Lithium iron phosphate battery coulomb meter power display module

The coulomb meter high precision allows the monitoring of the voltage (V), the capacity (Ah), the power (W) and the energy a battery. This information allows the user to get a State of charge in % (SoC) or a depth of discharge (DoD) says the battery. It calculates in real time the remaining time until the battery is completely empty.

Shows detailed battery bank information at the push of a button without the need of system configuration and calibration. The Renogy Monitoring Screen for Smart Lithium Battery Series is a high precision meter designed for Smart Lithium Iron Phosphate Batteries in off-grid energy storage systems.

However, calibrated charge indicators can be used specifically for lithium-ion batteries in general and lithium iron phosphate batteries in particular. A precise measurement, coupled with a modelled load curve, allows SoC measurements to be obtained with an accuracy of 10 to 15%.

There are several ways to get Lithium-Ion State of Charge (SoC) measurement or Depth of Discharge (DoD) for a lithium battery. Some methods are quite complicated to implement and require complex equipment (impedance spectroscopy or hydrometer gauge for lead acid batteries).

For applications using batteries, the situation is often critical if users are suddenly without energy (for example electric bicycles, security cameras, alarms, IoT, on-board sensors…). In these cases, the accuracy of a Coulomb Counter for batteries State of Charge measurement is a “must have”.

However, Lithium-ion batteries have a much flatter discharge curve, which means that over a wide operating range, the voltage at the battery terminals changes very slightly. Lithium Iron Phosphate technology has the flattest discharge curve, which makes it very difficult to estimate SoC on a simple voltage measurement.