I have ordered the battery cells this morning. My supplier is NKON, based in Holland.

Contrary to what I have planned in the beginning, I have not order only ONE type of cells. In fact there will by not less than 16 different types of cells mixed in the 10 kWh string.

In fact, 14 of the 15 modules will be populated with the same type of batteries, up to 200 Ah per module.

A special module, called "Hybrid module" will contain a mix of different types.

The following table shows the detail of the composition of each module and the amount of cells for each of them.

These 16 types are among the most efficient and powerful 18650 cells currently available on the market. They are from LG, PANASONIC, SAMSUNG and SONY exclusively.

Arjan from NKON gave me a lot of indications and very good advices during the cell selection process. Our goal is to compare the evolution of each type of cell during time, in order to collect some valuable data regarding their life. These data will be shared with the community.

Thanks to a dedicated "Characterization mode" built in the BMS, We will be able to make automatic and safe charge/discharge cycles on any battery module as often as we want. The data will be collected by the Raspberry Pi embedded in the BMS main board.

Next update when the parcel with the batteries inside has arrived...