Just want everyone needs, another potential grounding issue! Here goes;
I modified a Dell Z750p 63 amp, 120v to 12 volt server power supply to feed a 40 amp Renogy DC-DC converter, for a "shore power" connection of sorts.
Mains power --- Dell PSU --- DC to DC converter --- battery --- inverter.
My trailer mounted system is floating (if I understand the term correctly), inverted AC is isolated, I don't run any loads through the frame, and all DC loads have dedicated negative wiring.
However, there is continuity between the AC mains ground, and the DC rail of the PSU (as well as the case). Which means that while the DC to DC charger is plugged in to the PSU, the entire system has a "real" ground, through the negative DC wiring.
From what I understand, that is okay when all is well. BUT, if a ground fault were to occur, on either the PSU, inverter, or on the mains side, what would happen? I wouldn't want any AC current going up (or down) the negative rail. I also wouldn't want the normally safe, low voltage, DC wiring becoming live and shocking someone, or frying everything attached to it.
Should I figure out how to isolate the DC side of the power supply from the AC ground? I'm pretty sure the continuity comes from the PCB being mounted to the metal case, and isn't "hardwired", so I could probably add insulation to isolate the AC and DC sides if necessary.
Any help or advice is appreciated!
I modified a Dell Z750p 63 amp, 120v to 12 volt server power supply to feed a 40 amp Renogy DC-DC converter, for a "shore power" connection of sorts.
Mains power --- Dell PSU --- DC to DC converter --- battery --- inverter.
My trailer mounted system is floating (if I understand the term correctly), inverted AC is isolated, I don't run any loads through the frame, and all DC loads have dedicated negative wiring.
However, there is continuity between the AC mains ground, and the DC rail of the PSU (as well as the case). Which means that while the DC to DC charger is plugged in to the PSU, the entire system has a "real" ground, through the negative DC wiring.
From what I understand, that is okay when all is well. BUT, if a ground fault were to occur, on either the PSU, inverter, or on the mains side, what would happen? I wouldn't want any AC current going up (or down) the negative rail. I also wouldn't want the normally safe, low voltage, DC wiring becoming live and shocking someone, or frying everything attached to it.
Should I figure out how to isolate the DC side of the power supply from the AC ground? I'm pretty sure the continuity comes from the PCB being mounted to the metal case, and isn't "hardwired", so I could probably add insulation to isolate the AC and DC sides if necessary.
Any help or advice is appreciated!