13
Nothing Comes Close to a Cobra
™
12
Power Consumption
•
For each piece of equipment you will be operating from
the inverter, you must determine the battery’s reserve
capacity (how long the battery can deliver a specific amount
of current – in automotive batteries, usually 25 ampere) or
ampere-hour capacity (a measure of how many amperes a
battery can deliver for a specified length of time).
Example – Reserve capacity: a battery with a reserve
capacity of 180 minutes can deliver 25 ampere for 180
minutes before it is completely discharged.
Example – Ampere-hour capacity: a battery with an
ampere-hour capacity of 100 ampere-hours can deliver
5 ampere for 20 hours before it is completely discharged.
To determine the battery ampere-hour
capacity you require:
1. Determine how many watts each piece of equipment
consumes. This can normally be found on the product
label. If only the current draw is given, multiply the
current draw by 115 to get the watt consumption.
2. Estimate the time (in hours) that each piece of equipment
will be running between battery charging cycles.
3. Calculate the total watt-hours of energy consumption
(power x operating time) using the average power
consumption and the total estimated running time
(in hours). Power x Operating Time = Watt-Hours.
4. Divide the watt-hours by 10 to determine how many
battery (12 volt) ampere-hours will be consumed.
Power Consumption
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Laptop
100 watts x 2 hours
= 200 watt-hours
Blender
300 watts x 15 minutes
= 75 watt-hours
Turning Your Inverter On or Off
•
Be sure to have your power inverter properly installed
before attempting to turn the unit on (see installation
page 6).
To turn the power inverter on:
1. If a DC power supply is being used as the power
source, switch it on.
2. On the Output End, press the Power Button to on.
The inverter is now ready to deliver AC power to your loads.
If several loads are to be operated by the inverter, turn
them on separately, after the inverter has been turned on.
This will ensure that the inverter does not have to deliver
the starting currents required for all the loads at once.
NOTE The Power Button turns the control circuit
in the inverter on and off. It does not disconnect
power from the inverter.
When the button is in the off position, the inverter
draws no current from the battery. When it’s in the
on position, but no power is being supplied to a
load, the inverter draws less than 600 milliamperes
from the battery. This is low current draw. It would
take more than a week to discharge a 100 ampere-
hour battery at this rate depending on the age of
the battery.
Power On and Off
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Power Button
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CPI1590_MANL.indd 12-13 12/5/14 2:14 PM
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