the 14s. I tested every individual 18650 by charging them and leaving them on the shelf for 4 weeks, any cell that dropped below 4.10v I discarded, I then did a full charge and 1A discharge and took the capacity reading, anything under 1800mah I discarded. Then using repackr I entered all the cells in the tool and it spat out how I need to group the cells so that each 1's pack is configured with the same capacity as the others. I have been running this system since 2020 and its inline so not as standby I use the battery daily, Night obviously on the battery and days, it's solar charing and excess solar drives the loads in the house. I am using the DiyBMS from Staut Pittaway to monitor and shipping the data to EmonCMS for historical data. Since inception I have only had to replace 1 single 18650 as this developed an internal short and self-discharge, pulling the whole 1s pack down. I only charge my bank, so each individual pack is 4.05v max and 3.4v min, I did some early tests and I am losing about 4-7% capacity of the bank operating at those voltage but increasing the cycle liefspan 10x Here is the historical data Here is the individual Cells, there should be 42 cells, I have at the moment disconnected 1 banks monitoring system as it has a fault, and I am repairing it.

first 9.5kw went live after 4 months, the 2nd 2 x 9.5kw went live 18months later. It's funny as soon as I had the first one running I kind of lost motivation.

Ideally, but not really, I would say the 80% of the cells are 2200-2800mah, and with 80 of them in a pack ea. cells only has <100mah max draw from them. Check this site out this is where I got all my information from. Second Life Storage & Solar Even just 1 row of 14 packs is big enough that the draw from the draw on a per cell basis would be <300mah at max current. This site is what I used to work out which cells belong where. rePackr - 18650 pack builder there is a excl version of this that I used so I could save it and work with it over time. These used cells have at least 80% capacity left, so basically a 3000mah cells would give me at a min. 2400mah. Laptop batteries are discarded when the stop working 90% of the time it's just 1 cell that failed and so the whole pack become un-useable until someone like me comes along and strips and tests them, Each cell is connected to buzz bar on each pack with 2a fuse wire, so if a cell decides to go nuclear the fuse will pop and it won't pull the whole pack down.

Everything except Aircons, Pool Pump and Geyser Element, but the Geyser is Solar so the element never really works, I have 7KW solar 4kw is gird tied with micro inverters and 3kw is connected to the Solar inverter which is also connected grid tied. I have run 3days without Eskom and it was raining .

I paid for the cells, nothing for free today, even though the ewaste companies would have to pay to dispose them, but the total cost was about R20K, with all connectors, shunts, change over switches, fuses, mounts and BMS I am using the DIYBMS from Stuart Pittaway, search youtube for diyBMS and his name there is also a forum here DIYBMS v4 - Hardware / diyBMS - OpenEnergyMonitor Community I have just ordered from JLCPCB the newest one, have to order 5 at a time, which is why I'm selling some.

Now It was a process !!!!! Procured old laptop battires, (6000-7000) cells ( 2000 odd laptop batteries) Stripped and cleaned them Tested and discarded all 0v cells Charged every cell to 4.2v and left on a shelf for 6 weeks Tested each cell after the 6 weeks, and any cell under 4.05v I discarded Charged again and discharged at 1A till empty and chargerd again, I avg the discharged mah and charge mah, any thing under 1800mah I discarded Palced on a shelf again for 6weeks After 6weeks anything under 4.05v I discarded the rest are good for use Then used some software called repacker and entered all the cells into this, I configured it to 80cells per pack, it calculates which cells need to go into which pack so that the biggest delta between the lowset and highest pack is 0.5a. each 80 cell pack is just over 180a. Cells ranged from 1800mah to 3200mah but the avg is about 2300mah

ewaste, old laptop batteries.

had then made locally, you can get the drawings from secondlifestorage

Just wanted to show case a small Powerwall I build using 18650's Built this bank on 2020, been running for 3yrs, and so far only had only pack have an issue with 1 x 18650 self discharging which I changed out. Summary: 3360 x 18650's 3 x 9.5kwh banks = 28.5kwh DIYBMS Monitoring

This is still for sale, if anyone wants to make me an offer, please feel free to do so.

Hey All, I am going to be putting an order in for a new DITBMS v.46 with integrated shunt circuitry, I have to order minimum 5 so I will probably be looking to sell 3 of them if anyone is interested. you can get some info on these from YouTube just search for Stuart Pittaway DiyBMS Stuart Pittaway - YouTube

This is still avalaible if anyone wants to make we an offer

I am selling my EPEVER Tracer 100A MPPT Solar Charge controller as my new inverter has 150A built in, this unit is less than a year old. Here are all the specs https://www.epsolarpv.com/upload/file/2107/EPEVER-Datasheet_Tracer-AN (50A-100A).pdf https://www.epsolarpv.com/upload/file/2103/Tracer-AN(50-100A)-Manual-EN-V3.1.pdf I am looking for R5000 Please contact me zero seven 1 five 4 five 7 five 7 7