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Need Voltage Regulators

  • Pakistan Pakistan  
  • Last Updated:
    Posted on: 18 Jun 2021

RFQ Details

We require charge controller of the following spec,
Photovoltaic Charge / System Controller
General: all specifications below are defined for systems with a nominal voltage of 12 V
a. The regulator or charge controller must protect the battery against overcharge and excessive discharge, besides giving information to users on the general state of the system (battery voltage, charging current and load current).
b. The charge controller must ensure safe and reliable operation in the whole range of ambient temperatures from -5 C to + 40 C.
c. The load voltage disconnect (LVD) must respect the established limits for the maximum discharge depth (PDmax) of the battery (80%). Regardless of this condition, it should never be lower than 11.4 V.
d. Load disconnection must take between 5 and 30 seconds as from the moment on which the disconnection voltage is achieved.
e. The load voltage reconnect must be between 0.9 and 1.2 V higher than the disconnection voltage referred to in the previous specification.
f. The alarm voltage must be 0.2 V higher than the disconnection voltage.
g. The disconnection, reconnection and alarm voltages must have a precision of at least 0.5% (60 mV), and must remain constant in the whole range of possible operation temperature.
h. The final charge voltage (high voltage disconnect, HVD) must be 14.4 V for tubular battery. These values are to be interpreted at 25 C. The thresholds must be compensated in temperature, at the rate of between -20 to -30 mVC
i. The final load and replacement voltages must have a precision of at least 0.5% (60 mV)
j. The improved algorithms of load regulation (for example of controlled overcharge followed by a
flotation phase) are accepted if they are time controlled.
k. The charge controller shall not use electro mechanic relays.
l. The charge controller shall use a pulse with modulation (PWM) strategy to control the charging
current.
m. Maximum current draw of the controller should not exceed 10 mA.