Xantrex Technology 10, 15, 30, 20, 25 owner manual AMP-HOUR Consumption Formulas

													BATTERIES
To achieve 50% cycling you should									AMP-HOUR CONSUMPTION FORMULAS
calculate your amp-hour consumption
										(AC amps x 10) x 1.1 x hours of
between charging cycles and use a battery
bank with twice that capacity**. Each AC										operation = DC amp hours
appliance or tool has a rating plate on it and will										(watts/ DC voltage) x 1.1 x hours of
be rated in either AC amps or watts or AC VA
										operation = DC amp hours
(volt-amps) apparent power. To calculate amp-
										(AC VA/ DC voltage) x 1.1 x hours of
hour consumption, use one of the formulas to
the right to calculate the DC amp-hour draw for										operation = DC amp hours
a 12 volt system.										DC voltage is 12, 24 or 32 depending on
Calculate the amp hours for every AC													your system.
appliance or tool that will be operated on the
inverter. This will provide the total number of									In all formulas, 1.1 is the correction factor for
amp hours used between recharges. Size the													inverter efficiency.
battery bank using this number as a guideline.								Typical Power Consumptlon
A good rule to follow is to size the battery bank
a minimum of two times larger than the										The chart identifies typical power
total amp-hour load requirement. Plan on								consumption for common AC loads. Use it as
recharging when 50% discharged.								a guide when identifying your power
**Batteries are typically charged to 85% of full								requirements.
													Many electric motors have
charge when charging with alternators without 3-stage
regulators.													momentary starting requirements
													well above their operational rating.
	Typical Power Consumption
													Start up watts are listed where
Appliance	Typical			Appliance Run Times / Amp Hours									appropriate. Individual styles and
	Wattage											brands of appliances may vary.
		5 Min.	15 Min.	30 Min.	1 Hr.	2 Hr.	3 Hr.			8 Hr.	24 Hr.
													If using the same battery
13" Color TV	50	.33	1	2	4	8	12			32	96
													bank for the inverter and other
19" Color TV	100	.66	2	4	8	16	24			64	192
													DC loads, be sure to consider
VCR	50	.33	1	2	4	8	12			32	96
													the power consumption of the
Lamp	100	.66	2	4	8	16	24			64	192
													DC loads when sizing the
Blender	300	2	6	12
													battery bank.
Laptop Computer	50	.33	1	2	4	8
Curling Iron	50	.33	1	2
3/8 Power Drill	500	3.3	10	20
Icemaker*	200			2.6	5.2	10.4	15.6			41.6	83.2
Coffee Maker	1000	6.6	20	40	80	160
3 cu' Refrigerator*	150			2	4	8	12			32	96
20 cu' Refrigerator*	750			21	42	84	126			336	672
Compact Microwave	750	5	15	30	60	120	180
Full Size Microwave	1500	10	30	60	120	240	360						NOTE Certain laser printers, breadmakers,
Vacuum	1100	7.3	22	44	88	176	264						digital clocks and appliance/tool chargers

Number in each box represents the total Amp hours used (@ 12 volt DC) based on various continuous run times.

*Note refrigeration is typically calculated using a 1/3-duty cyle.

may not operate on modified sine wave.

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