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Location: Green Bay, WI | Anyone here install a separate battery for their electronics? If so, how are you charging it while underway?
I am strongly considering installing an extra battery, and then installing an automatic charging relay like this product:
http://bluesea.com/products/7650
I will also install a 4-bank shore charger as well, but I want to isolate these new electronics from the start circuit of the Optimax. The Opti has a 60-amp alternator, so that should work out great, especially if I troll with it. The boat doesn't yet have a kicker installed, but the 9.9 ProKicker has a 6-amp alternator and a 15hp ProKicker has a 12-amp alternator. I would think either one of those be plenty to keep the starting and electronics batteries topped-off while the kicker is running, as I seriously doubt that the marine electronics will draw 6 amps while running.
There will be two HDS 8 units (0.7A each with backlight on; 0.4A with light off), an LSS-1 (0.75A), an LWX-1 XM weather module, and a radio. There might be a 12-volt adapter for a tablet running as well. But even with a liberal estimate for the tablet and the LWX-1 module at 0.5A each, that's still only about 3 amps of current being drawn. So as near as I can tell, the system won't discharge while the kicker is running. Of course, the 15 ProKicker would give me extra power on the troll--at a penalty of about 35-40 pounds, and an extra $3-400 or so on the purchase. But the extra 5hp might be very useful in the wind with a high profile, like while trolling with the canvas up. The 9.9 ProKicker was NOT enough to control my 1850 Tyee in the wind, but this new boat is about 500 pounds lighter.
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