Cooling by forced air fan ventilation
The inverters produce heat when operating. The amount of heat produced is proportional
to the amount of power supplied by the inverter. DC fans are used to provide forced air
cooling of these inverters. The fans are thermostatically controlled and will be switched
on only if the temperature of certain hot spot inside the inverter rises above a certain
temperature.
At lower loads and / or at lower ambient temperatures, the fan may not
switch on at all. This is normal.
The units are protected against over-temperature due to
failure of the fan / inadequate heat transfer. The AC output will be shut-down if the hot
spot inside the inverter reaches a certain higher temperature.
Precautions when working with batteries.
- Batteries contain very corrosive diluted sulphuric acid as electrolyte. Precautions
should be taken to prevent contact with skin, eyes or clothing
- Batteries generate hydrogen and oxygen during charging resulting in evolution of
explosive gas mixture. Care should be taken to ventilate the battery area and follow the
battery manufacturer’s recommendations.
- Never smoke or allow a spark or flame near the batteries.
- Use caution to reduce the risk of dropping a metal tool on the battery. It could spark or
short circuit the battery or other electrical parts and could cause an explosion.
- Remove metal items like rings, bracelets and watches when working with batteries. The
batteries can produce a short circuit current high enough to weld a ring or the like to
metal and thus cause a severe burn.
- If you need to remove a battery, always remove the ground terminal from the battery
first. Make sure that all the accessories are off so that you do not cause a spark
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 17
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 33 VDC 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 33 VDC
- Do not use unregulated solar panels to charge a battery. Under cold ambient tempera-
tures, the output of the solar panel may exceed 36 VDC. Always use a charge controller
between the solar panel and the battery.
- Do not connect to a battery system with a voltage higher than 24 VDC nominal
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