Xantrex XW-MPPT-60-150: Squeezing 60 amps through a toothpick
It doesn’t smell too great in my office right now…. some Xantrex XW-MPPT-60-150 charge controllers just came back that are completely, totally burned up. SCORCHED. OWNED. PWNED. TEHPWNZRIATED.
All images are clickable for full resolution, as always (4000×3000 px)
First off, here’s why I think these blew up. Note the four small pins on the back of each contact of the large screw terminals. Each of them is probably 18 gauge… if even. It’s hard to judge since they’re square pins.
Up to 60 amps of current will flow through these little four-legged pieces of Chinese scrapmetal when the controller is running full tilt.
FYI, National Electrical Code requirements would call for AT LEAST 6 AWG assuming the conductors are copper — which they are not, they’re tin plated steel.
Aaaaaaand now, the results.
Burnt components and pieces of plastic fall out of the controller whenever it’s handled, and it’s left a wretched smell to permate my workspace. The copper PCB traces are still there and didn’t fuse, but the solder has melted away on them from the heating, and several components in the vicinity desoldered and fell right out of the controller.