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What is LBCO and How Should I Set it on My Off-Grid System?

What is LBCO and How Should I Set it on My Off-Grid System?

System Display Via Victron Phone App


Differentiating LBCO Settings for Lead Acid and Lithium Batteries

  • What is LBCO?
  • Differentiating LBCO Settings for Lead Acid and Lithium Batteries
  • Conclusion


What is LBCO?

LBCO, or “Low Battery Cut-Out,” is a critical component in inverters and battery management systems for off-grid solar setups. This setting establishes the minimum voltage at which the inverter disconnects from the battery automatically, preventing over-discharging.

When the battery voltage drops below the specified LBCO level, the inverter shuts off, safeguarding the batteries from potential damage and preserving their lifespan. This protective measure is indispensable for maintaining the health and longevity of off-grid solar power system batteries.

Users have the flexibility to adjust the LBCO setting based on their battery type, preferences, and system requirements. The aim is to strike a balance between utilizing stored energy efficiently and preventing harmful deep discharges. Optimizing this parameter is crucial for enhancing both the performance and lifespan of a solar power system.

In certain system setups with a solar array, if there’s sufficient sunlight to charge the batteries beyond the LBCO parameters, the system may switch back on. Each system is unique, and the LBCO setting serves as a vital safeguard against complete battery discharge.

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Differentiating LBCO Settings for Lead Acid and Lithium Batteries

Default Settings:

By default, the inverter is set to turn off if the battery voltage falls below 10.0 volts for 12-volt models. This acts as a safety measure to prevent complete battery drain.

Adjusting the LBCO Setting:

You can customize the LBCO setting based on your preferences and the type of batteries you have. The adjustment range depends on your specific inverter model.

Where to Set the LBCO for Different Batteries:

Determining the Low Battery Cut-Out (LBCO) setting for your off-grid solar system involves considering the type of batteries you have and your specific usage scenario. The LBCO setting is crucial to prevent over-discharging, which can impact battery life.

Lead-Acid Batteries:

For traditional lead-acid batteries (Flooded, GEL, AGM): Set the LBCO between 11.5 and 12.2 volts for 12-volt models. Adjust the LBCO within the recommended range for 24-volt and 48-volt models accordingly. Basically double for 24 and then double again for 48

Lithium Batteries:

Lithium batteries: Configure LBCO at a lower voltage, usually between 10.0 and 11.4 volts for 12-volt models. Scale the LBCO accordingly for 24-volt and 48-volt models, essentially doubling for 24 volts and then doubling again for 48 volts. While these are fundamental settings, it’s crucial to adhere to the manufacturer’s recommendations for optimal performance.

Consideration for Usage:

If you want to cycle your batteries slightly without discharging more than 20%, set the LBCO towards the higher end of the recommended range. For applications like off-grid homes or extended dry-camping in an RV where deeper discharges are acceptable, you might set the LBCO at a lower point. In extreme cases where you need to discharge the batteries more significantly (up to 80%) before recharging, set the LBCO at the lowest recommended level.

Monitoring and Adjustments:

Make use of a battery monitor for precise tracking. Monitor your battery voltage regularly and make adjustments to the LBCO as necessary, considering your observations and evolving usage patterns. Our inventory includes battery monitors compatible with various systems like Magnum, Outback, Schneider, and Victron. Feel free to if you’re interested in adding a battery monitor to enhance your system.

Automatic Generator Start (AGS):

If you have an Automatic Generator Start (AGS), set it to start at least 1.0 volts higher than your LBCO to prevent unexpected inverter shutdowns.


In conclusion, when setting the Low Battery Cut-Out (LBCO) for your off-grid solar system, it’s essential to consult your battery manufacturer’s recommendations for precise guidance. Additionally, closely observe your system’s performance in real-world conditions and make adjustments accordingly. Finding the optimal LBCO setting ensures a balance between maximizing battery lifespan and meeting your energy requirements. If you’re unsure about the best approach, consider seeking advice from a professional solar installer familiar with your specific setup. At IOTG Solar, we offer consultation services and provide the right devices tailored to your off-grid system needs. We’re here to support you every step of the way.

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