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Series Select Switch
In this Instructable, I will explain how to use a simple double pole, double throw (DPDT) switch to select series or parallel wiring for two loads on one power source. Wiring two loads in series will provide the full current available to both loads but only half of the available voltage, whereas, wiring the two loads in parallel will provide each load with the full available voltage, but only half of the available current. Using this switch can effectively allow you to choose two power settings for your two sources. In the case of light bulbs, this can give you a bright or dim setting, without needing two different wattage bulbs. This uses the simplest Double Pole Double Throw switch. This requires nothing more than the switch and some creative wiring. Please note that the "off" position only works if you have a "center off" switch! A DPDT relay can easily be substituted if you have one. If you want a 'struct' on this, leave me comments. Please note that this instructable is intended to go with another of my instructables. if you purchase one, you have more options as there are many out there. Both are most often DPDT switches. Don't forget to steal the motors or sometimes linear actuators out of the seat adjusters, if you can!!!!Broken stereos commonly have one or two switches in themIf you salvage a switch, the first thing I would do is test ACROSS the switch to be sure it is double pole. The switch has two rows of contacts with three cartier love lock pins per row. NO pin in one row should have continuity to ANY pin in the OTHER row. Imagine that the pins are numbered as below:1 42 53 6Begin by connecting pins 3 and 6 directly. The shortest piece of wire you can use will be best. These pins baby cartier bracelet will be your two power supply wires, as well as one wire from EACH of your motors. As this switch WILL NOT change polarities, make sure that your positive wire from one motor (we will call this one Motor "A") is connected to the positive power source wire, and pin 1. You now should have only 2 free wires, one from each motor. These wires will get crossed in this step. This is intentional. Connect the wire from Motor "A" to pin 5, (not 2, like you would expect). You CANNOT connect your power source to bracelets like cartier love fake pins 2 and 5 in this switch. The motors will be wired in series in one position, however the switch will cause a short in the other position.
Step 3: Enjoy, and Leave Me Comments
I hope you have enjoyed, and gotten something useful out of reading my first Instructable. Please leave comments if there was anything that was unclear or anything I should change as I will not know unless you tell me. Flames or non constructive criticism WILL BE DELETED (if I have that option.
I got on motor and 2x 18v batteries and 1 motor, in one setting I would like it to string the two together and make 36v and in the other I would like them to string together and make 18v. Is this possible?
Sorry 1 motor (writing this on a phone)love thw first page on identifying switches.
Is there any way to do this with transistors rather than a mechanical switch?
I like it!
I going to use this for my heated seat pads. Low/Off/High. Thanks!
would it be possible to do the exact opposite with 2 sources and 1 motor? Just swap each of the motors with a Battery and vise versa? I have 2 6s batteries to power a motor, and want to be able to run the two in series or Parallel.
like one of the cooment bellow, i too need to use 3 batteries but 4P2T seems too scary for me but i hope someone can help me out with an alternative for my requirement. using DPDT (on on on) switch, how do i wire up to achieve the following positions (P) for batteries connected in parallel: P1 > 1 battery, P2 > 2 batteries, P3 > 3 batteries. so far i only have the image below to refer to and i hope someone here can show me how. thank you
I have a project where I will have (80) 3,2VDC 90 AH Life YPO4 cells that I would like to set up to be in one of two configurations.
The first configuration would be 2 parallel strings of 40 cells each for 128 Volts and 180 Ah (23 kWh) of capacity.
The second configuration would be 5 parallel strings of 16 cells each for 51 Volts and (5x90=450) Ah (23 kWH) of capacity.
Maximum load will be 16 kW at 120 VDC (130 Amps) for config. 1
Maximum load will be 12 kW at 48VDC (250 Amps) for config. 2
I would love any thoughts you have on this scenario.
No I just hook the charger up when it time to charge.
Hey Mike,
Not sure if you still commenting on this really AWESOME instructable, but I am having a problem. I saw your instructable and I was really excited to trick out my son jeep hurricane power wheel. I added two 12v12Ah batteries and wanted the option of running the batteries in parallel and series so they could run it for awhile or tear it up at 24v. I bought a bandc marine dpdt switch and wired everything as you described (swapping batteries for motors in your diagram) and the 12v works but can get the 24v to work. The question I have is I regards to your diagram, everything works in the 1 4 or position, but in the 3 6 or position the switch doesn work. The switch has a 7th pin, so maybe that has something to do with it. Please help!
Agreed! I am wanting to do the same thing with my sons jeep hurricane. I have one other question though. Would it be possible to do this setup and be able to charge the batteries in parallel with a 12v battery tender hooked up? Kubert007, how do you charge your power wheels battery? Thanks in advance
Hi Anthony,
That exactly what I do. I switch it to parallel and hook my shumacher charger up. Keep in mind that it will take twice as long but when charging in parallel. However the shumacher is way better than the PW charger and will shut off when full.
