Iwould like to connect two 12-volt batteries to make 24-volt,would like to power an amp at 15-volts, ( looking for the extra amps), how can I do this

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Hello j37p,

You will need a thing called a "DC to DC Converter". Here's a link to one place that makes them: http://www.powerstream.com/

One model they have is the PST-D24/12-800. It will accept 20-28V input and has an adjustable output from 12.5-15.5V.

I'm hoping that you are not planning on trying to charge 3 batteries with your vehicle alternator. You would not want 2 12V batteries in series anywhere near the vehicle electrical system. They would definitely burn stuff up. You'll also want to be thinking about how to keep the dc converter and your amp(s) cool. Believe me, they will be getting hot and require some serious airflow.

Hope this helps.

Posted on Apr 14, 2009

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Posted on Jan 02, 2017

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Connect the two extra 12 volt batteries in series to get 24 volts. Then connect this new 24 volt supply in parallel to existing 24 volt battery supply.

Jan 30, 2017 | The Health & Beauty

If you connect 2 12 volt batteries in series to get 24 volts and you don't get it, then one of the batteries has a bad cell or you have a poor connection between the two.

Apr 26, 2016 | Boating

if you want the same voltage but with increased capacity connect positive to positive and negative to negative on each successive battery ---connected in parallel

example 6 X 12 batteries each of 200 crank hours will be equal to 12 volts and 1200 crank hours ( good for mobile fridges , winches , battery hoists etc)

if you want to increase voltage in the bank then connect positive to negative for each successive battery ---connected in series

for example

with 6 X 12 batteries of 200 crank amps you will have 6 times the 12 volts which equals 72 volts and the current flow is increase from 200 crank amps to exceed the 1200 crank amps because of the electrical principles and formula I think it works out to be around 72 times the 200 crank amps ( I am sure that there are mathematicians out there that will adjust the sum to make it correct)

However I think that you get the idea

when charging batteries it is always positive to positive with the battery leads to the first battery in the bank and the difference is if in parallel the charger has to be big enough the charge at the accepted rate of the batteries ( 12 volts charge at 14.5 volts and around 20 amps an drop back as the batteries charge

when the batteries are in series it all changes and best talk with a good battery supplier as to how it is set up and if you need to change the charging circuit and equipment

example 6 X 12 batteries each of 200 crank hours will be equal to 12 volts and 1200 crank hours ( good for mobile fridges , winches , battery hoists etc)

if you want to increase voltage in the bank then connect positive to negative for each successive battery ---connected in series

for example

with 6 X 12 batteries of 200 crank amps you will have 6 times the 12 volts which equals 72 volts and the current flow is increase from 200 crank amps to exceed the 1200 crank amps because of the electrical principles and formula I think it works out to be around 72 times the 200 crank amps ( I am sure that there are mathematicians out there that will adjust the sum to make it correct)

However I think that you get the idea

when charging batteries it is always positive to positive with the battery leads to the first battery in the bank and the difference is if in parallel the charger has to be big enough the charge at the accepted rate of the batteries ( 12 volts charge at 14.5 volts and around 20 amps an drop back as the batteries charge

when the batteries are in series it all changes and best talk with a good battery supplier as to how it is set up and if you need to change the charging circuit and equipment

Jul 19, 2015 | Cars & Trucks

not exact, to charge apropiate needs 10% more than nominal voltage. if not, will not charge the batteries.

And the charger its very important because you can over charge the battery.An example,if you have a 12 Amps Batteries each one if you put it in series will be 24 Volts.at parallel conection will be 12 volts but the double of Amps.

At serial connection will be 12 Volts the amps will be the same but the volts will be 24.

The charger at 12 Volts must be 13.8-14.5 DC Volts and divide the Amps in Hours.

The charger at 24 Volts must be 26-28 Volts. to charge well.

The charger for 12 amps batt example must charge 2 amps per hour at 6 hours = 12 Amps.(2 Amps Charger by 6 Hours Charging= 12 Amps.(Fully Charged.

3 Amperes Charger needs 4 Hours to charge 12 amps Batt.

5 Amperes Charger needs 2 Hours charging an a quarter

All of this is at DC Current.

Luck.

And the charger its very important because you can over charge the battery.An example,if you have a 12 Amps Batteries each one if you put it in series will be 24 Volts.at parallel conection will be 12 volts but the double of Amps.

At serial connection will be 12 Volts the amps will be the same but the volts will be 24.

