C) Excess Voltage Cutout; Overload Cutout - VOLTCRAFT NPI 150-12 Bedienungsanleitung

d) Low Voltage Cutout
The inverter switches off automatically as soon as the input voltage falls below the admissible range (see
technical data). This cutout is indicated by the "UVP" LED (9) (Under-Voltage-Protection) with alarm
sound in the 1000 W and 2000 W models, the "FAULT" (11) indicator with alarm sound indicates the
same in the 150/300 and 500 W models. If this LED lights up, switch the inverter off and increase the
input voltage. The low voltage cutout normally triggers when the batteries are empty. In most cases, it is
sufficient to recharge the battery.
e) Overload Cutout
The inverter cuts out automatically if there is an overload. An overload may occur through exceeding the
permanent output, overheating due to insufficient ventilation or a short circuit on the output. This cutout is
indicated by the "OVP" LED (8) (Over-Voltage-Protection) in the 1000 W and 2000 W models, the "FAULT"
(11) indicator shows the same in the 150/300 and 500 W models.
If this LED lights up, turn the inverter off and reduce the connection power and/or improve the ventilation
of the inverter.
General information about operating end devices on inverters
In principle, you can operate all 230 V end devices on inverters. However, in order to estimate the power
requirement and the corresponding reserves, it is important to know some properties of typical 230 V end
devices. Many 230 V end devices have a much higher startup output than the permanent output indicated
on the specifications plate. The startup output does not play a major role with mains operation, because the
corresponding power reserves are always available. However, the output of inverters is limited. They can
provide the peak load for a short time on order to provide the high startup output of end devices. If the start-
up output of an end device is higher than the peak load, the inverter is not suitable to operate this end
device. For example, an inverter for operating a small compressor driven refrigerator with a permanent out-
put of approx. 50W must have a peak load of 500W.
Further examples:
• Light bulbs approx. 1 sec. up to 8 times higher startup output
• Refrigerators approx. 3 sec. up to 10 times higher startup output
• TVs approx. 1 sec. up to 10 times higher startup output
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