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2 or more power supplies in parallel?
I found a great deal on some 12V 13A switching power supplies ($19).
While 13A is enough for most of what I want to do, I use a few things that require more current. So I was considering getting 2 or 3 and hooking them up in parallel. Will this cause any problems since one will always be putting out a slightly higher voltage than the other no mater how close you adjust them? Also, as an alternative, I was thinking of maybe just putting a 22 Ah Sealed lead acid battery in parallel to take up the slack the power supply couldn't. In this case if I had 25A load would the power supply carry 13A and the battery carry the rest? -- Chris W "They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety." -- Benjamin Franklin, 1759 Historical Review of Pennsylvania |
#2
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2 or more power supplies in parallel?
"Chris W" wrote in message ... I found a great deal on some 12V 13A switching power supplies ($19). While 13A is enough for most of what I want to do, I use a few things that require more current. So I was considering getting 2 or 3 and hooking them up in parallel. Will this cause any problems since one will always be putting out a slightly higher voltage than the other no mater how close you adjust them? Also, as an alternative, I was thinking of maybe just putting a 22 Ah Sealed lead acid battery in parallel to take up the slack the power supply couldn't. In this case if I had 25A load would the power supply carry 13A and the battery carry the rest? -- Chris W "They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety." -- Benjamin Franklin, 1759 Historical Review of Pennsylvania I don't see a problem with running the supplies in parallel. Most supplies you can "Tweak" the output voltage. Set them individualy for the desired output, then parallel them. Even if they are off a little, it should not harm anything. If you want to be certain, put a rectifier diode in the + output (anaod to + terminal, cathode to load and other supplies). That will prevent another voltage source from backfeeding into that supply. The disadvantage is you will loose around 0.7V across the diode, but you may be able to adjust the supply for that loss. |
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