Battery Bank Diagram - Wagan Tech ProLine 2007-2 Manual De Usuario

Inversor de energía 3000w

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ProLine

3000W Power Inverter by Wagan Tech

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• Charge level of the batteries (between use, chargers have to be able to fully

charge the batteries)

• Temperature of the batteries (colder batteries provide fewer amps)

• Age and condition of the batteries (older batteries lose AH capacity)

• Compliance with turning off unnecessary AC loads.

• Use of DC appliances and compliance with turning off unnecessary

DC loads.

DERATING THE BATTERY BANK

Most lead-acid batteries have a rating expressed in amp-hours (AH). The most common

rating of AH is "at the 20 hour rate".

NOTE: Despite several Internet explanations, here is no relationship between Cold Cranking

Amps (CCA) and Ampere Hours (AH).

For example; if a 20AH battery is discharged at a 1 amp rate, is will take 20 hours to

discharge that battery. The terms "charged" and "discharged" relate to actual battery

voltage. This means that the output voltage of a nominal 12 volt battery starts at 13.2 volts

(fully charged) then drops to 10.6 volts (discharged). If the load on the battery causes

the battery to discharge faster than the 20 hour rate, the capacity (AH) of the battery is

measurably reduced (derated). Derating is a major run time factor. The curve in the following

chart can help to determine what the battery bank can deliver under load. The results are

used to estimate how much additional battery capacity is needed to achieve the desired run

time.

The left vertical numbers of the curve represents percentage of the battery capacity at the

20 hour rate. In this example, the user needs a one hour run time. If the example battery is

220AH (20 hour rate), and the load is 220 amps that is 100 percent (horizontal number)

of the AH (20 hour rate). Starting at the 100 percent horizontal point and looking up to

the curve the results are that only 56 the percent of the battery capacity is available. This

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means that a higher battery capacity is required to get the desired run time, one hour. The

curve also shows that a load of 200 percent of the 20 hour rate yields only 31 percent of

the battery capacity. The installer must carefully plan the capacity of battery bank or the run

time may be seriously affected. To the inexperienced installer, several trial battery capacities

may be required to make sure the large enough battery capacity is available to achieve the

desired run time.

The curve can be applied to any lead acid battery under load providing that it has an AH

rating at the 20 hour rate.

Continuing with the example above: The 150 amp load will need to run for 10 hours, so we

begin configuration with a 1500 AH battery. If the vertical is 1500 and the horizontal is 150

amps, the percentage of load on the battery is 10 percent. The curve shows that the 1500

AH is derated to 90 % of maximum. This means that the battery will have to be 1650 AH for

the full 10 hour run time. It is important to add some extra battery capacity, because as the

batteries age, they will lose AH capacity.

CONFIGURATING THE BATTERY BANK

Six volt, 220 AH "golf cart" batteries were selected for these illustrations because they are

generally readily available and relatively inexpensive. They are deep-cycle type and with

regular recharging they have a relatively long life. These batteries are "flooded" type; they

freely vent hydrogen and oxygen while under charging and heavy discharge. They must be

vented to outside air to prevent accumulation of explosive gases.