huitang we need to know how many pieces of lithium cells you need to buy, LFP cells is suggested to build a BESS. there are 50Ah、100Ah、150Ah、206Ah、230Ah、280v、304Ah cells can buy in the market. if you want 100Ah cells, you need to buy 3125pieces, if you want 280Ah, you need to buy 1116pieces of cells. let’s take 280Ah cells for example to build a BESS with high voltage BMS. we need to make 1116pieces of cells to connect in series to be battery packs/modules. there are many options to make different strings of battery packs. if you consider the battery pack weight, you can make each packs to be 9S , then you can get 124 battery packs. if you make 18S as battery pack, you can get 62 battery packs. Of course 18S battery packs can help you save money. Check the total load for your system and choose a suitable PCS with voltage range and maiximum Kw. for this project, we choose PCS with 400-800V 500kw we now need to make 62 battery packs in series and parallel, system voltage is target to 576V, (18S*3.2V *10=576V) which means we make 10 Packs of 18S(57.6V) in series as a Rack. then 6 racks in parallel. finally we got 2 battery packs extra for future replacement. Now, the structure of the entire system is very clear. We can choose GCE high voltage BMS with an overall solution to connect all battery packs together. Each battery pack need to install a piece of slave BMS(BMU), so we need to buy 60pieces of 18S BMU, GCE‘s BMU is very easy to connect to each cells, and communication connection with cascading ways to protect the signal from interference. And each rack need to install a master BMS(RBMS), total RBMS shall be 6 pieces. finally, we want to collect all cells datas together and display on a screen. SBMS will take this responsibility. High voltage BMS products list as follows: 60pieces of BMU and wire harness, 6 pieces of RBMS and 1piece of SBMS. it’s so simple, because it’s GCE BMS overall solution, they make complecated things to be easy and help many big or small buyer to join into the new energy storage facilities or services.