Xantrex Technology 10 owner manual 4Typical Power Consumption

Batteries

To calculate amp-hour consumption, first look at the rating plate on your AC appliances. Each appliance will be rated in either AC amps or AC watts or AC VA (volt-amps) apparent power. Use one of the following formulas to calculate the DC amp-hour draw for a 12-volt system:

(AC amps × 10) × 1.1 × hours of operation = DC amp hours * (AC watts ÷ 12) × 1.1 × hours of operation = DC amp hours * (AC VA ÷ 12) × 1.1 × hours of operation = DC amp hours * In all formulas, 1.1 is the factor for inverter efficiency.

*Divide amp hours by 2 for 24-volt systems.

**Batteries are frequently charged to 85% of full charge when charging with alternators without 3-stage regulators.

Calculate the above for every AC appliance you intend to use on your inverter. This will give you the total number of amp hours used between recharges. Size your battery bank using this number as a guideline. A good rule to follow is to size the battery bank about two times larger than your total amp hour load requirement. Plan on recharging when 50% discharged.

Table 3-4Typical Power Consumption

	Typical			Appliance Run Times/Amp Hours*
Appliance	Wattage	5 min	15 min	30 min	1 hr.	2 hr.	3 hr.	8 hr.	24 hr.
13" color TV	50	0.33	1	2	4	8	12	32	96
19" color TV	100	0.66	2	4	8	16	24	64	192
VCR	50	0.33	1	2	4	8	12	32	96
Lamp	100	0.66	2	4	8	16	24	64	192
Blender	300	2	6	12
Curling iron	50	0.33	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. foot refrigerator*	150			2	4	8	12	32	96
20 cu. foot 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
Vacuum	1100	7.3	22	44	88	176	264

The number in each box represents the amp hours used (at 12 volts DC) based on various continuous run times.

* Note: refrigeration is typically calculated using a 1/3 duty cycle.

975-0251-01-01 3–11