On Sat, 26 Mar 2005 10:40:18 -0800, Stephen Trapani
wrote:

So, say I've got a measley 2 group 27s and my old Yanmar 2GM15 and I
want to by a 2300watt continuous inverter. BUT...

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A pair of group 27s is totally inadequate for a high powered inverter,
and as others have pointed out, your alternator is not big enough to
make up the shortfall. My recommendation would be (4) 6 volt golf
cart batteries in series parallel. They have about the same foot
print as an 8D but are a couple of inches higher. The 4 golf carts
will deliver 100 amps continuously for over 1/2 hour and
intermittently for quite a bit longer. They can be purchased at Sam's
club for about $50 each and are light enough to be easily handled.
Don't skimp on the battery cables, nothing less than 2/0 will be big
enough.