10
4 Operation
4.1
PWM Technology (Series Pulse Width Modulation)
The controller adopts the advanced series pulse width modulation. With
range of 0-100%, it can charge the battery quickly and stably under any
condition of solar photovoltaic system.
The operating principle of PWM charging mode is as follows:
The battery is firstly charged with pulse current and recharged after it stops
charging for a while. It is repeated in this way for several times till the
battery is fully charged. Intermissions allow some oxygen and hydrogen
generated by chemical reaction can be chemically combined again and then
absorbed, which can eliminate concentration polarization and ohm
polarization naturally, and reduce the internal pressure of the battery.
Consequently, it makes next charging smooth and the more power is charged
to the battery. Intermittent 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-voltage regulation is used to prevent heating and excessive battery
gassing.The Boost stage remains 120 minutes and then goes to Float Charge.
Summary of Contents for LS1024R
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