Cool, do you hook up the charger with the clamps onto the terminals or do you have it hardwired? I would like to have it hardwired if possible
In this Instructable, I will explain how to use a simple double pole, double throw (DPDT) switch to select series or parallel wiring for two loads on one power source. Wiring two loads in series will provide the full current available to both loads but only half of the available voltage, whereas, wiring the two loads in parallel will provide each load with the full available voltage, but only half of the available current. Using this switch can effectively allow you to choose two power settings for your two sources. In the case of light bulbs, this can give you a bright or dim setting, without needing two different wattage bulbs. This uses the simplest Double Pole Double Throw switch. This requires nothing more than the switch and some creative wiring. Please note that the "off" position only works if you have a "center off" switch! A DPDT relay can easily be substituted if you have one. If you want a 'struct' on this, leave me comments. Please note that this instructable is intended to go with another of my instructables. if you purchase one, you have more options as there are many out there. Both are most often DPDT switches. Don't forget to steal the motors or sometimes linear actuators out of the seat adjusters, if you can!!!!Broken stereos commonly have one or two switches in themIf you salvage a switch, the first thing I would do is test ACROSS the switch to be sure it is double pole. The switch has two rows of contacts with three cartier love lock pins per row. NO pin in one row should have continuity to ANY pin in the OTHER row. Imagine that the pins are numbered as below:1 42 53 6Begin by connecting pins 3 and 6 directly. The shortest piece of wire you can use will be best. These pins baby cartier bracelet will be your two power supply wires, as well as one wire from EACH of your motors. As this switch WILL NOT change polarities, make sure that your positive wire from one motor (we will call this one Motor "A") is connected to the positive power source wire, and pin 1. You now should have only 2 free wires, one from each motor. These wires will get crossed in this step. This is intentional. Connect the wire from Motor "A" to pin 5, (not 2, like you would expect). You CANNOT connect your power source to bracelets like cartier love fake pins 2 and 5 in this switch. The motors will be wired in series in one position, however the switch will cause a short in the other position.
Step 3: Enjoy, and Leave Me Comments
I hope you have enjoyed, and gotten something useful out of reading my first Instructable. Please leave comments if there was anything that was unclear or anything I should change as I will not know unless you tell me. Flames or non constructive criticism WILL BE DELETED (if I have that option.
I got on motor and 2x 18v batteries and 1 motor, in one setting I would like it to string the two together and make 36v and in the other I would like them to string together and make 18v. Is this possible?
Sorry 1 motor (writing this on a phone)love thw first page on identifying switches.
Is there any way to do this with transistors rather than a mechanical switch?
I like it!
I going to use this for my heated seat pads. Low/Off/High. Thanks!
would it be possible to do the exact opposite with 2 sources and 1 motor? Just swap each of the motors with a Battery and vise versa? I have 2 6s batteries to power a motor, and want to be able to run the two in series or Parallel.
like one of the cooment bellow, i too need to use 3 batteries but 4P2T seems too scary for me but i hope someone can help me out with an alternative for my requirement. using DPDT (on on on) switch, how do i wire up to achieve the following positions (P) for batteries connected in parallel: P1 > 1 battery, P2 > 2 batteries, P3 > 3 batteries. so far i only have the image below to refer to and i hope someone here can show me how. thank you
I have a project where I will have (80) 3,2VDC 90 AH Life YPO4 cells that I would like to set up to be in one of two configurations.
The first configuration would be 2 parallel strings of 40 cells each for 128 Volts and 180 Ah (23 kWh) of capacity.
The second configuration would be 5 parallel strings of 16 cells each for 51 Volts and (5x90=450) Ah (23 kWH) of capacity.
Maximum load will be 16 kW at 120 VDC (130 Amps) for config. 1
Maximum load will be 12 kW at 48VDC (250 Amps) for config. 2
I would love any thoughts you have on this scenario.
No I just hook the charger up when it time to charge.
Hey Mike,
Not sure if you still commenting on this really AWESOME instructable, but I am having a problem. I saw your instructable and I was really excited to trick out my son jeep hurricane power wheel. I added two 12v12Ah batteries and wanted the option of running the batteries in parallel and series so they could run it for awhile or tear it up at 24v. I bought a bandc marine dpdt switch and wired everything as you described (swapping batteries for motors in your diagram) and the 12v works but can get the 24v to work. The question I have is I regards to your diagram, everything works in the 1 4 or position, but in the 3 6 or position the switch doesn work. The switch has a 7th pin, so maybe that has something to do with it. Please help!
Agreed! I am wanting to do the same thing with my sons jeep hurricane. I have one other question though. Would it be possible to do this setup and be able to charge the batteries in parallel with a 12v battery tender hooked up? Kubert007, how do you charge your power wheels battery? Thanks in advance
Hi Anthony,
That exactly what I do. I switch it to parallel and hook my shumacher charger up. Keep in mind that it will take twice as long but when charging in parallel. However the shumacher is way better than the PW charger and will shut off when full.
Cool, do you hook up the charger with the clamps onto the terminals or do you have it hardwired? I would like to have it hardwired if possible
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