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Max Online: 36273 @ 01/23/13 02:34 PM
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#10399630 - 11/09/14 08:45 AM Charging Question
T Bird Offline
TFF Team Angler

Registered: 03/07/10
Posts: 3940
Loc: Temple, Texas USA
If I connect two start batteries in parallel will the outboard charge both simultaneously or is a switch needed.
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#10399977 - 11/09/14 01:34 PM Re: Charging Question [Re: T Bird]
heybaylor Offline
Extreme Angler

Registered: 01/24/05
Posts: 1722
Loc: Lake Fork
It will charge both batteries, if they are perfectly matched then the charging voltage will be 1/2 of normal charge to each battery.
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#10401529 - 11/10/14 11:07 AM Re: Charging Question [Re: T Bird]
OIF3 Offline
Outdoorsman

Registered: 10/02/08
Posts: 249
Loc: Fredericksburg TX
Would think no, think the charging system on the motor is designed for twelve volt not 24.
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#10401531 - 11/10/14 11:08 AM Re: Charging Question [Re: T Bird]
OIF3 Offline
Outdoorsman

Registered: 10/02/08
Posts: 249
Loc: Fredericksburg TX
Would think no, think the charging system on the motor is designed for twelve volt not 24.
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#10401595 - 11/10/14 11:33 AM Re: Charging Question [Re: T Bird]
TLW Offline
Extreme Angler

Registered: 11/16/06
Posts: 2004
Loc: ft worth
"parallel".... better off with perko battery switch.


Edited by TLW (11/14/14 01:26 PM)

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#10401698 - 11/10/14 12:06 PM Re: Charging Question [Re: T Bird]
Lou r Pitcher Online   content
Extreme Angler

Registered: 10/06/05
Posts: 1676
Originally Posted By: T Bird
If I connect two start batteries in parallel will the outboard charge both simultaneously or is a switch needed.


When you 1st connect two partially of fully discharged batteries in parallel, the less discharged battery will discharge into the more discharged battery....this will have at least some negative effect on battery life.

When you connect the motor or charger, both will receive the same applied voltage, but each will accept and receive differing amounts of charge current until they both reach full charge.

When the motor is running, it will charge both to its amperage ability which varies with RPM. If you were to use a single bank charger that uses charge lead temperature sensing to compensate and optimize it's charging voltages, this feature and safety benefit will be lost for the jumpered battery not connected to the charging lead.

Parallel charging works but is a compromise. Best to avoid repeated parallel charging especially if the batteries are not of the same age, size and condition or not always parallel discharged. A weak unusable battery will be harder to detect.

A separate house and cranking battery usually offers several advantages over a two paralleled cranking battery setup. Most better and larger boats throughut the world use a dedicated cranking battery + separate house electronics battery setup. In that case a combine switch is usually included to add the batteries together in a cranking emergency.

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#10403689 - 11/11/14 08:41 AM Re: Charging Question [Re: T Bird]
T Bird Offline
TFF Team Angler

Registered: 03/07/10
Posts: 3940
Loc: Temple, Texas USA
Thanks all, appreciate the info.
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#10404280 - 11/11/14 01:06 PM Re: Charging Question [Re: T Bird]
LarryBud Offline
Pro Angler

Registered: 09/04/13
Posts: 611
Loc: Springtown, Texas
A couple of things. Someone said you voltage will be cut in half. No, you current will be cut if half. Your batteries will charge but not as fast.

Another thing. Most charging units get ruined because people throw an undercharged battery in their boat and expect the system to bring it up. It will but when your battery is low, your charging system is going to supply more current than normal charging. This extra heat is generally what kills a charging system. Best practice is to keep your batteries charged up at home. Much better for your system.

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#10407440 - 11/12/14 06:02 PM Re: Charging Question [Re: LarryBud]
heybaylor Offline
Extreme Angler

Registered: 01/24/05
Posts: 1722
Loc: Lake Fork
Originally Posted By: LarryBud
A couple of things. Someone said you voltage will be cut in half. No, you current will be cut if half. Your batteries will charge but not as fast.

Another thing. Most charging units get ruined because people throw an undercharged battery in their boat and expect the system to bring it up. It will but when your battery is low, your charging system is going to supply more current than normal charging. This extra heat is generally what kills a charging system. Best practice is to keep your batteries charged up at home. Much better for your system.


Wow, I did make a mistake ...current is correct ...my bad ...back to my doghouse
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#10411173 - 11/14/14 12:08 PM Re: Charging Question [Re: heybaylor]
LarryBud Offline
Pro Angler

Registered: 09/04/13
Posts: 611
Loc: Springtown, Texas
Originally Posted By: heybaylor
Originally Posted By: LarryBud
A couple of things. Someone said you voltage will be cut in half. No, you current will be cut if half. Your batteries will charge but not as fast.

Another thing. Most charging units get ruined because people throw an undercharged battery in their boat and expect the system to bring it up. It will but when your battery is low, your charging system is going to supply more current than normal charging. This extra heat is generally what kills a charging system. Best practice is to keep your batteries charged up at home. Much better for your system.


Wow, I did make a mistake ...current is correct ...my bad ...back to my doghouse


No worries heybaylor... happens to the best of us.

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#11050662 - 08/19/15 08:18 AM Re: Charging Question [Re: T Bird]
aporcarello Offline
Green Horn

Registered: 06/13/12
Posts: 8
Loc: Houston, TX
I have a perko switch on my boat, OFF, 1, ALL and 2, I was wondering if I set the switch to ALL and put a charger on one of
the batteries, will both batteries charge?
Or do I just leave the switch in the off position and charge the batteries individually?
I'm just talking basically a trickle charger..
Thanks
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#11051861 - 08/19/15 04:34 PM Re: Charging Question [Re: OIF3]
Bob Landry Online   content
Extreme Angler

Registered: 08/10/11
Posts: 2042
Loc: Austin, Tx
Originally Posted By: OIF3
Would think no, think the charging system on the motor is designed for twelve volt not 24.


Two 12V batteries in parallel is still 12V, not 24V.
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