1100 Watt Inverters – True Sine Wave (XP Series)
XP Series Inverters
Exeltech’s XP series inverters provide the cleanest, best regulated sine wave output over the widest DC input of any inverter on the market today. They are extremely low in Total Distortion—specified to 2%, and typically better than 1.5%. Total Harmonic Distortion is typically 0.8% to 0.9%. Remaining distortion is a result of residual switching noise, which amounts to a very clean 25 KHZ sine wave superimposed on the fundamental output. No significant harmonics of 25 KHZ exist. This spectral purity will exist over the inverter’s entire operating envelope, including non-linear and reactive loads. As long as peak output current remains less than 300% of rated current, total harmonic distortion will remain within the 2% specification. Peak current capability of the inverter is key to understanding its operational envelope. As long as the inverter is supplying less than this amount, it will function properly and virtually operate any load.
Many inverters are rated in Volt-Amps (VA), as opposed to Watts. This is in an attempt to make an inverter or UPS (Uninterpretable Power Supply) appear larger than it really is. The only fair way to specify these products is in Watts (W), which is power the inverter can actually deliver. If Exeltech inverters were specified in VA, Our 1100 Watt inverter could be rated at 1375 VA at .8 power factor, 570 VA @ .7 pf, or an incredible 2200 VA @ .5 pf. It is confusing to specify a product in VA because the power factor must also be specified. Exeltech’s XP-Series inverters can output their full rated power continuously at 30 C° (86 F).
The inverter can maintain a spectrally pure output with any load, due to a specially designed non-linear control loop in the primary DC to DC converter. This circuitry is one of three circuits which protect the inverter from any overload condition.
XP-600, XP-1100, and XP-2000 Inverters
XP-600, XP-1100, and XP-2000 inverters can supply twice their rated output power for three seconds to start motors or supply in-rush currents to electronic loads. If output power is exceeded for greater than three seconds, output voltage is reduced to a level which will provide the inverter’s rated power to the load by clipping tops of the wave form. The inverter can indefinitely and safely operate in this mode. Exeltech’s XP-Series inverters can output their full rated power continuously at 30° C (86° F). The inverter is derated 20% of its full power for every 10° C over 30° C. In other words, 80% of normal capacity at 40° C, 60% at 50° C, etc.
DC INPUTS: Positive (+) and Negative (-) input terminals are 3/8″ studs with brass hardware. They are accessed under the rear cover. Use “Appendix A” to choose the appropriate gauge wire for your specific model.
REMOTE ON/OFF: Provides the user with a remote method to turn the inverter on and off. “REMOTE” connection is on the barrier terminal strip located under the rear cover.
AC OUTPUTS: All domestic models have two NEMA – 15 outlets (standard wall receptacle), and NEMA -Wd6 outlets (T slot, 5-20 Rreceptacle) on XPX. These are located on the front panel of the unit. XP-600, XP-1100 and XP-2000 230 VAC inverters will have an IEC-320 receptacle located on the front panel. Additionally, the unit may be hard-wired to appliance/load using connections on the barrier terminal strip, located under rear cover.
COOLING: Provided by a thermostatically controlled brushless fan located on the front panel.
DC POWER ON LED: Located on the front panel; will be “ON” when inverter is powered up, and DC power is available.
LOW BATT/THERM BUZZER: Produces an audible alarm if DC input voltage falls to a level within 2% to 4% of the low limit of inverter, or, if there is an over-temperature condition.
ON/OFF SWITCH: Located on front panel; turns the inverter on and off.
OVER VOLTAGE PROTECTION: When input voltage to the inverter exceeds set limits, the inverter will immediately shut off, without warning. When input voltage returns to normal range, the inverter will immediately restart. Since high over-voltages tend to have very fast edges, the inverter must shut down quickly to protect itself. This kind of fault usually occurs if the battery is suddenly disconnected from the system and the battery charger continues to supply current.
UNDER VOLTAGE PROTECTION: When battery voltage falls to within 2% to 4% of low line voltage, the LOW BAT/THERM buzzer will sound. If the condition continues without reducing load to the inverter or adding charge to the battery, the inverter will shut off. When voltage rises to approximately 85% of nominal battery voltage the inverter will turn back on and the alarm condition will clear. The inverter can be manually reset by cycling the on/off switch. This will reset the protection circuit and turn the inverter on at any voltage above minimum voltage.
OVER TEMPERATURE PROTECTION: The inverter is also protected against overheating. It will provide its full rated output up to the temperature listed in the specification sheet. If it is subjected to higher ambient temperatures or air circulation is blocked, the inverter could overheat. If the LOW BATT/THERM buzzer sounds, immediate action is required or the inverter will shut down. Either reduce load, or provide more cooling in the immediate environment. If no action is taken, the inverter will likely shut down within two minutes. When the inverter shuts down, the alarm condition will persist and the cooling fan will continue to run. Since the inverter has eliminated its load, it will quickly cool. The inverter will automatically restart when it has cooled sufficiently, and the LOW BATT/THERM alarm will clear.
OVERPOWER, SHORT CIRCUIT PROTECTION: XP600/1100 inverters have three levels of overpower protection. The first limits peak instantaneous current. The second system limits absolute power coming from the module. Both of these circuits act to reduce output voltage as required, to limit current to a safe level. The overpower protection circuit will recover instantly when the overpower condition clears. The third is short circuit protection. If the overcurrent condition is so severe that it causes output voltage to collapse to 1 Vp for more than one second, the inverter will shut down and not automatically restart. This requires the user to clear the short circuit safely, and guarantee that hazardous voltage will not come back on line until desired. To reset the inverter from this condition, cycle power switch “OFF” then “ON” again.