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ES771A Remote Mid-String Voltage Monitor Module
The ES771A remote mid-string voltage monitoring module is used to measure the mid-string voltages
of up to three strings of batteries. This unit utilizes an appropriate QS873A VT-Probe connection to
obtain the voltage for measurement. It then serially transmits the appropriate information to the
system controller which performs the voltage imbalance detection feature. It also serves as interface
that transmits the thermal data from the VT-Probes for slope-thermal compensation and other battery
management features. As with the QS873A VT probes, ES771A units also utilize Maxim’s industry
standard 1-Wire® bus. Thus, multiple ES771A devices can be used and placed in a daisy chain fashion
along with the QS873A VT probes. The number of Mid-string voltage modules actively hooked to
batteries and being monitored by the system controller to batteries is displayed under Batteries in the
Status menu. Note: VT-Probes must be connected to the batteries in order for the ES771 to be
recognized.
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