I have a 12-volt sprayer that I use around my property, and it's currently connected to my tractor, but unfortunately, my tractor stopped running.

I hated having a wire ran from the battery to my pump sprayer and was thinking I could use a Dewalt battery conversion which is often used on power wheels.

Can this be done? I think all that would happen is the pump sprayer would become awesome with having more power.

I run my kiddos power wheel (6v motor) on a craftsman battery (19.2v Lith).

I use:
an inline fuse
https://www.amazon.com/gp/product/B000COA2ZW/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1

and a

Motor speed controller
https://www.amazon.com/dp/B081XQLN46/ref=cm_sw_r_cp_apa_glt_fabc_PJA0Y7FG92VEGQQ3YAM4?_encoding=UTF8&psc=1

I just used little spade terminal connectors and slide them on when we are using the car. You can dial it up or down depending on needed speed of motor. My only concern would be what amp hour your sprayer would likely need. Your drill battery is going to drain pretty quick I would guess. I am by no means an electrical engineer but I see no reason it wouldn't work?

It'll work, higher voltage will mean less current at the same power output.

Unrelated, but I put a 36V mobility scooter battery on my kids power wheels and screwed bike tread to the back wheels so it runs about 40 now.

Wodanaz said:

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Unrelated, but I put a 36V mobility scooter battery on my kids power wheels and screwed bike tread to the back wheels so it runs about 40 now.

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did the bike tire hack as well. Crazy how much better it drives/grips. But I keep it dialed way down in voltage because my kid cried at the 19.2v at full power.... She was 2 lol

chaca515 said:

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Can this be done? I think all that would happen is the pump sprayer would become awesome with having more power.

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Yes, but I'd follow DTK's advice and get a motor speed controller. If both links he gave take you to the same place, just search for DC motor speed controller on Amazon. For around $20 you're set, if appears.

Here's the caveat. Increasing the voltage on a DC motor (your pump) will cause it to run at higher RPM's. Since you're going to almost double the voltage, that extra speed (assuming you don't control it) will change the amount of fluid the pump is putting out proportionally. With a fixed spray tip size, that will increase the amount of pressure in the pump. If that pressure gets excessive, you risk damaging some of the parts inside the pump, or perhaps shortening their life, since the pumps are usually rated for a maximum operating pressure.

Now, if you want to run it flat out at the higher voltage, higher output setting, I'd get a bigger tip to keep the pressure within acceptable limits.

One final thing, which I doubt is an issue here -- the insulation on motor windings usually has a maximum voltage before it starts breaking down. Going from 12 to 20 volts wouldn't seem like something that would cause any problems though.

MouthBQ98 said:

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It'll work, higher voltage will mean less current at the same power output.

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The pump is likely a brushed DC motor. Without a controller, it will draw more current and use more power, spinning the pump faster, as mentioned above. Pending the design of the motor, spinning it that much faster could significantly increase iron losses and contribute more heat on top of the increased copper losses.

PWM - based brushed DC motor controllers are cheap on Amazon and typically come with a pot you can use to set the speed you want.

Pump HP will increase with the cube of the speed. Therefore, if you over speed the pump the motor will get overloaded.

Good point. I'm a bit rusty on my electric power. I wouldn't think that short bursts of usage would cause harm but sustained long lasting operation at about 50% higher than design voltage might not be so great.

You are right. Fixed my link. Thanks for catching!

Speed controller I used:
https://www.amazon.com/dp/B081XQLN46/ref=cm_sw_r_cp_apa_glt_fabc_PJA0Y7FG92VEGQQ3YAM4?_encoding=UTF8&psc=1