DIY Doctor

230v to 12v for Small Inline Water Pump

Postby embecmom2 » Sun Dec 08, 2019 4:15 pm

Hi, I have a catering trailer that is connected to mains power. I want to run a small water pump for sink but most of the caravan pumps are 12v and run off the caravan battery (which I dont have).. I would prefer to wire the pump into the mains via a fused switch also connected to my water heater so they are both on at the same time.

The pump I have is inline, self priming on demand so it will self activate when the taps are turned on. However being 12 v it really only offers the option to connect it to a car batter.. (black/red wires) ... is there a small transformer/connverter that can be used inline to convert the mains power to 12v (i.e LED lighting tranformer for example)... ? tks
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Postby Mr White » Sun Dec 08, 2019 10:02 pm

Yes there is such a thing you are looking for.
As for which one that depends on how much current your pump draws (You don't say)
That said you can always get one which can supply more current than is required as the pump will only draw what it requires.
If you buy a 12v D.C. "wall wart" instead of using a spur, you could use a socket and plug the wall wart into that.
Do be sure the wall wart you choose says 12v DC output, not 12v output.
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Postby ericmark » Mon Dec 09, 2019 12:38 am

I used a CB power supply in my caravan however at that time there were no LED lamps needing a 12 volt DC supply, so yes today they would seem to be the easy way to get 12 volt DC.
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Postby embecmom2 » Mon Dec 09, 2019 10:29 am

embecmom2 wrote:Hi, I have a catering trailer that is connected to mains power. I want to run a small water pump for sink but most of the caravan pumps are 12v and run off the caravan battery (which I dont have).. I would prefer to wire the pump into the mains via a fused switch also connected to my water heater so they are both on at the same time.

The pump I have is inline, self priming on demand so it will self activate when the taps are turned on. However being 12 v it really only offers the option to connect it to a car batter.. (black/red wires) ... is there a small transformer/connverter that can be used inline to convert the mains power to 12v (i.e LED lighting tranformer for example)... ? tks


Thanks for info, the pump only draws 4.5amps, and the whole connection shouldnt be over 15 amps. .. Id prefer just to wire something in place as sockets are at a premium.
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Postby Mr White » Mon Dec 09, 2019 8:03 pm

4.5 Amps for a 12v pump is quite a lot, are you sure that is correct?

If it is, then you will have to buy a 12v power supply. There are quite a few available. But if you get one of the "chassis" type I would strongly suggest mounting it in a suitable plastic box.
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Postby embecmom2 » Tue Dec 10, 2019 11:22 am

Mr White wrote:4.5 Amps for a 12v pump is quite a lot, are you sure that is correct?

If it is, then you will have to buy a 12v power supply. There are quite a few available. But if you get one of the "chassis" type I would strongly suggest mounting it in a suitable plastic box.


its one of these just 20psi version...

https://www.amazon.co.uk/Shurflo-2095-2 ... B00NU5IRN4
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Postby embecmom2 » Tue Dec 10, 2019 11:30 am

This is the sort of thing I was thinking could be used...

https://www.tlc-direct.co.uk/Products/S ... l4QAvD_BwE
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Postby Mr White » Tue Dec 10, 2019 8:42 pm

Your second link does not work. But as I said previously, so long as it can supply MORE current (4.5A in your case) and it is 12v dc it will be fine.
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Postby ericmark » Tue Dec 10, 2019 9:17 pm

That looks like a modern day SU petrol pump, it will likely have a large back EMF not sure if it will damage a lighting power supply, personally I would test on a battery first, and would consider using a small battery and battery charger rather than a power supply.
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Postby embecmom2 » Wed Dec 11, 2019 9:03 am

Mr White wrote:Your second link does not work. But as I said previously, so long as it can supply MORE current (4.5A in your case) and it is 12v dc it will be fine.

tks for help yea this one runs to 60 watts.. nothing ventured I guess! If it doesnt work then I can default to the battery.
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