General Description - Western Co WRM30+ Manual Del Usuario

General description

WRM30+ is a PV charge controller for electrochemical lead sealed (SEAL), flooded lead acid (FLOOD) and lithium-ion
(LiFePO4) batteries. Is highly recommended to verify the features of the battery to make sure of the compatibility with
the charge controller. Lithium-ion batteries need to have integrated Battery Management System (BMS) so we
recommend to contact Western CO. to select the right lithium-ion battery to connect to WRM30+ charge controller.
It is absolutely forbidden to connect to WRM30+ lithium-ion batteries without BMS; the BMS protects the battery from
unsafe operating conditions that can lead to battery explosion or burning. If you connect the WRM30+ to batteries without
BMS you can risk the fire of the battery.
In pic. 1 there is a principle diagram of WRM30+.
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1 Charging circuit: it consists of two identical but distinct channels. It adapts VPAN and IPAN (respectively voltage and
current of the PV module) in order to search for the condition in which the power delivered by the PV module is
maximum, realizing what in the technical literature is indicated with the acronym MPPT (Maximum Power Point
Tracking). It also manages the battery charging reducing the current delivered to the battery in the conditions in which
the voltage Vbatt equals its charging voltage VEoC.
2 Parallel/Independent: this external connection
a separated one but on a single flap. With the external jumper the charge controller sees a single photovoltaic field
and distributes power equally between the channels. In a system with two slopes or in any case where you want to
maintain the channels independent, the jumper must not be inserted and the charge controller will search for two
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different MPPT .
3 Protections: The switches act as an anti-reverse battery protection and blocking diode. They avoid that during the
night, when the PV module is not illuminated, it can absorb current from the battery. Internal fuses provide an
additional degree of protection.
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4 Load: the load is power supplied with the same battery voltage and it is controlled through a semiconductor switch.
5 Microprocessor: it controls the whole circuit; it measures currents and voltages of PV modules, battery and load, and
it shows them on the display.
6 For a more precise detection of battery voltage and temperature, WRM30+ uses a sensor that have to be positioned
close to the battery terminals (the sensor is supplied: SPC20.S). It is important to connect this sensor to guarantee the
compensation in temperature of the end-charge voltage of the system (V
voltage independently of the drop voltage on cables. If you do not connect this sensor the system will work anyway
but the battery voltage will be measured on the internal terminals of WRM30+, while the compensation V
function of the temperature will not be performed and, prudently, the V
system detects a temperature 60°C. In the configuration with lithium battery, the compensation in temperature is
disabled.
WRM30+
User manual
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Pic. 1 Principle diagram
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must be inserted when you have either a single photovoltaic field or
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) and for the measurement of battery
EoC
will be set to the minimum value, as if the
EoC
EN
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in
EoC