Help with diode choice for connecting series power supplies

DuncanS

10 mW
Joined
Mar 17, 2016
Messages
24
Location
Sharm El Sheikh, Egypt
I have an icharger 306b and am currently powering it with a 12v 40a smps (meanwell s480 12) . That does not let me use the full potential of the charger. I have a second identical power supply and want to connect them in series to give a 24v 40a supply. This will allow me to as good as max out the charger, approx 900w leaving a little headroom. I am happy with all that. Now I have hunted about and see the recommendation is to add a reversed biased diode across the outputs of each supply to protect the power supply in case 1 of the supplies goes down etc.

I am unsure of a suitable diode for this. The things I have found recommending this simply say choose an appropriate rated diode. Does it need to handle 24v 40a or 12v 40a? When looking up diodes a lot of blocking diodes pop up for use with solar panels tec. I am a bit out of my depth with this so was hoping some far smarter person would be able to recommend a suitable diode for this application. It needs to be sourced in the UK. Thanks in advance, Duncan.
 
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