Schottkys are only really suitable for 12v. There are a few that have sufficient voltage rating to handle 24v but the volt drop of the higher voltage ones is a fair bit more than the low volt ones.
The single phase bridges can all be mounted on the same heat sink, they are isolated from the connections.
The 3 phase bridge is simplest to use but expect no more than half its nominal rating with battery charging loads and normal heat sinks. Using two single phase units gives much the same rating although in theory it looks as though it ought to be higher but I would still not run much over 18A.
If you use 3 units with the diode strings paralleled in each unit you would in theory be able to run near the 30A figure. With imperfect sharing you would still be better staying below 25A unless you can manage monster heatsinks.
You will not notice any difference in efficiency,it is there and you may be able to measure it on bench tests but under wind conditions you won't see any difference.
The potted bridges will need significantly more heat sinking than the schottkys so the actual diode loss is significantly more but the system loss is far less obvious.
For some reason the potted bridges seem to need much more heatsinking than decent stud mounted diodes although the published volt drops are not so different.
Flux
