Contax SW 2524 - REV A Guia de Instalação descarregar pdf (Página 53)

Battery Information

975-0637-01-01 Rev B 1–35

This guide for use by qualified personnel only

Estimating Battery Requirements

Calculating Battery Size

Step 1:

Compute

Amp-hours

For each appliance, compute the number of amp-hours that will be used between

charging cycles, as follows:

1. Obtain the wattage. If the wattage is marked on the nameplate rating, use that.

Otherwise, multiply the marked voltage and amperage:

WATTS = VOLTS × AMPS.

2. Obtain the Watt-hours by multiplying that amount by the hours the appliance will be

used:

WATT-HOURS = WATTS × HOURS.

3. Obtain the amp-hours that the appliance requires by dividing that amount by 20

(the factor for the Conext SW, which is a 24-volt system):

BATTERY AMP-HOURS USED = AC WATT-HOURS/20

For example, a 100 W light bulb that is used for 4 hours will use 400 watt-hours (Wh)

and the inverter will consume approximately 20 Ah from a 24-volt battery.

4. Enter this information on the blank calculation worksheet (page 1–37).

Step 2:

Calculate

Battery

Size

5. Complete the rest of the worksheet; see Table 1-4, “Battery Sizing Example” on

page 1–36 for an example.

Size the batteries for approximately twice the estimated total amp-hour usage. Doubling

the expected amp-hour usage ensures that the batteries will not be overly discharged

and extends battery life.

Do not skip this doubling step. More capacity is better since you will have more reserve

capacity, be better able to handle large loads and surge loads, and your battery won’t

be discharged as deeply. Battery life is largely dependent on how deeply the battery is

discharged. The deeper the discharge, the shorter the battery life.

Troubleshooting If you find that the system shuts down when appliances with large

motors are started, the problem may be that this motor is too much for the battery. Even

though you calculated the amp-hour requirements appropriately, the startup of a large

motor makes high demands on the battery. You may find that adding more amp-hours

(in the form of extra batteries or replacement with a bigger battery) solves the problem.

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Contax SW 2524 - REV A Guia de Instalação Página 53