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Originally Posted by Kevin Sevcik
Sounds like the outputs are floating/isolated relative to each other,
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Yeah.
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so you should be fine connecting them in series to get your 38VDC that you're looking for.
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Even though they're isolated (so there's no leakage path), I still wonder:
1) These chargers are designed to source current, not sink it.
2) They're probably switching technology.
3) If one's switched "on" while the other's switched "off", then the "off" one sees the "on" one trying to push current through it. That's where I think Eric's earlier comment may come into play. Wish I knew more about this kind of stuff.
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For the record, I suspect two of your 3-prong output models might have been a problem, however.
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Hmm. I bet I've got another 3-prong one hiding somewhere. I'll see if I can find it and try it.