Sima Smooth Start Series Manual do Utilizador descarregar pdf (Página 18)

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Actual Current Draw

Approximate 12 volt current draw is the load in watts divided

by 10. Thus a 60 watt light bulb plugged into the inverter will

draw 6 amps (60 / 10 = 6) from the 12 volt supply.

Batteries are rated in several different ways:

Peak cranking amps - Not a useful number for inverter use.

Battery reserve capacity - How long a battery can supply a

given current, typically 25 amps, before the battery reaches a

low voltage. A battery rated at 200 minutes reserve can

deliver 25 amps for 200 minutes before it is discharged.

Ampere-hour capacity - How many amps a battery can deliver

over a period of time, typically 20 hours. A 100 amp-hour

battery can deliver 5 amps for 20 hours (5 x 20 = 100).

Actual operating time will depend upon the current draw

from the battery. A battery will deliver less total power

(energy) as you draw higher amps. A 100 amp-hour battery

can deliver 5 amps for 20 hours (100 amp-hours) but it will

only deliver 50 amps for 1 ½ hours (50 x 1.5 = 75) or 75

amp-hours at the higher rate.

Also remember, battery life is decreased if the battery is

discharged fully. Lead acid batteries have the longest life,

if they are kept fully charged.

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Sima Smooth Start Series Manual do Utilizador Página 18