Charge Controllers play the most
important part in PV systems as they decide the conditioning of raw power
from solar panels. These are normally available in two modes of operation,
Series and Shunt. There are distinct advantages of both the types. In
smaller power system, Shunt versions are found to be efficient and
cost-effective. Whatever be the mode of control, these can be either
simple on-off type with panel disconnect and reconnect set points or the
latest PWM type. The later is found to be extremely efficient in
maintaining SOC and life of battery. See
of PWM CHARGING .
By default, all our Charge controllers
are of PWM type. On-off versions are available on request.
In higher capacity versions,
temperature compensation is provided for better charging of the battery.
While charging, battery should not be over-charged and while discharging
(supplying current to the loads) it should not be deep discharged. To have
these protections, all our controllers come with presets provided on kits
to fine tune the requirement depending upon the application and type of
battery used. Additional protections against reverse current flow from
battery to panel during night, reverse connection of battery or panel and
overloads at output are all provided as standard feature.
Some controllers come with built-in
LED drivers as well. For systems using LEDs as lighting source, these
controllers are cost effective and easy to implement balance of system.
This is especially useful for LED based solar street lights.
The charge controllers are available
with Dusk to Dawn operation with programmable auto-dimming after a preset
time. The time delay for dimming and percentage of dimming can be set as
per requirement. This feature saves on cost of panel and battery in
stand-alone LED based solar street lighting systems.
To have better efficiency, the drop
between PV panel and Battery while charging should be negligible. So also
the drop between battery and load while battery being used to supply the
power to the load. Additional, quiescent current (NLC) of the
controller should be extremely small as it is continuous drain on battery.
All our controllers, by default, use MOSFETs with totally circuitry have
the lowest quiescent current.
For OEMs, we have all the kits in
ready to use form. The kits has easy interconnection features to make
connections to Panel, Battery and Load. Terminals and relimates are
provided everywhere so that no soldering is needed to implement BOS.
Replacement of kit can be done by any non technical person as plug and
play arrangement is found everywhere.
Some standard kits are available in
moulded housing to be used directly as independent unit.
Taking into the need of the hour,
most of our controllers come with MOBILE CHARGING output as well. Mobile
charging cricuitry provided on board is of smps type with controlled
charging current and full protections against short circuits. The mobile
sets are thus fully protected against any overcharge while kit efficiency
is maintained high.