Wagan AC Inverter Manuel d'utilisateur télécharger pdf (Page 5)

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10,000 Watt AC Inverter by Wagan Tech

User’s Manual—Please read before using this equipment.

Using the 1500 watts (or 150 amps) for 10 hours example, 150 amps are needed for 10

hours. This provides us with the basic amp-hours (AH) of battery life that is required. Ten

hours at 150 amps equals 1500 Amp-hours (AH). This answer is just a starting point because

there are additional factors that determine actual run time. These include:

• Cable gauge and length (cable losses)

• 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)

• Use of DC appliances

• Compliance with turning off unnecessary AC and 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, there is no relationship between cold cranking

amps (CCA) and amp-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 12 volt battery starts at 13.2 volts (fully

charged) then drops to 10.0 volts (discharged). If a load on the battery causes the battery to

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

(derated). When batteries are under heavy load, derating is a major run time factor. The

following graph can help to determine what a battery bank can deliver under heavy load.

The results are used to estimate how much additional battery capacity is needed to deliver

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

means that a higher battery capacity is required to get the desired run time of 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 a large enough battery capacity is available to achieve the

desired run time.

The curve can be applied to any lead acid battery under heavy load providing that the

battery has an AH rating “at the 20 hour rate”.

The example 150 amp load needs 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 should be at least 16,500 AH for the full 10 hour run

time. It is important to add some extra battery capacity, because as batteries age, they lose

capacity.

CONFIGURATING THE BATTERY BANK

6 volt, 220 AH deep-cycle “golf cart” batteries were selected for these illustrations because

they are generally 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 charge and heavy discharge conditions. They

must be vented to outside air to prevent accumulation of explosive gases. If batteries are to

be kept in close proximity to the inverter or in a living space, use deep-cycle sealed lead

acid batteries (SLA).

www.wagan.com

Wagan and wagan.com are trademarks used by Wagan Corporation.

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