Question on building DIY power supply.

[tec0]

That was my reaction too. Then he reminded me it is at 17v and not 220v.

The 60A is necessary if he want to get tree more chargers. So he is planning ahead. 60A can actually drive 5 chargers, but he is leaving headroom.

The problem with PC psu is that you get a voltage drop. It is also just 12v and the charger must then do adjustments, making the charger work harder and take longer to charge. When he connected the two units, he took the 12v and the 5v supplies, ending up with 17v but it drops to like 9v while charging.

He joked about looking at my inverted welder. Is that an option?

I really cannot say I never played with more than 15 amps myself on a 24Volt PSU similar to the one I posted above. With the right circuit "yes" it may well be "possible" but honestly just rather not do it… The wiring alone is going to be medieval to handle that type of amps. Not to mention that you have every possibility to blow yourself up. Rather do a search on what you can buy. But honestly you are looking for industrial type stuff and they are not cheap.

Also note that most homes are fitted with a 63 amp main breaker so it will probably overload it anyway… not to mention that the wiring in your home will run red hot.

Even a DC welder isn’t designed to run for hours on end so even if you could get control over the volts you will probably overload the protection circuits not to mention your main beaker and your home’s wiring. It is simply not designed to handle that type of amps “for a very long time”

[IMHO]

Also note that most homes are fitted with a 63 amp main breaker so it will probably overload it anyway… not to mention that the wiring in your home will run red hot. [/COLOR]

You seem to forget:

A typical house, that has a 60 amp breaker, can supply 60A @ 220v. That gives about 13200 Watts.
The power supply I am looking for should give 17v @ 60A = 1020 watt.
If we convert that to 220v load, it would only be pulling 4.6A (@220v)

Your house circuit therefore only needs to supply 4.6 amps.

[AndyD]

You seem to forget:.....The power supply I am looking for should give 17v @ 60A = 1020 watt.
If we convert that to 220v load, it would only be pulling 4.6A (@220v)

1020 watts from a 12volt source = 85 Amps assuming 100% efficiency. In the real world you can add at least 30% for losses including inefficiencies, cooling fans etc.

I think you need to approach this project again from the ground up and explore other possibilities.