Battery Selection, Select Battery Type

Battery Selection

Select Battery Type

Select “Deep Cycle” batteries to enjoy optimum performance from your Inverter/Charger. Batteries of either Wet-Cell (vented) or Gel-Cell /Absorbed Glass Mat (sealed) construction are ideal. 6-volt “golf cart,” Marine Deep-Cycle or 8D Deep-Cycle batteries are also acceptable. You must set the Inverter/Charger’s Battery Type DIP Switch (see Configuration section for more information) to match the type of batteries you connect or your batteries may be degraded or damaged over an extended period of time.

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 plus the output of an alternator when one is used.

Example

• 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 estimate watts. (Example: a drill requires 2.8 amps. 2.8 amps × 230 volts = 640 watts.)

NOTE: Your Inverter/Charger will operate at higher efficiencies at about 75% - 80% of nameplate rating.

			Tools
13mm (1/2”) Drill		Circular Saw
640W	+	800W	=	1440W

Appliances and Electronics

Refrigerator	Table Fan	Signal Relay Tower	Desktop Computer with
Refrigerator	Table Fan	Signal Relay Tower		Large LCD Monitor
				Large LCD Monitor

• STEP 2) Determine DC Battery Amps Required

Divide the total wattage required (from step 1, above) by the nominal battery voltage to determine the DC amps required.

• STEP 3) Estimate Battery Amp-Hours Required

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.

540W + 150W + 500W + 250W = 1440W

1440 watts ÷ 48V = 30 DC Amps

30 DC Amps × 5 Hrs. Runtime

× 1.2 Inefficiency Rating = 180 Amp-Hours

•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 (23A or 90A, depending on Switch #5 setting).

180 Amp-Hours ÷ 23 Amps

Inverter/Charger Rating = 7.8 Hours Recharge