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Message Subject: What size battery?

Bigbucks1985

Posted 12/16/2018 4:49 PM (#926035)
Subject: What size battery?

Posts: 200

So I have a small boat and I want a small 12v battery to power my fish finder. I am going to purchase a Garmin 7cv. Would like to use one of the small 12v batteries, but I am unsure of how much power to finder will draw. It says 500w rms/4000 peak. How many amp/hour would I need to power the finder all day? 8ah? 15ah?

Chemi

Posted 12/16/2018 9:48 PM (#926053 - in reply to #926035)
Subject: RE: What size battery?

Looking up the power draw from the Garmin website, it says:

Current draw @ 12V: 0.55A
https://buy.garmin.com/en-US/US/p/592107#specs

So an 8 Ah battery would be severely depleted after about 15 hours operating just this. An 8-hour day would use up half the capacity. I think I'd get something bigger than that. Unless it's a deep cycle battery, it wouldn't be a good idea to discharge it deeply on a routine basis.

Bigbucks1985

Posted 12/16/2018 11:34 PM (#926059 - in reply to #926053)
Subject: RE: What size battery?

Posts: 200

I saw a 15ah deep cycle battery. So after a 8-10 hour day that would draw about 5 amps. How far can I safely discharge a deep cycle before really hurting the longevity of the battery?

Chemi

Posted 12/17/2018 1:45 PM (#926083 - in reply to #926059)
Subject: RE: What size battery?

With a deep cycle battery, I don't like to go beyond 20% left, and then only in a pinch. AGM batteries are better than conventional deep-cycle batteries in this respect.

14ledo81

Posted 12/17/2018 3:14 PM (#926092 - in reply to #926059)
Subject: RE: What size battery?

Posts: 4269

Location: Ashland WI

Bigbucks1985 - 12/16/2018 11:34 PM

I saw a 15ah deep cycle battery. So after a 8-10 hour day that would draw about 5 amps. How far can I safely discharge a deep cycle before really hurting the longevity of the battery?

I wouldn't worry to much about the longevity of the battery. Those small ones are not that expensive to replace if need be.

Bigbucks1985

Posted 12/17/2018 5:14 PM (#926104 - in reply to #926092)
Subject: RE: What size battery?

Posts: 200

Right. I will just pick up a 12-15 ah battery, deep cycle if possible and be done with it.

Bigbucks1985

Posted 12/17/2018 10:37 PM (#926117 - in reply to #926104)
Subject: RE: What size battery?

Posts: 200

Can I charge a 15ah battery with a 3 amp battery tender? Or should I use a smaller charger?

14ledo81

Posted 12/18/2018 6:22 AM (#926120 - in reply to #926117)
Subject: RE: What size battery?

Posts: 4269

Location: Ashland WI

Bigbucks1985 - 12/17/2018 10:37 PM

Can I charge a 15ah battery with a 3 amp battery tender? Or should I use a smaller charger?

I did that all last season and didn't have a problem. I use my helix 9 for ice fishing.

Chemi

Posted 12/18/2018 9:57 AM (#926145 - in reply to #926117)
Subject: RE: What size battery?

Bigbucks1985 - 12/17/2018 11:37 PM

Can I charge a 15ah battery with a 3 amp battery tender? Or should I use a smaller charger?

Yes, absolutely!

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