Say No to “Inflated Specs”! SMTK Teaches You How to Accurately Calculate Battery Capacity

Does your street light go out in the middle of the night? It’s likely due to miscalculated battery capacity. The standard formula is: Battery Capacity (Ah) = (Lamp Power × Operating Hours × Rainy Days) ÷ (System Voltage × Depth of Discharge × 0.9). For example, a 30W lamp operating for 10 hours, needing to last through 3 rainy days, would require approximately 70Ah in a 12V system. The key here is the Depth of Discharge (DoD): gel batteries can only use 50%, while SMTK LiFePO4 Batteries, thanks to their smart BMS (Battery Management System), allow for 90% depth of discharge. This means that for the same runtime requirement, the nominal capacity of an SMTK battery can be 30%-40% smaller than a gel battery, not only saving on procurement costs but also reducing the load on the pole. Our batteries are factory-shipped with capacity grading test reports, eliminating the common market pitfall of “inflated Ah ratings.”