03-30-2024, 01:39 PM
Hey Tom, glad that worked out for you with the 100Ah pack. I'd be interested to see the power draw it pulls while going up. While these are high-drain cells, we typically recommend continuous loads of no more than 50% of rated capacity (50a for these 100Ah cells, as an example).
In general, LFP will spend 80% of its depth of discharge (DOD) at 3.2v per cell. We recommend setting cutoff at or just above 3.0v per cell, since you lose very little capacity. Similarly, we recommend setting float to 3.4v/cell and bulk/absorb to 3.5v/cell. Equalize is not required, but you can fully charge to 3.6v/cell periodically; the battery management system (BMS - red box in Tom's battery photo above) will slowly top balance by burning off energy from the highest-voltage cells. This is only required if cells become imbalanced. We're more conservative than other manufacturers simply because we test and renew the cells from other applications (typically forklifts), which leads to inherent but small imbalances in the system. Limiting to 80% also extends battery life considerably.
I've attached our (51v) charging recommendations, along with a graph showing the general (12v) voltage curve of LFP vs. lead acid. I'm happy to answer any other questions.
In general, LFP will spend 80% of its depth of discharge (DOD) at 3.2v per cell. We recommend setting cutoff at or just above 3.0v per cell, since you lose very little capacity. Similarly, we recommend setting float to 3.4v/cell and bulk/absorb to 3.5v/cell. Equalize is not required, but you can fully charge to 3.6v/cell periodically; the battery management system (BMS - red box in Tom's battery photo above) will slowly top balance by burning off energy from the highest-voltage cells. This is only required if cells become imbalanced. We're more conservative than other manufacturers simply because we test and renew the cells from other applications (typically forklifts), which leads to inherent but small imbalances in the system. Limiting to 80% also extends battery life considerably.
I've attached our (51v) charging recommendations, along with a graph showing the general (12v) voltage curve of LFP vs. lead acid. I'm happy to answer any other questions.
We are a sustainable energy solutions company that maximizes the useful life of energy storage systems. We've developed a proprietary renewal process to assess lithium-ion batteries for continued use in stationary applications.