Xantrex RM1012 User Manual download pdf (Page 15)

Planning for AC loads

2–3

DC loads

DC loads are those that run off the 12 V electrical system on the truck. A

few examples of DC loads are:

• marker lights, headlights, cab lighting, other lights using DC power

• DC refrigerators

• CBs

• factory-installed radios or sound systems

DC loads and the inverter/charger both rely on the batteries for power.

Many DC loads running at one time will shorten the operating times of

AC loads.

Problem loads

These are loads you should not operate from inverter/charger because

they may be damaged or may not operate properly:

• dimmer switches

• some small rechargeable hand power tool chargers

• small battery-operated appliances such as flashlights, razors, night

lights

• variable speed motors

Ambient temperature

Ambient

temperature

The ambient temperature, that is, the air temperature around the

inverter/charger will affect its output power.

The air temperature around the inverter may be much hotter than away

from the vehicle. If your truck is standing on hot pavement, the

temperature may be quite high near the inverter.

Temperature

and power

Generally, the output power decreases as the temperature increases. For

example, at 77 °F (25 °C) the unit delivers 1000 watts for as long as you

have sufficient battery power. At 104 °F (40 °C) it delivers 1000 watts for

up to 10 minutes before shutting down or 750 watts continuous, or 2000

watts for 2 1/2 minutes.

Figure 2-1 shows the relationship between ambient temperature and the

length of time the unit will supply an output power level. Choose the

curve with temperature range most closely approximating that of the

inverter/charger location, then look for the time in minutes. The

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Xantrex RM1012 User Manual Page 15