On Sep 17, 7:11*am, Glenn Lyford wrote:
I'm looking to rectify 240 VAC into DC with 100 amp surge capacity.
The largest I found is 50 amp [...]
Do I need to come up with some way to put three in parallel?


I've always heard that diodes don't parallel very well, I think
because they won't always trigger at the exact same time,

The recommended way to rectify very high currents is with
paralleled rectifiers, each having a small series inductor.
The inductors don't waste energy, and keep the multiple
units at similar currents.

A 50A rectifier will carry 50A average, there's presumably repetitive
peaks
of (half-wave duty cycle) 140A involved in doing that. So, '100A
surge'
is just fine with the 50A rated rectifier. Maybe.

The other way to ensure current sharing is to separately
fuse all the rectifiers; the small resistance of the fuse is enough
to balance them, if you do it right.