How to build a $20 47A power supply

[florianz]

that's the story:
I have three (2 weak, 1 strong) charger, and want to be on the safe side, even on the long run. soon I get a second strong charger with about 180watts to charge all six 5s (4000-5000mah) lipos quickly. I store my batteries low-medium charged, so when I decide on a saturday morning to go for some fun, they need to be charged in short time.

It can deliver a maximum of 75a, that doesn't mean that it has to do that all the time. with the allied p/s (500w) I have experienced that when all three chargers run on that one p/s, one charger gets problems. actually the p/s should be sufficient, but obviously it's not, even that it's a brand p/s. the other p/s (brand stuff) I have converted recently is about the same, it says 550w, but actually can handle solely the 150w charger.

overall, the p/s worked great for me. The only problem is, when it says 500w, it's all together, on all lines, but not on the 12v line (maybe 300w?).

like that, I've decided to get a big one, so I never have to worry any more.