Mean Well RSP-500-15 Switching Power Supply
IT just arrived. Initial impressions: Much heavier than the cheapowatt 1/2" wider, 1/2 inch longer and almost 1/2 inch less High than cheapowatt. The casing is about 50 to 75% thicker aluminum t...
Forum Discussion
Well, I opened her up, Got the 10 turn pot wired in.
It fought. It was frustrating, I cursed a lot.
The old 1000 OHM POT did not want to come out, The solder sucker gun, and the solder wick were not able to pull all the solder out. The holes in the CB were tiny. There were other tiny resistors on the bottom very close nearby and I found my unaided eyes, and my smallest soldering tip were not adequate for the task. The cheapowatt's voltage trim pot pretty much fell out with some solder wick.
I tried heating the pins and pulling it out one leg at a time, and 2 legs left the pot and remained in the CB. One leg did pull out and I had to trim off half the wires on 22 awg wire to get it through the hole and solder it in. The negative wire I just soldered to one of the remaining legs.
Pot function was the same as Cheapowatt. Maximum pot resistance for minimum voltage, no resistance for max voltage.
The bottom of the CB:
Here are two transistors on the port side covered in their grey casing.
I slid one of the cases off the transistor. There was thermal grease inside too. Unfortunately the flash obscured the letters and numbers. i tried to adjust brightness and contrast, but no dice, and I only took the one photo.
I made sure to get more thermal grease on this heatsink as they were a little light.
These white wires are thermal sensor wires attached to a threaded C channel which is on the 2 largest transistors and pulls them tight to the case. These are perhaps a little bigger than the cheapowatt transistors. I could not get the grey casing off these, sorry mex.
So the good news, voltage range is now 13.12v to 19.23v with new pot, down from 13.34v to 19.23v.
So Whohoo! 13.12v is low enough for the screwy 31 at any temps I am likely to float it at.
Also with 60MM fan blowing into case, and 80MM fan exhausting case, the loud 40 MM fan never turned on when maxed out at over 40 amps on the depleted AGM.
So double freaking who HOO!!
These two Noctua fans are whisper quiet. I can hear them from 2 feet away, but it is the sound of air moving, not a mini turbo jet like the 40MM fan.
The AGM pulls another amp out of the PSU compared to the screwy 31. Confirmed with my DC clamp on meter.
I've just got the trim pot taped to the lid for now. It is easy to adjust in 0.01, In fact it is a bit annoying going from 13.13v upto 14.70v.
I think a 5 turn trim pot would have been adequate, perhaps a 3 turn.
I clamped one semi shaped heatsink into the starboard recess. No adhesive, no screws It certainly got warm.. Once i get the rest of them shaped and drilled, I'll glue them the casing
It fought. It was frustrating, I cursed a lot.
The old 1000 OHM POT did not want to come out, The solder sucker gun, and the solder wick were not able to pull all the solder out. The holes in the CB were tiny. There were other tiny resistors on the bottom very close nearby and I found my unaided eyes, and my smallest soldering tip were not adequate for the task. The cheapowatt's voltage trim pot pretty much fell out with some solder wick.
I tried heating the pins and pulling it out one leg at a time, and 2 legs left the pot and remained in the CB. One leg did pull out and I had to trim off half the wires on 22 awg wire to get it through the hole and solder it in. The negative wire I just soldered to one of the remaining legs.
Pot function was the same as Cheapowatt. Maximum pot resistance for minimum voltage, no resistance for max voltage.
The bottom of the CB:
Here are two transistors on the port side covered in their grey casing.
I slid one of the cases off the transistor. There was thermal grease inside too. Unfortunately the flash obscured the letters and numbers. i tried to adjust brightness and contrast, but no dice, and I only took the one photo.
I made sure to get more thermal grease on this heatsink as they were a little light.
These white wires are thermal sensor wires attached to a threaded C channel which is on the 2 largest transistors and pulls them tight to the case. These are perhaps a little bigger than the cheapowatt transistors. I could not get the grey casing off these, sorry mex.
So the good news, voltage range is now 13.12v to 19.23v with new pot, down from 13.34v to 19.23v.
So Whohoo! 13.12v is low enough for the screwy 31 at any temps I am likely to float it at.
Also with 60MM fan blowing into case, and 80MM fan exhausting case, the loud 40 MM fan never turned on when maxed out at over 40 amps on the depleted AGM.
So double freaking who HOO!!
These two Noctua fans are whisper quiet. I can hear them from 2 feet away, but it is the sound of air moving, not a mini turbo jet like the 40MM fan.
The AGM pulls another amp out of the PSU compared to the screwy 31. Confirmed with my DC clamp on meter.
I've just got the trim pot taped to the lid for now. It is easy to adjust in 0.01, In fact it is a bit annoying going from 13.13v upto 14.70v.
I think a 5 turn trim pot would have been adequate, perhaps a 3 turn.
I clamped one semi shaped heatsink into the starboard recess. No adhesive, no screws It certainly got warm.. Once i get the rest of them shaped and drilled, I'll glue them the casing
