DC SIDE CONNECTIONS
The DC input power to the inverter is derived from deep cycle batteries of the required
capacity. Read under
“Specifying Batteries, Chargers and Alternators” on page 14
for details on sizing and charging of batteries.
Preventing input over voltage
It is to be ensured that the input voltage of the inverter does not exceed 16.5 VDC
(for 12V version or 33 VDC (for 24V version) to prevent permanent damage to the inverter.
Please observe the following precautions:
- Ensure that the maximum charging voltage of the battery charger / alternator / solar
charge controller is below 16.5 VDC ( for 12V version) or 33 VDC ( for 24V version).
- Do not use unregulated solar panels to charge a battery. Under cold ambient temperatures,
the output of the solar panel may exceed 18 V for 12V system or 36 V for 24V system.
Always use a charge controller between the solar panel and the battery.
- When using Diversion Charge Control Mode in a charge controller, the solar / wind /
hydro source is directly connected to the battery bank. In this case, the controller will
divert excess current to an external load. As the battery charges, the diversion duty
cycle will increase. When the battery is fully charged, all the source energy will flow into
the diversion load if there are no other loads. The charge controller will disconnect the
diversion load if the current rating of the controller is exceeded.
Disconnection of
the diversion load may damage the battery as well as the inverter connected to the
battery due to high voltages generated during conditions of high winds (for wind
generators), high water flow rates (for hydro generators) or cold temperatures
(for solar panels). It is, therefore, to be ensured that the diversion load is sized
correctly to prevent the above over voltage conditions.
- A series type of charge controller connects the solar / wind / hydro charging source
directly to the battery through the series connected switching MOSFET(s). The battery is
a capacitive type of load and will thus, dampen the input voltages of the charging source
due to its capacitive loading effect. As the inverter is connected to the battery bus,
it will see the voltages of the charging source as conditioned by the battery.
Please ensure that the inverter is connected to the battery bus only after the battery
is connected to the battery bus or the inverter is disconnected from the battery
bus first before removing the battery from the battery bus. If the inverter is
connected to the battery bus without the battery connected to the battery bus,
the inverter will be fed with the high open circuit voltages from the solar / wind /
hydro and will damage the inverter permanently.
- Do not connect the inverter to a battery system with a voltage higher than the rated
battery input voltage.
Preventing reverse polarity on the input side
When making battery connection on the input side, make sure that the polarity of battery
connection is correct (Connect the positive of the battery to the positive terminal of the
inverter and the negative of the battery to the negative terminal of the inverter). If the input
is connected in reverse polarity, DC fuse(s) inside the inverter will blow and may also
cause permanent damage to the inverter
page 19
Содержание PST-15S-12E
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