Yep, you have the ALS-500 the SGC Smart Cube and the Tokyo Hi-Power 400 watt offering.
Most guys who mobile with amps use a rather large battery AT the amplifer, in addition to heavy gauge cables from the primary auto battery - This allows the battery to compensate somewhat for the voltage drop.
From what I've read, the SGC is pretty robust and will take lower voltages fairly well, but most of them will draw a max of 80 amps or so - SGC says 40 average on SSB.
Your main concern when running on storage batteries alone is the voltage drop - it's going to take a fair sized battery bank to give you an average of 40 amps for very long.
I don't have any good advice but it would not surprise me if 200+ amp/hour capacity is needed to give a couple of hours of amp operation - although when receiving obviously the draw is much less.
So then the operative question is 'how big IS your house battery?'
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