Quick Answer
Investing in lithium batteries for emergency backup power can be a worthwhile investment for those who frequently experience power outages. Lithium batteries offer a reliable and efficient way to store energy for critical loads. However, proper sizing and management are crucial for optimal performance.
Understanding Lithium Battery Depth of Discharge
Lithium batteries, particularly lithium-ion and lithium-iron-phosphate, have a recommended depth of discharge (DOD) to maintain their lifespan. A DOD of 50% or less is generally recommended for most lithium batteries. This means that if a 12V 200Ah lithium battery is used, it’s recommended to keep the state of charge (SoC) between 50% and 90% (200Ah x 0.5 to 0.9). Avoiding deep discharges can extend the battery’s lifespan by up to 50%.
Sizing Lithium Batteries for Emergency Backup Power
To determine the required battery bank size, calculate the total energy demand for critical loads during an outage. For example, a refrigerator might require 100Wh/h, and a medical device might require 20Wh/h. Add these together to get the total energy demand (120Wh/h). Then, divide the total energy demand by the battery’s capacity (e.g., 12V 200Ah battery) to get the required runtime (600Wh / 200Ah = 3 hours). This will help you determine the necessary battery bank size for your specific needs.
Find more answers
Browse the full Q&A library by topic, or jump back to the topic this question belongs to.