The charger at 12 Volts must be 13.8-14.5 DC Volts and divide the Amps in Hours.

The charger at 24 Volts must be 26-28 Volts. to charge well.

The charger for 12 amps batt example must charge 2 amps per hour at 6 hours = 12 Amps.(2 Amps Charger by 6 Hours Charging= 12 Amps.(Fully Charged.

3 Amperes Charger needs 4 Hours to charge 12 amps Batt.

5 Amperes Charger needs 2 Hours charging an a quarter

All of this is at DC Current.

Luck.

Oct 18, 2014 | UPG 12V 12Ah Electra Scoot-N-Go 88615...

The ASD relay supplies battery voltage (12+ volts) to the fuel injectors
and ignition coil(s). With certain emissions packages it also supplies
12-volts to the oxygen sensor heating elements. The Fuel Pump Relay is a
separate relay controlled by the ASD relay input to the PCM. Fuse #12
(10amp) provides 12 volts to the coil side of both the relays and the
ignition switch. Fuse #6 (30 amps) supplies 12 volts to the output side
of the relay. Fuse #16 (15 amp) from the relay output to the Oxygen
Sensors and Fuse #26 (15 amp) relay output to the PCM. Fuse #24 (20 amp)
is Fuel pump relay output to fuel pump. Fuse #19 (10 amp) supplies 12
volts direct to the PCM.

look for burned or melted wires in the offending circuit.

sounds like you wiggled a wire while installing new relay.

look for burned or melted wires in the offending circuit.

sounds like you wiggled a wire while installing new relay.

Mar 06, 2013 | Cars & Trucks

Check your batteries voltage you need at least 12 volts.If you don't have 12 volts then put the battery on a 2-4 amp charge for 6-8 hours.Then if the battery does'nt have 12 volts get a new battery.If your battery has 12 volts afterwards and still cuts off then your alternator is faulty.With the engine running your alternators power wire should show 13-15 volts coming out.

Feb 03, 2012 | 2004 GMC Sonoma

Hello! The required voltage is 24 volts...which means two 12 volt batteries connected in series...It sounds as if you have two 12 volt batteries connected in parallel...Which doubles the amps and leaves the voltage at 12 volts...Connect the negative of one battery to the positive of the second battery...Then from the positive of battery #1 to the negative of battery #2 is the required 24 volts for the Kole...Guru...saailer

Jan 17, 2012 | Kole audio 20 Farad Digital Car Capacitor...

No. you can put in extra batteries and use it, but you must remove you charging system from them to use it that way. Not really practical.

Mar 21, 2010 | Electrical Supplies

This thing is a beast! What criteria you ask? What do you want to jump? The answer.... any damn thing you want!

3200 peak amps is huge.

1600 peak amps is huge! You have got it covered here friend.

3200 peak amps is huge.

1600 peak amps is huge! You have got it covered here friend.

- 3200 peak 12 Volt amps.

- 1600 peak 24 Volt amps.

- Integrated voltage selection switch.

- LED battery status indicator.

- Automatic recharging.

- 60" Heavy-duty cables.

- DC outlet to power a variety of 12 Volt accessories.

Sep 26, 2009 | Solar ES1224 Truck PAC 3200 Peak Amp,...

A 12 volt battery is actually 13.2 volts fully charged. If you are reading 16 volts, you are probably getting extranious voltage from the system somewhere, especially if the vehicle is running when you check the voltage. The alternator will put out about 15-18 volts to charge the battery normally, and yours may put out 28-32 volts to charge them in series, but the batteries, when disconnected, should never read more than about 13.2 volts each. Typically, it will read about 12 1/2 volts when disconnected. COMPLETELY DISCONNECT BOTH OF THE BATTERIES. If you still read 16 volts when it is disconnected, you must have a bad meter because the battery can't produce that much voltage, no matter what. (Six 2.2 volt cells connected in series inside the case.) Put the meter on a known good battery on another car that is not running and see if you get the same reading. It sounds like the other battery is almost dead, regardless, and it sounds like your series/parallel switch may be malfunctioning. (That is the switch that puts the battery in series to run the 24 volt starter, then puts the batteries in parallel to run the remainder of the vehicle on 12 volts. This is all assuming that you have a diesel vehicle with a 24 volt starter and that is why you have two batteries.

Aug 19, 2008 | Toyota Land Cruiser Cars & Trucks

Oct 16, 2017 | Kicker Car Audio & Video

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