The Comba Battery Backup (BBU) is designed to provide reliable DC backup power for the duration of its rated Amp Hour specification with runtimes of 12 to 24 hours to satisfy local codes.

When an extended commercial power outage occurs, e.g. natural disaster event, the Comba BBU is designed to release the DC load after a preset timeframe (low voltage cutoff) to maintain the integrity of the equipment being backed up and the LiFePO4 battery.

The LiFePO4 battery has an onboard battery management system that monitors the health and operation of the battery. During an extended loss of commercial AC power, the Comba BBU and LiFePO4 battery will run until its low voltage threshold is reached. Majority of the time, this is well beyond the calculated Comba BBU uptime for the total equipment load.

Once the LiFePO4 battery low voltage threshold is achieved, the battery management system will disconnect the positive and negative battery terminals from the Comba BBU charger/controller and equipment load, thus shutting off the Comba BBU.

The LiFePO4 battery low voltage disconnection circuit is designed to:

1. Protect its internal cells from damage during an extended commercial power outage
2. Fully recharge the LiFePO4 battery when commercial power has been restored
3. Protect the Comba BBU equipment loads from a low DC voltage

To remedy this shutdown condition, please see the attached Comba Application Note with step-by-step instructions:

Application Note – Comba BBUs with LiFePO4 Battery & Extended Commercial Power Outages

As always, thank you for choosing Comba as your solutions provider to keep you connected. 

If you have further inquiries or in case you want more information about our products, please feel free to contact us at: marketing@combausa.com.