Vanner SP00172 Owner's Manual download pdf (Page 27)

INCOR POR ATED

General Information

ITC-Series Inverter Page 27 Owner‟s Manual 10/7/05

100 AH battery is specified to be able to deliver 5 amps for a period of 20 hours. If the discharge current were

increased to 25 amps, the capacity will be reduced to approximately 75 AH (25 amps x 3 hours = 75 AH).

Operating temperature: A battery becomes less efficient at lower temperatures. Most battery manufacturers

specify the battery AH capacity at 80° F. At a temperature of 32° F, the same battery will have only about 65%

of its rated capacity even though it may be fully charged. At a temperature of 0° F, a battery's capacity will be

reduced to about 40% of its rated capacity.

Battery age: As a battery is used, the active material on the battery plates will gradually deteriorate and become

useless. As the battery gets older, there will be less and less useful material left on the plates and the

operating time will become noticeably shorter. A battery will age faster (loose active material from its plates

faster) if it is deeply discharged regularly, if it is left in a discharged state for extended periods of time, or if it is

repeatedly overcharged.

Series and/or Parallel Connected Batteries: Up to this point we have spoken of the battery as if it were a single

battery. In some cases this may be true, but in general, the battery may be made up of several individual

batteries electrically connected together to form a "Bank" of batteries. Batteries can be connected in series,

parallel, or a combination of series and parallel as long as all of the batteries in the bank are of equal ratings,

are from the same manufacturer, and are the same age. Old and new batteries should never be mixed in the

same battery bank. Mixed batteries will result in accelerated battery failure due to the unequal discharge and

recharge rates.

A series connection is where two or more batteries are connected positive (+) to negative (-). The total voltage

of the battery bank is the sum of the voltage of each battery in the bank. For example, most large custom

coaches require a 24-volt battery to crank the large diesel engine. The 24 volts is usually provided by

connecting two 12 volt batteries in series, and sometimes by connecting four 6 volt batteries in series. The

ratings of the series connected battery bank remain the same as the individual battery's rating. If the battery

bank is made up of two 8D size batteries in series, each with a CCA of 1050 amps, 425 minutes RC, and amp-

hour capacity of 200 AH, then these individual battery ratings are also the ratings of the entire 24 volt battery

bank.

Parallel connected batteries are batteries which are connected positive to positive and negative to negative.

They form a battery bank that has the same voltage as each individual battery. The ratings of a parallel

connected battery bank, in general, are the sum of the individual batteries. For instance, if two 8D batteries are

connected in parallel, and each battery has the ratings given in the paragraph above, then the ratings for the

battery bank become 2100 CCA, 900 minutes RC, and approximately 400 amp-hours. Parallel connected

batteries should be of the same voltage and rating to achieve optimum battery life and performance.

Sizing the Inverter Battery

Sizing a battery system for an inverter application can be a very tedious task if all the different variables, such

as discharge rate, depth of discharge, and operating lifetime are included in the calculations. To simplify these

calculations and get a reasonably correct battery size, we will assume:

1) A 50% depth of discharge for the purpose of obtaining a reasonable life time for a reasonable battery

system cost

2) There is no charge current into the battery system

3) The batteries are in a fully charged state at the beginning of the discharge cycle

4) The DC current draw from the battery does not exceed 1/3 the C rate for any length of time.

Follow the steps listed below to find the AH capacity required for your application.

Step 1: Make a list of each appliance, its power requirement in watts, and the amount of time in hours it will

be operating between charging cycles. Note: If the appliance is rated in amperes (amps) instead of

watts, multiply the amps by the voltage (120 or 240) to get watts.

Step 2: Calculate the watt-hours required for each appliance by multiplying the power requirement by the

operating time of that appliance.

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Vanner SP00172 Owner's Manual Page 27

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