FourWinds Enterprises, Inc.

Determine your boat's power usage by completing the chart below.

Use the estimates below or calculate usage by multiplying the current used by each device times the expected hours of usage per day.

Equipment	Amp Draw	Hours used at anchor	Amp Hours at anchor	Hours used under sail	Amp Hours used under sail
Refrigeration	2.5 - 20	24 or 5	60 - 100	24 or 5	60 - 100
Auto Pilot	0.5 - 10	0	0	24	12 - 240
Ham Radio	1 - 20	1 - 5	1 - 100	1 - 2	1 - 40
Color TV	3 - 7	3 - 5	9 - 35	0	0
20w Fluorescent Light	1.5	4 - 6	6 - 9	2 - 12	3 - 13
Cabin Fan	1	4 - 10	4 - 10	0	0
Nav Light	2.5	0	0	7 - 9	17 - 23
Stereo	1	5 - 15	5 - 15	3 - 10	3 - 10
Radar	4	0	0	4 - 7	16 - 28
12v Water Maker	4	2 - 4	8 - 16	2 - 4	8 - 16
VHF Radio	0.5 - 10	12	6 - 10	24	12 - 15
GPS	0.5 - 1	0	0	24	12 - 24
Depth Sounder	0.5	2	1	2 - 6	1 - 3
Anchor	2	8	16	0	0
Anchor Windless	80	0.1	8	0	0
Fresh Water Pump	7	0.3	2	0.3	2
Bilge Pump	8	0.2	4	0.2	4
Computer	2 - 8	1 - 4	2 - 32	1	2
Spreader Lights	8	0.1	1	0.3	2
Propane Valve	1	1	1	1	1
Total Amp Hours per Day			124 - 360	156 - 523

Typical Power Consumption

If you have an amp meter in your power distribution panel, record the amps used by each piece of equipment. Multiply it by the number of hours used per day. Total the equipment Amp Hours to obtain the daily Amp Hours used. Add 20% to obtain the Amp Hours that must be put back in the batteries per day to keep even.

Calculate the usage both at anchor and underway, and call or email us with the results.


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Phone:	941.575.4404
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Fourwinds Enterprises, Inc
1205 Elizabeth Street
Punta Gorda, FL 33950
N 26° 55.6685
W 082° 02.6963