http://www.analyticsystems.com/Original%20Site/products/bcd305.htm
A quick look online has that at over $800.
This one handles a good load but is likely going to come at a cheaper price tag (relatively speaking):
http://www.pmariner.com/productFeature.php?ProductNum=05504
I'd go solar before one of those. The powerstream was a lower cost option to me with the compromise of slower charge rates.
or this might be best …
http://www.surepower.com/pdf/trailchargerflyer.pdf
example of use of “TRAIL CHARGER”
ftp://ftp.maxonlift.com/TechPub/msheets/M-05-03A_EO11020.pdf
Lacks stage charging if that matters to you at all.
how long does the powerstream unit take to recharge the optima?
have you considered removing the isolator?
what about the interaction between the converter and the solar charge controller?
These questions to me? The power stream is sitting on the floor of the camper waiting to be wired in when I get back tomorrow night from 10days of work travel so no data yet.
I'm leaving saturday for 2weeks on the road with the camper and should have some data then.
I don't have an isolator just an on/off switch that is powered by an ignition hot, again assuming you are talking to me.
I don't have solar but have thought if I do pursue it down the road and buy something under 7.5amp that I could get away with a cheaper PWM controller and input it into the powerstream to obtain stage charging without having to buy a more expensive MPPT charger with stage charging. Do note that you'll be loosing efficiency with a PWM controller verse MPPT though.