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mrultralite · 07-21-2014, 05:32 PM

i notice some articles showing how connect 2 pc power supplies seem quite complicated more so because they are not the ones i'm using. i thought i could just create another 12v supply and connect it in series w/ banana plugs? yes?

Bladecpnitro · 07-21-2014, 06:22 PM

Just a computer power supply may not carry the amps you need.
A server power supply does though like this Hewlett Packard DPS-600PB (12V, 47 Amps)
https://sites.google.com/site/tjingu...ts/diy-24v-47a

But yes connect the positive of one PS to the Negative of the other and run the other negative and positive to the charger. There is a pic at the bottom of this page.

mrultralite · 07-22-2014, 04:58 PM

blade ,slyster, i don't know why i need those huge PS, at most on my 308 i''ll be charging 2 6s and 6, 3s so thats

2.2amp x 22v = 48 x 2 , say 100 watts

plus

1.2amp x 12v =15 x 3 =43 x 2 = say 90 watts

so 200 watts . i can buy cheap 500 W PS locally , i'd rather not pay mark-up + ship on the larger server supplies.

where's my mistake ? thanks.

sdunne · 07-22-2014, 05:06 PM

Connecting two in series can be done, but you have to be careful because some power supplies negative out, goes to earth on the metal case. When that is the case if the two touch you get a short.
The negative out on one supply has to be isolated off the case, to make it safe.

If you are charging at such low amperage why go 24v, just use a single 12v.

More amps let you charge faster, for bigger packs its essential, unless you have all day.

mrultralite · 07-22-2014, 05:16 PM

thanks i do have all day lol ,
didn't know i could charge them faster

but i like to be conservative in these matters so i don't burn the house down.

Slyster · 07-22-2014, 05:28 PM

faster is cheaper. 3C charges gets it done in 13-15 mins.. now you can field charge and only need 2 packs per heli.

mrultralite · 07-23-2014, 12:52 PM

dunne, thats a good point about neg/ground both the PS i have fail the test, which makes me think the choices are quite limited

ok , i see how remove one ground connection to case.

AND i need good instructions on how to, most all are badly written, i've done a single before. Ie do i disconnect BOTH grounds?

ps , more research, this is a tricky business, i'll stick with one till i know what i'm doing

07-21-2014, 05:32 PM	#1 (permalink)
mrultralite Registered Users Join Date: Jun 2011	24v power supply i notice some articles showing how connect 2 pc power supplies seem quite complicated more so because they are not the ones i'm using. i thought i could just create another 12v supply and connect it in series w/ banana plugs? yes?

07-21-2014, 06:22 PM	#2 (permalink)
Bladecpnitro Registered Users Join Date: Mar 2011	Just a computer power supply may not carry the amps you need. A server power supply does though like this Hewlett Packard DPS-600PB (12V, 47 Amps) https://sites.google.com/site/tjingu...ts/diy-24v-47a But yes connect the positive of one PS to the Negative of the other and run the other negative and positive to the charger. There is a pic at the bottom of this page. __________________ If its fixed don't break it!

07-22-2014, 05:28 PM	#6 (permalink)
Slyster Registered Users My HF Map location Join Date: May 2008	faster is cheaper. 3C charges gets it done in 13-15 mins.. now you can field charge and only need 2 packs per heli. __________________ "It's not just a hobby... it's a lifestyle" - Pete ϟ MINNESOTA! Goblin 500 + 700 / SK540 / Jives / DX8 / Quantum / RJX servos / 306b / Deep cycles

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07-22-2014, 04:58 PM	#3 (permalink)
mrultralite Registered Users Thread Starter Join Date: Jun 2011	blade ,slyster, i don't know why i need those huge PS, at most on my 308 i''ll be charging 2 6s and 6, 3s so thats 2.2amp x 22v = 48 x 2 , say 100 watts plus 1.2amp x 12v =15 x 3 =43 x 2 = say 90 watts so 200 watts . i can buy cheap 500 W PS locally , i'd rather not pay mark-up + ship on the larger server supplies. where's my mistake ? thanks.

07-22-2014, 05:06 PM	#4 (permalink)
sdunne Registered Users Join Date: Feb 2011	Connecting two in series can be done, but you have to be careful because some power supplies negative out, goes to earth on the metal case. When that is the case if the two touch you get a short. The negative out on one supply has to be isolated off the case, to make it safe. If you are charging at such low amperage why go 24v, just use a single 12v. More amps let you charge faster, for bigger packs its essential, unless you have all day.

07-22-2014, 05:16 PM	#5 (permalink)
mrultralite Registered Users Thread Starter Join Date: Jun 2011	thanks i do have all day lol , didn't know i could charge them faster but i like to be conservative in these matters so i don't burn the house down.

07-23-2014, 12:52 PM	#7 (permalink)
mrultralite Registered Users Thread Starter Join Date: Jun 2011	dunne, thats a good point about neg/ground both the PS i have fail the test, which makes me think the choices are quite limited ok , i see how remove one ground connection to case. AND i need good instructions on how to, most all are badly written, i've done a single before. Ie do i disconnect BOTH grounds? ps , more research, this is a tricky business, i'll stick with one till i know what i'm doing

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