I have a 220v well pump is it ac or dc that i should set my tester on when it goes out


I'm not clear how you traced the wire, unless it's exposed the whole way?

If you do have access to the wire, even if it's just when it enters the panel, you should use a non-contact voltage detector to check for power. When you flip the breaker, it should go off.

There's a possibility that there are two feeds to the outlet. I would start by going through all breakers one-by-one (or several at a time, to narrow it down) to see if the power shuts off.

Keep in mind that you can get 220 by bridging two 120V breakers, and so one single breaker may not turn off all power. This setup is not legal, but it sounds like it may not be wired correctly anyway - don't make any assumptions when it comes to bad wiring!

Worst case, shut off all breakers, and confirm the power goes out. Then start turning things back on (an assistant and/or non-contact detector that beeps will help you here).

I personally would not touch any of those wires while my meter still read...

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What is your budget, and how much current do you need?

With 4 diodes in a bridge, you get a pulsating DC output around 311 volts. (= 220 * sqr root (2)). Diode bridge

With an inductor in series, and a large electrolyte capacitor in parallel, you have now improved your dc voltage (311 V). (observe the polarity otherwise you can blow up the capacitor!)

For safety you should insert a 1 M ohm resistor, in parallel with the capacitor, to bleed down the voltage when turning off power, because the capacitor stores a lot of deadly energy at 311 volts!

If you need exactly 220 Volts DC, the next step is to install a Buck boost voltage regulator, that takes down the voltage from 311 Volts to 220, with high efficiency! Buck–boost converter

I have found many instructive circuits here! Homo ludens electronicus

Study the matter and be careful! 220 volts is dangerous...

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The history of AC begins from Tesla. Tesla was a genius who harvested energy from the Niagra Falls using AC. When he suggested the idea of AC machines to his professor, he was embarrassed in front of the class stating that it was a perpetual motion scheme. He left to America to seek help from Edison who was had set up his business on the DC. Edison thoroughly went against AC.

The DC has an issue. Power = V times I. Now in DC, you have generated a voltage which means you have to have thick wires for higher currents throughout the transmission path. But if you generate higher voltage to reduce the current for the same power, then the appliances at your end will suffer. In short, there is no flexibility.

AC allows you to use transformers which do this conversion. You can have 220kV and 1 mA current during transmission and get 220V and 1A current for usage just by having a transformer at your end. The power remains the same. For transmitting 1A DC, you would require much...

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Re: Switching from AC Well Pump to DC

Looks like I'm going to purchase the Grundfos 6 SQF-3 pump, my neighbor said he would help me pull the AC well pump and put the Grundfos one in. I've never changed a well pump before so I have a few questions:

What you have to do to pull and replace the pump depends a lot on the existing pump. If it is hanging on galvanized pipe, it will be a lot harder than if it is hanging on rolled PVC. Also, the pipe is likely to be full of water and so will be heavier.

If your well is in an area that freezes, there is likely to be a pitless adapter.

-This Grundfos pump runs off of AC or DC so does it require two different sets of wiring, a three wire set for the AC side of this pump and also two thicker DC cables for the DC side?

The Grundfos SQF pumps take three wires, a ground and two others. According to the manual, it doesn't make a difference how you hook it up. To minimize voltage...

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This is a heavy duty design of a Pulse Width Modulator DC/AC inverter using the chip SG3524 .
I've been using it as a backup to power up all my house when outages occur since aprox. 6 years non stop.

If you like the work and intend to build the circuit don't forget to click on the "I made it" button so I know how many people benefit from the design, Thanks.


1> The schematic circuit design is for a 250 watt output, while the pics are of my 1500 watts inverter that i built, to increase the power of the circuit you have to add more of the Q7 and Q8 transistors in parallel, each pair you add will increase your power by 250 watts, ex: to get 750 watts of power from the inverter you need to add in parallel 2 of Q7 and 2 of Q8 to the original design.

2> If you increase the power transistors you have to enlarge the T2 transformer to match the new needs, the circuit's transformer is rated 25 amps to handle 250 watts of 220v, for every 1 additional amp...

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You are contradicting yourself in your explanation. So we can't really tell what the power source is. Regardless of whether it's 120 or 240 volt you would still hook it up the same way. White and Black source to Red and Black load at the heater. It doesn't matter which wire to which. If it is indeed only a 120 volt source you will only get a quarter of the production the water heater is rated for.

Ok let me make this a little more clear after your last entry. Hook black to black and white to red and ground to ground. If it is indeed a 120 volt source, the white is a neutral wire (current carrying ground) as I and the other poster said if you connect the 120 volt source to a 240 volt heater it is not going to harm anything and you will only get a quarter of the original capacity out of the water heater.

@Wired, you need a refresher on Ohm's law. With the resistive load of the element(s) they will draw half the current at half the voltage.


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"The way to get started is to quit...

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Originally Posted by


and thus we die from internal combustion. :)

yeah we die from heating ourselves up.

Actually there is more to it. Two atrias and two ventricles under them are electrically induced muscles in heart. At least as far as we know. In fact myocytes kind of muscle which makes these is electrical impulsed muscle.

Any electrical impulse makes both atrias and ventricles to contract together making heartbeats.

Imagine if existing electrical impulse is added something else in magnitude AC or DC. Heart will fibrillate!

Well under condition of fibrillation it is true heart will beat faster. Will it mean more blood/oxygen pumped???

No! Because the cycle fast isnt a requirement. The amplitude of fibrillation/oscillation or this new heartbeat occurring is very small in compare to full regular heartbeat.

In medical terms this is called "quiver". Heart is quivering. Is beating fast but amplitude of beating is very small and...

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