Do you have any pics of your existing fusing setup? And what brand/model of converter you have now? A web link to it if it does even exist any more helps cut down the leg work.
Odds are good that the extra amperage is only going to help provide more internal 12 vdc power to run lights, water pump etc and not necessary more battery charge power pending a few things.
Do you know the wire size in awg from the converter to the battery? And approx how long is it? What amp fuse is protecting this charge line? The voltage drop in the wire may be more your limiting factor then the converter. Sunline gave me a 60 amp convertor however the way it was setup with wire size and length, plus the 30 amp circuit breaker I could never get more then 25 amps into 2, Group 27 batteries.
What size battery do you have and how many?
What brand/model at you looking at buying?
As long as the fusing and battery charge rates/wire size check out, there may not be any issue. But I cannot tell that with out more info to base it on. See what you can dig up and let us know. We can help look for you.
I will be out camping this weekend (yeh!!) so I will not be back until Sunday. However we have several others here that can help too.
Current Sunlines: 2004 T310SR, 2004 T1950, 2004 T2475, 2007 T2499, 2004 T317SR
Prior Sunlines: 2004 T2499 - Fern Blue
2005 Ford F350 Lariat, 6.8L V10 W/ 4.10 rear axle, CC, Short Bed, SRW. Reese HP trunnion bar hitch W/ HP DC
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