john in la
Well-known Member
Can you charge 2 deep cycle 12 volt batteries hooked in series with a single 12 volt charger without disconnecting the batteries???
How would you hook up the charger????
How would you hook up the charger????
- Thread starter john in la
- Start date
olgentdc
Well-known Member
i would think yes
Tramway Guy
Well-known Member
You cant. Either do them individually or reconnect them parallel.
timcasbolt
Well-known Member
hat's kinda the same thing as when you hook a charger up to a dual battery pickup truck. The batteries are already wired together in series and you just hook the charger to one of them.
john in la
Well-known Member
reconnect them parallel
Not an option.
I need 24 volts.
Not an option.
I need 24 volts.
timcasbolt
Well-known Member
orry. I misunderstood.
Tony in SD
Well-known Member
If the batteries are under no load, as in zero current draw, then yes you could. If the batteries are under load, maybe but I personally would not. You will have to charge each 12 volt battery separately with a 12 volt charger.
Steve@Advance
Well-known Member
You can charge them one at a time connected in series.
Connect the charger to one battery, polarity correct, just as any battery, then switch to the other battery.
They can remain connected while being charged.
Connect the charger to one battery, polarity correct, just as any battery, then switch to the other battery.
They can remain connected while being charged.
john in la
Well-known Member
There would be zero load while charging.
This is for a boat trolling motor.
I can get a double bank charger for about $150 but I already have a single bank charger.
I'm changing from a 12 volt motor to a 24 volt motor.
This is for a boat trolling motor.
I can get a double bank charger for about $150 but I already have a single bank charger.
I'm changing from a 12 volt motor to a 24 volt motor.
It would be more convenient and quicker to have a dual charger or two 12v chargers, but one charger will work doing 1 battery at a time with no need to disconnect anything. However you do it, 1 or 2 chargers, each set of leads will hook to a single battery +/+ & -/- (parallel)
You could also jump start the 24v truck using the same method above, but you might need a dual battery 12V truck and 2 sets of cables.
You could also jump start the 24v truck using the same method above, but you might need a dual battery 12V truck and 2 sets of cables.
Kinda want to do the same thing.I have two 12 volt batteries for my 24 volt trolling motor .one wire from the motor to positive on one battery the other wire from motor to negative on the second battery.than a separate wire connecting positive on one battery to negative on the other battery.I have been disconnecting them totally to recharge each one individually
With cables on batteries like they are in use,the only way is 1 battery at a time using a 12v charger. A 24v charger will charge both. You will get instructions on how to do both at the same time so here's how you can be 100% sure it will work and not smoke something. Before connecting charger put your volt meter probes on points where you intend hooking charger. If meter reads 12 volts,you can charge BUT now you must make sure of polarity. If meter reads -12v you have probes in reverse polarity,switch probes to read 12v.
With all that said I reccomend removing one cable and charging 1 battery at the time. Not neccessarly because thats best way,more so because it's safer when one isn't savy about electric.
With all that said I reccomend removing one cable and charging 1 battery at the time. Not neccessarly because thats best way,more so because it's safer when one isn't savy about electric.
MarkB_MI
Well-known Member
- Location
- Motown USA
I think you'll be much happier with a dual bank charger. They sell them for a reason. You'll find a good use for your single bank charger, or give it to a buddy.
You could use a DPDT switch to wire up your single bank charger to both batteries and switch back and forth between them. But if you forget to flip the switch, you'll find out once you're out on the water with one dead battery. There's nothing to remember with the dual bank charger, other than to plug it in when you get home.
You could use a DPDT switch to wire up your single bank charger to both batteries and switch back and forth between them. But if you forget to flip the switch, you'll find out once you're out on the water with one dead battery. There's nothing to remember with the dual bank charger, other than to plug it in when you get home.
Blackhole49
Well-known Member
- Location
- White Lake MI
If they truly are in series (24 volt) and not parallel, then no. If they are parallel, the yes, just hook to the +- of one battery. My on board charger on my 91 camper keeps my 2 6 volt batteries in series charged no problem and worked well when I had 2 12 volt in parallel on it. My 48 volt charger keeps all 8 6 volt batteries in series charged on my electric truck. That said, I have a 3 bank charger for the 3 12 volt batteries on my bass boat. If you doing 2 with one charger, it's best to replace them in pairs, or as in my truck, all 8 at once (sure glad they last 10+ years.
Good morning John,
YES (I bet you already know this) you can charge a single 12 volt battery using a 12 volt charger + to + and - to - from Charger to Battery even if happens to have another 12 volt battery in series with it. IE NO you don't need to disconnect to charge them one at a time !!!!!!!!!!!!! But sure you can if you wish and many would.
To charge BOTH at the same time in series as you know you need a 24 volt charger.
A disadvantage if charging one at a time is making sure both receive equal charge.
An advantage is you don't need to buy any dual charger (use the 12 volt charger you already have) even though sure it would come in handy.
There ya go John, best wishes now take care.. YOUR money YOUR choice
John T
YES (I bet you already know this) you can charge a single 12 volt battery using a 12 volt charger + to + and - to - from Charger to Battery even if happens to have another 12 volt battery in series with it. IE NO you don't need to disconnect to charge them one at a time !!!!!!!!!!!!! But sure you can if you wish and many would.
To charge BOTH at the same time in series as you know you need a 24 volt charger.
A disadvantage if charging one at a time is making sure both receive equal charge.
An advantage is you don't need to buy any dual charger (use the 12 volt charger you already have) even though sure it would come in handy.
