Tripp-Lite APS1012SW Manual Del Propietário página 7

3. Battery
3.1.1 Match Battery Amp-Hour Capacity to Your Application
Select a battery or system of batteries that will provide your Inverter/Charger with proper DC voltage and an adequate amp-
hour capacity to power your application. Even though Tripp Lite Inverter/Chargers are highly-efficient at DC-to-AC inversion,
their rated output capacities are limited by the total amp-hour capacity of connected batteries and the support of your
vehicle's alternator if the engine is kept running.
• STEP 1: Determine Total Wattage Required
Add the wattage ratings of all equipment you will connect to your
Inverter/Charger. Wattage ratings are usually listed in equipment
manuals or on nameplates. If your equipment is rated in amps,
multiply that number times AC utility voltage to determine watts.
(Example: a ¼ in. drill requires 2½ amps. 2½ amps × 120 volts =
300 watts .)
Note: Your Inverter/Charger will operate at higher efficiencies at about 75% - 80% of
nameplate rating.
• STEP 2: Determine DC Battery Amps Required
Divide the total wattage required (from step 1, above) by the battery
voltage (12) to determine the DC amps required.
• STEP 3: Estimate Battery Amp-Hours Required
(for operation unsupported by the alternator)
Multiply the DC amps required (from step 2, above) by the number
of hours you estimate you will operate your equipment exclusively
from battery power before you have to recharge your batteries with
utility- or generator-supplied AC power. Compensate for inefficiency by
multiplying this number by 1.2. This will give you a rough estimate of
how many amp-hours of battery power (from one or several batteries)
you should connect to your Inverter/Charger.
NOTE! Battery amp-hour ratings are usually given for a 20-hour discharge rate.
Actual amp-hour capacities are less when batteries are discharged at faster rates.
For example, batteries discharged in 55 minutes provide only 50% of their listed amp-
hour ratings, while batteries discharged in 9 minutes provide as little as 30% of their
amp-hour ratings.
• STEP 4: Estimate Battery Recharge Required,
Given Your Application
You must allow your batteries to recharge long enough to replace the
charge lost during inverter operation or else you will eventually run
down your batteries. To estimate the minimum amount of time you
need to recharge your batteries given your application, divide your
required battery amp-hours (from step 3, above) by your Inverter/
Charger's rated charging amps (depending on the Switch 6, 7 and 8
ON/OFF settings).
NOTE! For Tripp Lite Inverter/Chargers providing 1000 watts or less of continuous AC
power, a full-size battery will normally allow sufficient power for many applications
before recharging is necessary. For mobile applications, if a single battery is
continuously fed by an alternator at high idle or faster, then recharging from utility or
generator power may not be necessary. For Tripp Lite Inverter/Chargers over 1000 watts
used in mobile applications, Tripp Lite recommends you use at least two batteries, if
possible fed by a heavy-duty alternator anytime the vehicle is running. Tripp Lite Inverter/
Chargers will provide adequate power for ordinary usage within limited times without
the assistance of utility or generator power. However, when operating extremely heavy
electrical loads at their peak in the absence of utility power, you may wish to "assist
your batteries" by running an auxiliary generator or vehicle engine, and doing so at
faster than normal idling.
¼" Drill
300W
Blender
300W
540 watts ÷ 12V =
45 DC Amps × 5 Hrs. Runtime
× 1.2 Inefficiency Rating =
270 Amp-Hours ÷ 55 Amps
Inverter/Charger Rating =
7
Example
Tools
Orbital Sander Cordless Tool Charger
+ 220W + 20W =
Appliances
Color TV Laptop Computer
+ 140W + 100W =
45 DC Amps
270 Amp-Hours
5 Hours Recharge
540W
540W