how to mod those power supply? meanwell clone

[izeman]

i saw that offer and just couldn't resist. i don't know why i like chargers and stuff that much that i can't get enough of it
http://www.aliexpress.com/snapshot/6121834579.html for $20 and $10 for shipping it's a bargain.
of course i didn't look close enough and ordered the 60v version but need the 48v version. so i ordered a second one. but now with this on sitting here useless i wondered if those can be modded for a higher bandwith? anyone knows how they work and if this can be done?

this is the ouside:


and opened it. the fan connector was quite loose so a bit of hot glue to secure it will be added:


and this is the board from above:

 

[izeman]

just to make sure: i KNOW that thread http://endless-sphere.com/forums/viewtopic.php?f=2&t=42793
but the mainboard looks completely different so i'm not sure if the same mods apply.

 

[wesnewell]

Hot glue will likely melt inside. Use silicone calk.

 

[izeman]

Hot glue will likely melt inside. Use silicone calk.

yes sure. i used hot glue as synonym for something that sticks

 

[izeman]

i just found this site showing all mods http://www.recumbents.com/wisil/e-bent/meanwell/default.htm

 

[mcintyretj]

Izeman, I have the same charger and have been using it the last few weeks to charge my 15s 25ah HK lipo pack as well as my 15s Makita pack. I left it on for about 2 hours after it hit 62 volts (what I set it to at no load) to make sure it did not climb under load. I also played with the "V" adj plastic screw and adjusted it down to 53v but it might go lower, so I think it can charge a 13 to 16s HK lipo setup with no modifications. If you need to lower the Amps, you could buy a pack of high wattage, 100 ohm resisters from radioshack for about $3.00, and run them in parallel with your battery.

The fan does make some noise but it seems to do a good job keeping the unit cool. Hopefully it will last long enough to get my $30.00 worth.

 

[Skedgy Sky]

My unit from the outside looks a bit different but board looks the same (or close enough).

What mods are you looking to do on it?
Getting a wider voltage range would just mean modifying the resistor network around the variable pot. ... I believe I bypassed one of the resistors leading up to the potentiometer and the pot itself. I made a little removable resistor network for mine

Something like... a 5.49k resistor = 37.5V
4.84kohms = 41V
and so on..
For different batteries, I connect a different resistor combination to the wire hanging out of my unit to get the right voltage.

I have two 36V units in series. Output range is from about 25V to 55V after mods ... don't remember exactly.

and lastly more solder to shunt = more amps, but haven't touched it on mine as I'm fine with 7 amps continuous) about 700W if charging a 24s lipo with the two in series)

 

[izeman]

i ordered a dual volt/ampmeter (red/blue) and 5k and 2k potis. those will be installed in the case so i can adjust volts/amps from the outside.
this is a just for fun project. i have enough emc/kingpan chargers, but if i see a new one to play with i can't resist.

 

[Hillhater]

These "clones" are available as variable voltage units.
I have a 0-24volt, 350 watt unit, that actually works up to 29volts @ 15amps......cost $30 delivered.
It works fine with a CC/CV charge profile....IE charge drops to 0.1amp once the set voltage is reached.
Ideally it would need a cut off relay, but a wall timer does the same job.

 

[izeman]

with 0.1 amp charge those should be great for balancing a pack with a bestechpower d131 bms which has 140mA bleeding. i will mod them and see how they work as a backup/2nd office charger. o