35KWh Battery for $2K - Episode 8 скачать в хорошем качестве

35KWh Battery for $2K - Episode 8

In Episode 8: 00:00 Intro 00:33 Overview 00:47 Start battery Bank 2 Install B- through B7 09:14 17S wiring diagram 09:27 18S wiring diagram 18:17 Charge curves for 302Ah cells 18:50 30S Discharge curves for 302Ah cells See more details in video subtitles (transcript) Costing less than $2,000.00 USD, this video series shows the start to finish build of a 35KWh LiFePO4 (LFP) 500lb, 225kg battery module originally intended for heavy duty electric truck (36s, 120V). Using basic hand tools it is rebuilt for cheap as an off grid capable or grid tie hybrid solar system as a primary storage battery that is 2 strings at 60V. The build replaces the OEM protection circuitry and installs 2 Bluetooth enabled off the shelf Battery Management Systems (BMS) at 150A each inside the enclosure and then shoehorns 2 100A breakers into the Manual Service Disconnect port (MSD). The build shows wiring first as two strings for an 18s system (45-64V, nominal 59.4V) but the voltage proves slightly too high for a commercial hybrid solar inverter (could only charge the battery to 30%), so it is shown rewired as a 17s system (42.5-60.4V, nominal 56V). The build re-uses the 550A fuse that the module came with. This battery has ports for liquid cooling and 6.3Ω Kapton strip heaters for battery warming - but neither are used in this conversion, but are possible to use with a little more work if the climate/installation required thermal management. This battery was marked as a CATL/CSI produced 'C Pack' an "engineering prototype" of what became the CSI 302C35.0 and sold as 115.9 VDC Nominal. The battery tag is marked as Pack Type: L302C01 with a nominal voltage of 115.92 V. This module was specifically chosen for this build as cutting a single bus bar converts this 120V battery into 2 60V batteries and (on paper) is perfect for a solar powerwall. The pack is stamped as weighing 217 ± 6.5 kg. As built in the video series, the battery is capable of 12KW of continuous power output. If built with larger breakers and BMS's it can do 36KW continuous output. If this battery was installed in a modern EV car, you could drive about 120 miles on one charge. When installed as a house backup battery, using 12KWh average per day, this battery will last up to 3 days. This module uses 36 Contemporary Amperex Technology, CATL 302Ah LEP71H3L7 (LEP71H3L7-01) or (CTPS-71H3L7-01) cells that are rated for more than 4,000 cycles with output of 1C (302Ah). If cycled daily, that's 12 years! There is documentation from CATL that this prismatic cell form factor 71173 existed since at least 2018, but these 302Ah cells were not introduced to market until 2021. CATL partnered with US based Coulomb Solutions Inc. (CSI) to create their first generation pack modules branded as module and pack or cell-to-pack (CTP) for use in bus, truck, and construction machinery starting with energy company SPIC helping to design the Xiangtan Electric Manufacturing Co. Ltd. (XEMC) 120-Ton SF31904 AC behemoth. CSI markets these as part of their advanced battery line, to be used as heavy duty vehicle battery packs. Intended to be used as a kit, the C Pack is available in many different configurations from 115-201 VDC per module using cells from 173Ah to 302Ah. The battery module shown in this video (302C35.0) is sold to vehicle producers for use at 5 or 6 at a time (1P150S - 1P204S) and can be double or trippled for some truly huge builds with vehicles up to 3P150S - 3P204S. When all those modules are wired in series that makes it 600V technology. At 18 modules the batteries weight 9,000 lbs for 630KWh of vehicle power! In 2022, CATL went on to partner with Sany to produce the SKT105E rock mining and hauling truck using what appears to be battery modules very close to these C-Pack batteries form CSI though not very much information is available. These CATL/CSI modules are starting to show up for sale along side EV salvage batteries for sale in the United States. They are currently available at a profound value $50 / KWh which is significantly cheaper than the raw lithium iron cells are available for. These come packaged in an automotive grade weather proof assembly epoxy bonded to a glycol liquid cooler / heat spreader backed up by steel compression straps, and includes a 550A safety fuse. The pack has laser welded aluminum bus bars and has huge copper terminals capable of handling sustained heavy loads. The Manual Service Disconnect port (MSD) included for automotive applications is the perfect place to see if we can fit in some breakers. Enjoy the build - and if you try this don't drop one of these on your foot, or worse, slip and drop a metal tool across exposed battery terminals. Video thumbnail from Sany Group promotional YouTube video: "SANY Electric Mining Truck SKT105E" Dec 5, 2023