Victron energy BlueSolar SCC010005000, Manual

Page: 15 / 122

4. Operation
4.1 PWM Technology (Series Pulse Width Modulation)
The controller features advanced series pulse width modulation.
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/absorption Charge
When the battery has been recharged to the Boost/absorption voltage setpoint,
constant-voltage regulation is used to prevent heating and excessive battery
gassing. The Boost/absorption time is 120 minutes

Float Charge
After the battery is fully charged in the Boost/absorption voltage stage, the
controller reduces the battery voltage to the Float voltage set point. The purpose
of Float stage is to offset the power consumption caused by self consumption and
small loads in the whole system, while maintaining full battery storage capacity.
In Float stage, loads can continue to draw power from the battery. In the event
that the system load(s) exceed the solar charge current, the controller will no
longer be able to maintain the battery at the Float setpoint. Should the battery
voltage drop below the Boost setpoint, the controller will exit Float stage and
return to Bulk charge.