Electric vehicles have specific requirements of their batteries that differ from the requirements of the stationary energy storage used in powering homes and businesses.
While powering a small runabout or an electric sports car or public transport the capacity of a battery reduces slowly. This means that batteries used in mobility applications (like EVs) need to be replaced when their youthful vim and vigor starts to decline. This is like a professional sports star retiring at 25 or 30 from their professional playing career in athletics, football, rugby, cricket or tennis. At this point the surge current drawn in the first few milliseconds during acceleration from the battery pack is higher than the battery can comfortably supply and the range of the car begins.
At this point, our professional player or our Electric Vehicle Battery needs a new career, a 2nd life.
In each vehicle is a Battery Management System (BMS) which ensures the delivery of battery power according to the demands of driving the vehicle. In each home or business powered by batteries, there is a BMS which ensures delivery of battery power according to the needs of that home or business. There comes a time in every battery’s life when it needs to leave the EV and that managers demands and move to a stationary energy storage system with different demands. The stationary solutions powering homes and businesses place gentler power demands on batteries than the systems powering EVs.
In backup power applications, they are used only when the main source of power goes down (which admittedly in South Africa may be very often). Batteries can deliver backup power without the mess and noise of your diesel generator too. As part of your Solar or Wind system, they can store the energy produced when it is produced and keep it ready to supply when it is needed (often at night).