10
4 Operation
4.1
PWM Technology (Series Pulse Width Modulation)
The controller adopts the advanced series pulse width modulation (PWM)
charging mode. With range of 0-100%, it can charge the battery quickly and
stably under any condition of solar photovoltaic system.
PWM charging mode use automatic conversion duty ratio pulses current to
charge the battery. The battery can be fully charged safety and rapidly with
the pulse current. Intermissions make some oxygen and hydrogen generated
by chemical reaction chemically combined again and absorbed. It can
eliminate concentration polarization and ohm polarization naturally and
reduce the internal pressure of the battery so that the battery can absorb more
power. Pulse current charging mode makes battery have more time to react,
which reduces the gassing volume and makes battery improve the
acceptance rate of charging current.
4.2 Battery Charging Information
Figure 4-1 PWM Charging mode
·
Bulk Charge
In this stage, the battery voltage has not yet reached boost voltage and 100%
of available solar power is used to charge the battery.
·
Boost Charge
When the battery has recharged to the Boost voltage setpoint, constant-
current regulation is used to prevent heating and excessive battery
gassing.The Boost stage remains 120 minutes and then goes to Float Charge.