forced air atwood furnaces in fishouses-suck batteries?

[mrmillelacs]

thinking about a new fish house or maybe a used one-something nice-i see a lot of the new ones have a furnace that has a blower-my question is if anybody has one of these-how long do the batteries last-im also thinking about the 12 volt lites-maybe a small tv-and do these furnaces put out heat al all if the batteries are dead--thanks a lot

[Bryce]

Gets very cold when the juice runs out. Usually happens about 3 in the morning after a busy night of beverages. Can't remember what brand I use. Believe it's a 16,000 btu model. Heats a 8 x 16 vee fairly well even down to -30 with wind. Going to add a 12 volt fan in the rear to get improved airflow this year. 2 12 volt deep cycles in parallel will get me close to 3 days. Have 3 12 volt lights, car stereo, and 12 volt receptacles running off it also. Have never drained the batteries all the way down as they seem to go dead at the most absolute inoportune time with this method of charging. I know math is math but swear I get more than double the time out of 2 batteries hooked together.

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IBOT's # 17 & 248