Leonardo System 3000
Manuale installazione
Leonardo System 3000
Technical Manual
Rev. 1.0
14-05-2012
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WESTERN CO. Srl
- All rights are reserved - Reproduction and use of information contained within this document is forbidden without the written consent of
WESTERN CO.
Srl
5
t6
But if the energy coming from renewable source is less than load, the battery voltage slowly drops and when it
reaches a residual capacity of 20% (battery voltage 22V) you hear a beep;
t7
If the
load consumption
does not decrease, CPU switches the load
on
“Bypass Mode“ input line and the grid
battery charger is activated in order to help the restoring of the full battery state of charge;
t8
In case of blackout, the CPU goes back to “Inverter Mode” in order to use all the available energy inside the
battery, up to 10% capacity (battery voltage of about 21V), until the final shutdown which is signaled by the
display.
PV charge regulators - section
Leonardo System 3000 is equipped with
n.4 independent MPPT PV charge controllers
code WRM-15 suitable for
electrochemical sealed batteries (SEAL) or flooded lead acid (FLOOD). In fig. 1 there is a principle diagram WRM-15.
Fig.5
Principle diagram
of WRM-15
1-
Charging circuit of WRM15: it adapts V
PAN
and I
PAN
(respectively voltage and current of PV module) so to search
for the condition in which the power delivered by the PV module is maximum, thus realizing the MPPT
(
Maximum Power Point Tracking
). In addition, it manages the battery charge by reducing the current delivered
towards the battery when V
BATT
voltage exceeds its charge voltage (V
ch
).
2-
Series diode: it is used to avoid that during the night, when the PV module is not illuminated, it can absorb
current from battery.
3-
Circuit for load control: it turns on/off the load according to the program set by the user e it detaches the load
in case of low battery or overload or short-circuit on the load.
4-
Microprocessor: it controls the whole circuit, it measures currents and voltages of the PV module, of the battery
and of the load and it displays these measures on the display.
Choice of photovoltaic module
Each WRM-15 charge controller, thanks to the charging circuit with MPPT, allows to use a wide range of PV modules
ensuring the optimum exploitation of the whole power. The PV module has to be chosen according to the battery
nominal voltage and respecting the constraints of WRM15 panel input: 100V maximum voltage and maximum panel
power: 225W with 12V battery and 450W with 24V battery.
V
PAN
I
PAN
V
BATT
I
BATT
I
LOAD
MICRO -
CONTROLLER
1
2
3
4
MPPT
WRM-15
