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Case study
Powering efficiency:

Resolving overcharging challenges for sustained savings in Lagos bank

Rooftop Solar Power


A trial was conducted to optimize a 48V battery system at a bank branch in Lagos, installed in August 2023, facing challenges due to overcharging. The system consisted of 24 x 2V 1000Ah VRLA cells, with an average depth of discharge of 60% and an operating temperature of 30°C.


Identify and rectify issues related to overcharging, aiming to improve battery lifespan, reducing operational costs, and enhance system efficiency.


The charging profiles of the battery bank was analysed, focusing on the prolonged charging at 2.35Vpc. Ongoing monitoring and voltage regulation were recommended to prevent overcharging. The trial included assessing total energy throughput, discharge cycles, and operational temperatures.


The analysis uncovered overcharging issues, risking reduced battery life, thermal runaway, dry out, plate corrosion, increased maintenance costs, and environmental impact. Daily energy losses due to overcharging were calculated at 6.2kWh.

Action Taken

Mitigation steps were proposed, emphasizing voltage regulation and ongoing monitoring. Adjustments to charging settings were recommended to align with manufacturer specifications, preventing overcharging.



Implementing the suggested changes resulted in extended battery life, projected at 4 years as opposed to 2.5, and reduced energy consumption. Daily savings of $7.12 were estimated, with a return on investment of the system in just 48 days. 

Explore the insights

Lagos Bank Overcharging Photo 01

Battery remaining at 2.35vpc, which continues after the battery reaches a full charge. Detected average voltage across 2 x 2v batteries at 2.51vpc when average battery vpc is 2.40vpc. This indicates individual battery voltages up to 2.62vpc


On average the DoD is 60%.

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