Determine the LVFU battery capacity based on the load power and energy consumption

When designing LVFU battery capacity, engineers prioritize the load conditions as the main reference factor. They must also consider the battery’s charging and discharging capacity, the maximum power of the energy storage system, and the load’s power consumption duration.

Understand the difference between the battery’s theoretical and actual capacity

Battery manufacturers usually indicate the theoretical capacity in the manual. This represents the maximum power the battery can release when it discharges from SOC 100% to SOC 0% under ideal conditions. In real-world applications, engineers limit the discharge depth to protect battery life and set a reserve protection level instead of allowing it to reach SOC 0%.

Lvfu Battery capacity selection

In practical applications, engineers must carefully evaluate battery usage. When the photovoltaic system has a small capacity or the load consumes high power, the battery may not fully charge, leading to energy waste. Because of process losses, the battery’s discharge capacity is lower than its storage capacity, and the load’s actual power consumption is lower than the discharge capacity. Failing to account for these efficiency losses can result in insufficient battery power.