I can't say specifically about the M600, but I use my M710
off of batteries with no problems. It draws 25A or so when
transmitting but that is peak power when using SSB so the
average is much lower. If you are using digital modes like
PACTOR then the power drain is higher. Still, I can do
everything I need to do without running the engine.

Doug, k3qt
s/v Callista

"Gordon Wedman" wrote in message
news:L9hjc.19528$en3.14177@edtnps89...
I noticed in the manual for my Icom M600 that they recommend transmitting
only with the engine running. I assumed this was to offset the high
current
draw. I also noticed they show 13.6 volts as the supply voltage so now
I'm
wondering if this is another reason for having the engine running? Will
the
radio not transmit at full power if it doesn't get 13.6 volts? I figure
my
4 T-105s can supply the current but they don't supply 13.6 volts.