Xantrex Technology XM 1800, XM 1000 manual Battery Size

	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