Does a battery tender draw much power
Club Member
Joined: Feb 2007
Posts: 16,320
Likes: 306
From: Boynton Beach, FloriDuh
Using a Battery Tender Jr. as a reference:
The Jr. has an input side rating of 12 watts. That's the "max" current draw when the Jr. is actually "charging" the battery (red light on). Once the battery is charged and the Jr. goes into "maintain" mode, the power draw drops to a fraction of the 12 watts.
Assuming the Jr. stays in the "charge" mode at full power for 30 days, the cost of operation for a month would be:
12w = .012kw x24hrs x 30days= 8.64kwh x Rate = Cost.
Assuming your electrical rate is 12˘ per kilowatt hour:
12w = .012kw x24hrs x 30days= 8.64kwh x .12 = $1.04/mo.
In reality, considering the Tender will spend most of the time in "maintain" mode and not really charging, it's probably safe to guess the typical monthly electrical cost is somewhere around 25-30˘.
The Jr. has an input side rating of 12 watts. That's the "max" current draw when the Jr. is actually "charging" the battery (red light on). Once the battery is charged and the Jr. goes into "maintain" mode, the power draw drops to a fraction of the 12 watts.
Assuming the Jr. stays in the "charge" mode at full power for 30 days, the cost of operation for a month would be:
12w = .012kw x24hrs x 30days= 8.64kwh x Rate = Cost.
Assuming your electrical rate is 12˘ per kilowatt hour:
12w = .012kw x24hrs x 30days= 8.64kwh x .12 = $1.04/mo.
In reality, considering the Tender will spend most of the time in "maintain" mode and not really charging, it's probably safe to guess the typical monthly electrical cost is somewhere around 25-30˘.
Club Member
Joined: Feb 2007
Posts: 16,320
Likes: 306
From: Boynton Beach, FloriDuh
Road Warrior
Joined: Sep 2011
Posts: 1,817
Likes: 116
From: Raleigh, NC
Been running more than 10 battery tenders now for the last 15 yrs or more 24/7 honestly have never noticed any difference in light bill. Doesn't matter either way it on average doubled the lives of all battery. One deep cycle battery we have is now near 15 yrs old and still going strong.
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Cruiser
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From: Maui
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