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In order to provide grid services, inverters need to have sources of power that they can control. This could be either generation, such as a solar panel that is currently producing electricity, or storage, like a battery system that can be used to provide power that was previously stored.
In a large-scale utility plant or mid-scale community solar project, every solar panel might be attached to a single central inverter. String inverters connect a set of panels—a string—to one inverter. That inverter converts the power produced by the entire string to AC.
Grid-forming inverters can start up a grid if it goes down—a process known as black start. Traditional “grid-following” inverters require an outside signal from the electrical grid to determine when the switching will occur in order to produce a sine wave that can be injected into the power grid.
Predominantly, the batteries used in forklifts are deep-cycle lead-acid batteries. They're designed to provide a steady amount of power over a longer time. Rather than delivering short bursts of high energy, which makes them theoretically suitable. This is most true for applications like solar energy storage.
In contrast, repurposed forklift batteries, are obtainable at a fraction of the cost. While this sounds enticing, it's essential to factor in longevity and maintenance costs. A forklift battery that needs frequent upkeep or replacement sooner than a solar battery would negate initial savings. Safety is paramount when dealing with electrical setups.
Lithium-ion forklift batteries last longer than lead-acid batteries. Whereas a lead-acid battery might last 1,500 cycles under good maintenance, a lithium forklift battery lifespan can last between 2,000 and 3,000 cycles. Lithium-ion forklift batteries are more expensive than lead-acid.
So, once the battery is plugged into the charging system, the BMS ensures that it charges safely. Lithium forklift batteries are virtually maintenance-free. They don’t require constant watering, equalization charging, or cleaning. But they’re not completely “set and forget” either. Here’s a simple lithium forklift battery maintenance checklist:
