Xantrex Technology 1000i Prosine Inverter Operation, Principles of Operation, Output Waveform

DC Grounding:

The Prosine Inverter has a lug on the rear panel labeled Chassis Ground. This lug is used to connect the chassis of the inverter to your DC ground as is required by regulations for some installations. Depending on where the Prosine Inverter is installed, follow the instructions below that correspond to your installation location.

Recreational	Use #8 AWG or larger copper wire (green if
Vehicle	insulated) and secure it to the chassis
Installations	ground lug as well as the grounding point in
	your vehicle (usually the chassis).*
Marine	ABYC's recommended practices require
	that the chassis ground wire have the same
Vessel	current carrying capacity (ampacity) as the
Installations	DC input cables. Using 90°C wire, the
	following wire sizes meet this requirement.**
	Model		Wire Size (AWG)
	1000/12 V	#6
	1000/24 V	#10
	1800/12 V	#2
	1800/24 V	#6
	The chassis of the Sine Wave Inverter must
Residential	be connected to the system's DC grounding
Installations	point. Use copper wire and secure it to the
	chassis ground lug and your DC ground
	point.***
	Model		Wire Size (AWG)
	1000/12 V	#6
	1000/24 V	#8
	1800/12 V	#4
	1800/24 V	#6

*Based on NFPA 70, article 551-20(c)

**Based on ABYC A-25 and E-9

***Based on NFPA 70, article 250-122 and 690-45

3. Prosine Inverter Operation

This section details how the unit functions as an inverter, provides information on the control panel, and describes operating limits for inverter operation.

3.1 Principles of Operation

The Prosine Inverter converts power from the batteries in two stages. The first stage is a DC-to-DC converter, used to raise the low voltage DC input to high voltage DC. The second stage is the actual inverter stage, taking the high voltage DC and converting it to a precise, true sine wave AC output.

The DC-to-DC converter stage uses modern high frequency power conversion technology that eliminates the bulky, low frequency (50/60 Hz) based transformers found in inverters using older technology. The inverter stage uses advanced power semiconductors that provide excellent overload capabilities.

Figure 5. Principles of Operation

3.2 Output Waveform

The AC output waveform of the Prosine Inverter is a “true sine wave” with typically 1% Total Harmonic Distortion (THD). Figure 6 illustrates the output waveform from the inverter. This waveform is nearly identical to your utility-supplied power and in some

cases where utility power is poor, the Prosine Inverter delivers cleaner, more precise AC power.

Figure 6. True sine wave output (120 V

AC Model)

There are many advantages of true sine wave over other wave forms delivered by other inverters:

•AC powered equipment is designed to operate with true sine wave. Many loads will perform better when connected to the Prosine Inverter.

•motor loads start easier

•reduced stress on surge protection circuitry within the equipment means potentially longer equipment life

Many advantages of true sine wave are also due to the absence of the sharp-rising edges of waveforms prevalent in either modified sine wave or square wave inverters. Some of these advantages are:

•reduced interference in audio or electronic equipment, especially those that use less complex internal power supplies

•significantly reduced in-rush current into capacitive loads and reduced stress on the output devices of the inverter, potentially lengthening equipment life

•motor loads generally operate cooler and quieter without the extra harmonic distortion generated by a modified sine wave.

Xantrex Prosine Inverter Owner’s Manual English 9