MegaWatt S-400 as boost charger up in smoke
It looks like this discussion is archived and can't be reopened (another example of some topics being locked up that are best kept open because the solution remains relevant), but that's another topic...
Forum Discussion
I used a 23$ budget Megawatt coined the cheapowatt.
Rated for 30 amps it would output close to 38 amps. Over 36 amps it made this sound which said things were not right.
So I had to limit amperage to 36 or below by starting lower on the voltage scale and twiddling the potentiometer upward often. to keep it in the 30 to 26 amp range.
i had rigged up a better potentiometer, i had increased heat dissipation with a better fan and some better mating of heatsink with casing.
Eventually i got tired of the pot twiddling, and i set it to 14.8v unloaded, hooked it to a depleted battery and away it went, making that 'not right' noise.
It lasted 17 minutes.
I then bought the Meanwell RSP-500-15, and have been using that since september 2014 as a 40 amp charger converter floater equalizer, everything.
I have increased its ventiation and heatsinking, and it has thousands of hours on it. Its voltage range is 13.12 to 19.23v.
No personal experience with the Megawatt. I suspect the fans re culprits in the failure. The internal 60MM fans have a lot of restriction behind and in front of the fan. I had moved the fan to the exterior of the casing to reduce restriction.
My MEanwell has a 40 and a 60MM fan on the lid, 40MM blowing in 60MM sucking out. The MW comes with a very loud powerful 40MM fan, but my ther fans keep it off below 32 amps of output.
Send your 'boat anchor' to Mexwanderer.
Rated for 30 amps it would output close to 38 amps. Over 36 amps it made this sound which said things were not right.
So I had to limit amperage to 36 or below by starting lower on the voltage scale and twiddling the potentiometer upward often. to keep it in the 30 to 26 amp range.
i had rigged up a better potentiometer, i had increased heat dissipation with a better fan and some better mating of heatsink with casing.
Eventually i got tired of the pot twiddling, and i set it to 14.8v unloaded, hooked it to a depleted battery and away it went, making that 'not right' noise.
It lasted 17 minutes.
I then bought the Meanwell RSP-500-15, and have been using that since september 2014 as a 40 amp charger converter floater equalizer, everything.
I have increased its ventiation and heatsinking, and it has thousands of hours on it. Its voltage range is 13.12 to 19.23v.
No personal experience with the Megawatt. I suspect the fans re culprits in the failure. The internal 60MM fans have a lot of restriction behind and in front of the fan. I had moved the fan to the exterior of the casing to reduce restriction.
My MEanwell has a 40 and a 60MM fan on the lid, 40MM blowing in 60MM sucking out. The MW comes with a very loud powerful 40MM fan, but my ther fans keep it off below 32 amps of output.
Send your 'boat anchor' to Mexwanderer.
