It's been a while since I did the design, but if memory serves, the bigger
difference between the TLP190 and TLP191 was the presence of an internal
pull down resistor on one of them. Thus one needs an external resistor and
the other does not. Fuzzy memory seems to suggest that the current
difference was naught once you added the external resistor. Bear in mind
that since the turn off time is controlled by that pull down resistor,
your're never going to get very fast switching with a PV opto. Plenty fast
for 60 Hz mains work, but you need to plan for a considerably longer time
in the linear region while switching.

As to SSRs, not sure what you consider a "decent current rating", but a bit
of poking shows this candidate - good to 50A -
http://www.digikey.com/product-detail/en/D2450-10/CC1082-ND/221775 or this
one for 125A -
http://www.digikey.com/product-detail/en/H12WD48125-10/CC2007-ND/752475
Though with your suggested loads
http://www.digikey.com/product-detail/en/S212S01F/425-2412-5-ND/720407 may
be a more suitable choice.

Good luck
-Denny
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