LiFePO4 batteries generally have a very strong tolerance to varying temperatures. However, if you install these batteries in extreme environments their performance and operation may be internally limited. Additional environmental consideration should be taken based on your climate.
Extreme Cold Charging
The SK48v100 battery is equipped with 6 temperature sensors – 4 of them measure the temperature of the cells, 1 measures the temperature of the high-power section of the BMS, and the final sensor is an environmental temperature sensor. These sensors are important for controlling the operation of the BMS, since charging in extreme cold is bad for the longevity of the cells. If any of the 6 sensors detect a temperature below -5°C (23°F), then the BMS will stop allowing charge to enter the battery, while simultaneously still allowing discharge to occur, if demands require discharging.
Extreme Cold Discharging
Contrary to charging, discharging in extreme cold does not present a risk to the cells quite like charging does. The battery can safely discharge down to -20°C (-4°F), although you may notice a reduced capacity (as much as 40% below its rating) and discharging at a voltage lower than normal. Once the battery returns to a normal temperature, this capacity will be restored and the voltage will cycle as expected. As strange as it may seem, if discharging in temperatures below 32°F, you may observe the voltage increasing as the battery is emptied. This is caused by the small amount of heat inside of the cells freeing up the flow of ions through the electrolyte inside the cells. Here is a very in-depth study in case you are interested: https://mdpi-res.com/d_attachmen….
Moisture / Humidity
As for most electronics, extreme humidity & condensation is not good for long term performance or integrity. Avoid environments that have condensing humidity and be especially cautious in locations near the ocean where salt spray may be present, as this can cause accelerated degreation that wouldn’t be covered by warranty.
The 5-slot racks are also not intended for excessive moisture. As an example, a basement with water running along the floor would be unsuitable for installing the battery rack, as this will lead to the bottom feet rusting out thus compromising the structural integrity of the rack.