Battery Size

 

 

Battery Reserve

Battery reserve capacity is a measure of how long a battery can deliver a

Capacity

certain amount of current—usually 25 amps. For example, a battery with

 

a reserve capacity of 180 minutes can deliver 25 amps for 180 minutes

 

before it is completely discharged.

Amp-hour (Ah)

Amp-hour capacity is a measure of how many amps a battery can deliver

Capacity

for a specified length of time—usually 20 hours. For example, a typical

 

marine or RV battery rated for 100 Ah can deliver 5 amps for 20 hours

 

(5 A × 20 hours = 100 Ah).

 

This same battery can deliver a higher or lower current for less or more

 

time, limited approximately by the 100 Ah figure (for example, 50 A for 2

 

hours, or 200 A for 1/2 hour), but usually the capacity figure given is only

 

accurate at the specified rate (20 hours).

 

To calculate the battery capacity you require, read “Estimating Battery

 

Requirements” on page B–4 and “Battery Sizing Example” on page B–4,

 

and then complete the “Battery Sizing Worksheet” on page B–5.

975-0263-01-01

B–3

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Xantrex Technology XM 1800, XM 1000 manual Battery Size