PV Charge Controller

We require charge controller of the following specs

 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 mV/癈
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.
n. The connection terminal must easily admit cables with a section of minimum 6 mm2. In case the
current to be managed is higher than 10 A, the corresponding terminal must easily admit cables with
a section of 10 mm2.
o. The charge controller boxes must offer a protection of at least IP 22.
p. The regulator must be protected from polarity inversions in the lines of the generator and of the
battery.
q. The charge controller must prevent reverse current into the PV module during night
r. The regulator must resist, without any damages, any possible condition related to operation of the
battery. In particular, it must resist when there is no consumption in the load and the voltage in the
generator terminals reaches 26 V.
s. The regulator must protect the loads against damaging related to operation without a battery.
t. The regulator must be protected from excessive tensions induced by atmospheric discharges through
transitory suppression devices.
u. The regulator shall disconnect the load above the rated current and shall be protected at least for
currents higher than 110% the rated current.
v. The acoustic noise coming from the regulator must be lower than 35 dbA, as measured at a distance
of one meter.
w. The regulator should not produce any interference, either radiated or conducted, in the radio
frequencies: AM 530kHz 1600 kHz; SW1: 2.3 MHz 7 MHz; SW2: 7 MHz 22 MHz, and in any
operating condition.
x. The regulator must include, as a minimum, the following signs:
a. Charging mode
b. State of battery: charged, half full and empty
c. Alarms: short circuit, excessive current, excessive voltage and load disconnect.
z. The load regulator must have a certificate of compliance, issued by any of the listed laboratories one
of the following standards:
aa. Recommended Specifications PVRS 6/6A of the Photovoltaic Global Approval Program-PVGAP.
bb. Universal Technical Standard for Solar Home Systems - Thermie B: SUP 995-96, ECDGXVII, 1998.
Version 2, revised 2001.