how to get 12v DC with 15 Ampere?

Question

how to get 12v DC with 15 Ampere

Answer 1

Use a car battery - depends on what you are trying to do.

Answer 2

Wondering if you got a bit muddled?
Are you wanting to convert (by a "device") current into voltage? Can't be done. Current and Voltage measure different things. As an analogy Voltage is like a pressure, and Current is like a flow. You can have a pressure difference and no flow, but you need some pressure difference for there to be a flow.

However if you've got a value for the current/voltage and you're wanting to know what "makes" it so, it's probably explained by Ohm's law. (the equation associated with it is V=IR)

You'd need the Potential Difference of 12V (DC) to be applied across a resistance of 12/15 Ohms to get a current of 15 Amp (Also DC)

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Alternatively if you're looking for a source capable of 15A@12V, you can't go far wrong with a car battery. They are built to withstand that kind of current flow for sometime.

If you need that current for longer than a car battery can do so, you'll need to get the electricity from the mains
(battery capacity is measured in Ah. In you case each Ah of capacity in a battery would only last 60/15 = 4 minutes.)

You'd need a fairly hefty Power supply unit/regulator to convert mains AC (wattage needed=12*15=180W) in to a decent DC.

Unless you're experienced with Power supply design I'd try to use one that off the shelf. (If the current/voltage requirement is temporary, say as part of an initial test/experiment/one-off than maybe A bench PSU, will do the job, and be useful in the future)

Try a Good electrical store, or maybe you could "bodge" a computer's PSU (check it first, not all all can supply 15A continuously on their 12v line)

Answer 3

A 12V gadget is oftentimes powered with 24V panels. you want better than 12V to price a 12V battery. the problem with a 12V gadget is overcharging the batteries, frequently a 12V lead acid battery could be charged at 13.4V to avert unfavorable the battery with an overcharge yet this prices the battery slowly. an basic 12V offgrid gadget and not using a cost controller is oftentimes designed such that with predicted utilization, it does no longer exceed an 80% cost and does no longer drop decrease than a 50% cost, that avoids the damage and tear to the batteries. even if batteries are severe priced, a cost controller such that the cost could swap to a upkeep factor could forestall funds. The batteries favor to be in a nicely ventilated, dry, cool region, ideally faraway from the domicile in a separate structure because they can blow up and also you should commonly take readings of them or perhaps rearrange them to assist stability the charging. The wires are chosen by modern means and there are guidelines as to what the optimal rankings are for the countless AWG thicknesses even if you should purely use 80% of the rated maximums.

Answer 4

Are you looking for a good 15A supply to run some battery powered equipment from the mains? Buy a good quality power supply from someone like MFJ or Astron. The supplies at the following link are reviewed by ham radio operators, so the ones with good ratings are high quality supplies.

I use a Diamond GVZ4000 myself.

Answer 5

A simple fix for your need is to go buy a battery charger that will supply about 12 volts, with a 15 amp rating. You could use a battery as suggested, with a charger to keep it charged. The charger keeps the battery up to 12 volts and also regulates the charger output to 12 volts +/ 1 or 2 volts.

Answer 6

250VA step down Transformer 220V primary & 12 V secondary & connect bridge rectifier with circuit to get 12V DC supply