Proper Float Voltage Selection

This month's blog addresses the topic of float voltage (float charge) selection for stationary batteries. In addition to setting this important operating parameter's actual value, I'll also discuss the best way to measure it and why. There are misunderstandings on both topics. I'll address this as it relates to lead-acid batteries employed in standby (full float) service such as UPS, telecommunications, switch gear and control, etc. First, let's officially define float voltage, aka, float charge. According to IEEE 1881-2016 (IEEE Standard Glossary of Stationary Battery Terminology) float charge is defined as "A constant-voltage charge applied to a battery to maintain it in a fully charged co

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