There ya go John, best wishes now take care.. YOUR money YOUR choice
John T
Determined
Well-known Member
Simple solution that would be best for the batteries would be a 24 volt trickle charger, lots online for less than $50.
12V 10 amp / 24V 5 amp.
MarkB_MI
Well-known Member
- Location
- Motown USA
I don't think most folks here understand John's situation.
He had a 12 volt trolling motor on his boat (or 'bateau', as they call them down in LA), and a permanently installed 12 volt charger, something like this <a href=https://www.westmarine.com/buy/noco--1-bank-10-amp-onboard-battery-charger--20303988>NOCO single bank charger</a>. He probably had two 12 volt batteries wired in parallel.
Now he has upgraded his trolling motor to a more powerful 24 volt model, but he doesn't want to spring for a second single bank charger or a <a href=https://www.westmarine.com/buy/noco--2-bank-20-amp-onboard-battery-charger--20303996>dual bank charger</a>. He wants to charge both his 12 volt batteries, which are now wired in series, with his single bank charger. Ideally without disconnecting and reconnecting a bunch of stuff every time he charges the batteries.
He had a 12 volt trolling motor on his boat (or 'bateau', as they call them down in LA), and a permanently installed 12 volt charger, something like this <a href=https://www.westmarine.com/buy/noco--1-bank-10-amp-onboard-battery-charger--20303988>NOCO single bank charger</a>. He probably had two 12 volt batteries wired in parallel.
Now he has upgraded his trolling motor to a more powerful 24 volt model, but he doesn't want to spring for a second single bank charger or a <a href=https://www.westmarine.com/buy/noco--2-bank-20-amp-onboard-battery-charger--20303996>dual bank charger</a>. He wants to charge both his 12 volt batteries, which are now wired in series, with his single bank charger. Ideally without disconnecting and reconnecting a bunch of stuff every time he charges the batteries.
john in la
Well-known Member
Pretty close.
I have a 12 volt salt water trolling motor; a single 12 volt battery; and a single bank 5 amp NOCO mounted charger.
My trolling motor let out the smoke and needs to be rebuilt or replaced.
A friend just upgraded his 24 volt hand steer trolling motor to a GPS guided I pilot.
He said I could have his old motor as long as I used it.
If I decided I did not like it to bring it back.
In other words I can not sell it.
Since I only have one deep cycle battery; and I have been told to replace series mounted batteries in pairs; I now need to spring for two batteries.
In an effort to cut cost I am hoping I can use my existing charger for a while.
I am willing to put alligator clips on the charger wires so I can move it from battery to battery.
I am not willing to wear out the battery connections by taking them loose for every charge.
I will eventually spring for a dual bank charger but for the time being I was looking for ideas that will charge the batteries.
Not sure if I understand Determined post.
I did not think a 24 volt charger would charge two 12 volt batteries evenly.
I have a 12 volt salt water trolling motor; a single 12 volt battery; and a single bank 5 amp NOCO mounted charger.
My trolling motor let out the smoke and needs to be rebuilt or replaced.
A friend just upgraded his 24 volt hand steer trolling motor to a GPS guided I pilot.
He said I could have his old motor as long as I used it.
If I decided I did not like it to bring it back.
In other words I can not sell it.
Since I only have one deep cycle battery; and I have been told to replace series mounted batteries in pairs; I now need to spring for two batteries.
In an effort to cut cost I am hoping I can use my existing charger for a while.
I am willing to put alligator clips on the charger wires so I can move it from battery to battery.
I am not willing to wear out the battery connections by taking them loose for every charge.
I will eventually spring for a dual bank charger but for the time being I was looking for ideas that will charge the batteries.
Not sure if I understand Determined post.
I did not think a 24 volt charger would charge two 12 volt batteries evenly.
Determined
Well-known Member
Assuming you are only drawing 24 volt off the 2 batteries hooked in series and not pulling 12 volt off of one of them for other purposes then yes they will charge back up evenly.
A 12 volt battery is nothing more than 6 cells hooked up in series and they all charge evenly with a common 12 volt charger.
Your two 12 volt batteries hooked up in series is simply 12 cells hooked in series that require a 24 volt charger to evenly maintain them.
MarkB_MI
Well-known Member
- Location
- Motown USA
> Not sure if I understand Determined post.
> I did not think a 24 volt charger would charge two 12 volt batteries evenly.
Well, since you're buying two new identical batteries, it should be fine to charge them in series. It would be best to charge them separately from time to time to keep them in balance, but since you're discharging them in series it should be OK to charge them in series.
It would be possible to use a DPDT switch to switch the batteries from series to parallel when you're charging. The problem with that approach is the switch must be able to handle the maximum current draw of the trolling motor. And DPDT switches that can handle 30 amps or more aren't cheap. I can draw up a sketch if you're curious, though.
> I did not think a 24 volt charger would charge two 12 volt batteries evenly.
Well, since you're buying two new identical batteries, it should be fine to charge them in series. It would be best to charge them separately from time to time to keep them in balance, but since you're discharging them in series it should be OK to charge them in series.
It would be possible to use a DPDT switch to switch the batteries from series to parallel when you're charging. The problem with that approach is the switch must be able to handle the maximum current draw of the trolling motor. And DPDT switches that can handle 30 amps or more aren't cheap. I can draw up a sketch if you're curious, though.
caterpillar guy
Well-known Member
If you can put your wires on + to + and neg to neg when charging you can charge both at once . you will just have to reconnect to series + to motor neg of other battery to ground and the rest to each other for running the motor. This will be a bit of a hassle but doable till you get past the battery cost.
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