Best Battery and Adapter for 12V 8A Blower & 1.5A Pump DIY Air Cooler on 230V Mains

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#1 21684592 12 Jun 2020 07:00

Nura Dansumaila Nura Dansumaila

Anonymous

Post #1
21684592 12 Jun 2020 07:00

Hi, i'm building a DIY air cooler using an automotive 12V, 8Amps blower, and a 12V, 1.5Amps submersible pump. I intend to use a DC motor controller to reduce blower air speed, ranging from 40%-100%, i'm aware that reduces the power going to the blower (btw, does a DC controller reduce voltage or amperage?). What kind of adapter should i use to make it compatible with a 230V mains? and what type of rechargeable battery should i use in case of outdoor usage that will last for some time? Thank you
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#2 21684593 13 Jun 2020 00:00

Elizabeth Simon Elizabeth Simon

Anonymous

Post #2
21684593 13 Jun 2020 00:00

Most modern DC motor controllers use PWM control so the peak voltage and current is the same.

For a 230V to 12V adapter, you need one that can provide at least 8A (for blower) plus 1.5A (for pump) plus some margin for your controller. A 10A adapter would be minimum. 15A might be better.
As for a battery, you can use lead-acid gel cell (deep cycle), Lithium-ion, or Lithium Iron Phosphate (LiFePO). Battery ratings are typically in Amp hours but not all the capacity is usable (depending on battery type). If you want to run at full speed for 4 hours you will need at least 4 x 9.5 = 38 Ah usable capacity.
#3 21684594 13 Jun 2020 00:29

Nura Dansumaila Nura Dansumaila

Anonymous

Post #3
21684594 13 Jun 2020 00:29

Thanks a lot Elizabeth. Do I connect the blower and pump directly to the battery, or to the adapter? I would want the battery to be charging simultaneously while the cooler is in operation.
#4 21684595 15 Jun 2020 04:09

John David Heinzmann John David Heinzmann

Anonymous

Post #4
21684595 15 Jun 2020 04:09

It is not clear to me what you want the battery for. You say outdoor usage but you want it charging while the cooler is running?It looks like you should use a 12V motor controller. It's input should connect to either the 12 V output of the adapter, or the 12 V terminals of the battery and the output to the blower motor. Likewise, the pump motor should connect to the same places as the controller input, that is, in parallel with the controller input. For charging while operating the cooler, then the adapter output, controller input and pump motor input should all be connected together in parallel (all 3 positive terminals tied together and all three negative terminals tied together). You should make sure that the adapter is the type that will not be damaged when it is connected to the battery but not the 230 V mains. Good luck. -JD
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#5 21684596 15 Jun 2020 21:39

Elizabeth Simon Elizabeth Simon

Anonymous

Post #5
21684596 15 Jun 2020 21:39

If you want the battery charging when connected to AC, one possibility is to use a battery charger instead of an adapter (or an adapter that can charge the battery). In this case, you will need a battery charger / adapter that can provide more than 10A so it will be able to charge the battery while running. I would be inclined to put a diode in between the battery and the adapter to prevent the battery from discharging when not plugged in to AC.Another possibility is to use a switch. On is connect to AC, off is battery only.
#6 21684597 16 Jun 2020 03:12

Nura Dansumaila Nura Dansumaila

Anonymous

Post #6
21684597 16 Jun 2020 03:12

Thank you Elizabeth, John. This is very helpful.
#7 21684598 16 Jun 2020 05:05

PeterTraneus Anderson PeterTraneus Anderson

Anonymous

Post #7
21684598 16 Jun 2020 05:05

A diode between battery and charger may be a bad idea. The charger does not know about the diode drop, so may misjudge the state-of-charge. Some lead-acid chargers measure the battery voltage between pulses of charging current by drawing small amounts of current from the battery.
#8 21684599 16 Jun 2020 05:32

Elizabeth Simon Elizabeth Simon

Anonymous

Post #8
21684599 16 Jun 2020 05:32

Good point Peter. One would hope that the charger would have diode or some such built in but I know better than to count on that from an inexpensive charger. A switch is a much better solution to prevent discharge of the battery when operating on AC.
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#9 21684600 16 Jun 2020 13:50

Venkat Chacko Venkat Chacko

Anonymous

Post #9
21684600 16 Jun 2020 13:50

This depends on the input voltage range of the motor. Normally a 3.7V motor might accept something like 2-5V, beyond which the motor will not operate efficiently, and the life span will be reduced. You need to find the specs for the motor to know if 9V will drastically reduce the motor’s life, or if 9V is within the tolerable range.
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#10 21684601 16 Jun 2020 16:29

Aaron Paker Aaron Paker

Anonymous

Post #10
21684601 16 Jun 2020 16:29

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#11 21684602 18 Jun 2020 17:50

kagem alyy kagem alyy

Anonymous

Post #11
21684602 18 Jun 2020 17:50

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#12 21684603 18 Jun 2020 17:52

kagem alyy kagem alyy

Anonymous

Post #12
21684603 18 Jun 2020 17:52

Science is full of mysteries that need to be discovered in Engineering Projects and explored. Experimentation is the sole solution to curiosity. Thus, a science fair, which is a common school event, is launched almost every year to allow children to discover things on their own.
#13 21684604 26 Jun 2020 08:39

Frank Bushnell Frank Bushnell

Anonymous

Post #13
21684604 26 Jun 2020 08:39

Hi Nura,Please would you upload a diagram of your proposed circuit, then we can provide more precise guidance.
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Topic summary

A DIY air cooler project uses a 12V, 8A automotive blower and a 12V, 1.5A submersible pump controlled by a DC motor controller with PWM to adjust blower speed between 40% and 100%. The motor controller modulates current via pulse-width modulation without reducing peak voltage or current. For a 230V AC to 12V DC power supply, an adapter rated for at least 10A (preferably 15A) is recommended to cover combined load and controller margin. For outdoor use with battery backup, suitable rechargeable batteries include lead-acid gel cell (deep cycle), Lithium-ion, or Lithium Iron Phosphate (LiFePO4), with capacity calculated based on desired runtime (e.g., 38Ah for 4 hours at full load). The blower and pump should connect in parallel to the motor controller input, which in turn connects to either the adapter output or battery terminals. To enable simultaneous battery charging and operation, a battery charger capable of supplying over 10A is advised, with a switching mechanism preferred over diodes to prevent battery discharge when on AC power. The charger and controller wiring should ensure compatibility and avoid damage when the battery is connected without mains power. Detailed circuit diagrams are recommended for precise guidance.
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Best Battery and Adapter for 12V 8A Blower & 1.5A Pump DIY Air Cooler on 230V Mains

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