6
INTRODUCTION
1.4
MPPT Operation Description
This simple real world illustration (above) shows how the MPPT functions during the course of a day
as well as a simple schematic (below). In the morning, as soon as the MPPT detects that the Panel
Voltage is at a useable level (MPPT charge entry voltage);
Boost Mode
–
The MPPT starts to charge the batteries at maximum efficiency in a BOOST mode at
an adjustable nominal voltage of 14.5V per 12V battery bank.
Equalise Mode
-
If however the batteries are detected to not be uniformly discharged, the MPPT will
go into EQUALISE mode to restore battery bank balance before switching to BOOST mode as its
primary charge mode. The MPPT maintains this mode until the batteries reach the boost voltage and
the charge current decreases to a level below an adjustable nominal change level of 6 Amps.
Float Mode -
The MPPT then steps down the charge voltage to an adjustable nominal voltage of
13.8V per 12V battery bank in FLOAT mode. The MPPT will attempt to maintain FLOAT mode for as
long as the panel voltage is present.
Sleep Mode -
If no panel voltage is present, the MPPT goes into a sleep state until it detects a rise in
panel voltage indicating a new day for charging.
