U-Charge Rt Power Ystem Eatures; Discharge Control - Valence RT User Manual

Figure 6.
Example for charging 4 U-Charge
•
Charge to 58.4V = (14.6V x 4 batteries in series) and hold.
•
When voltage reaches 58.4, the battery is approximately 90% charged.
•
Allow the current to naturally decay when voltage is reached.
•
When the current drops below 2A for U1, 5A for U24, and 6A for U27, the battery is
considered 100% charged.
•
Continue to float charge at 58.4V.
•
It will not hurt the battery if the voltage is continuously present, even after 100% SOC
is reached. This will aid in balancing.
If you have any questions, please call Valence Technology for the recommended charging profile
for your system.
If a U-BDI is attached, the 10 bar LEDs will light up according to the system's state of charge.
Once any cell has reached 3.65V, the yellow LED will illuminate. This is normal and is just
telling the user that balancing has started to occur.
®
7. U-C RT P
HARGE
®
The U-Charge RT power system includes electronics that monitor conditions of the battery pack.
• Built-in electronic monitoring for state-of-charge, current, voltage and temperature
• Built-in and automatic over voltage, over temperature and over discharge protection
• Internal cell balancing
• LED battery status indicator
• Series connection up to 48V (nominal) maximum system voltage
• Rugged mechanical design – dust and water resistant to IP56 standards, flame retardant
plastics
• Handles on U24, and U27 models
• Hundreds of cycles, under normal conditions
• Maintenance-free
• Can be recharged using most standard lead-acid chargers (set for AGM/GEL cells) *verify
with Valence Customer Support before charging
• Communication of monitored data via optional RT Monitoring Kit (part number 1004236)
• State of charge displayed via U-BDI (part number 1002867)

7.1 Discharge Control

When the modules are discharged to the point where any single cell block reaches its minimum
value, 2.45V, the battery will interrupt discharge. The battery will appear to have 0V (or even
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Email: sales@valence.com, Web site:
®
batteries:
S
OWER YSTEM
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F
EATURES
Performance may vary depending on, but not limited to cell usage and application.
If cell is used outside specifications, performance will diminish. All specifications
are subject to change without notice. All information provided herein is believed,
but not guaranteed, to be current and accurate. Copyright © 2005-2008 Valence
Technology, Inc.
Revision Date October 2008