I originally wanted to have a/c off shore for the few evening we are relaxing before and after the fireworks in the evening or the daytime air shows in Gary and Chicago while we are anchored. but....
Everywhere I read that it isn't practical but I figured what the heck and installed a 10,000 watt inverter and a battery bank of 6 group 29 (210 reserve each) walmart batteries. I already have 3 interstate group 24 batteries installed.
Material list to power my 16,000 btu marine
1. set of four 3ft 0 gauge cables
and set of three 3ft 2 gauge cables
2. 40 ft 10 gauge shore line power cord cut down to 15 ft.: $50
3. 10,000 watt wagen tech modified sine inverter $940
A/C LRA rating is 62 amps so I figured 7440 startup watts
4. 6 walmart maxx-29 batteries: $480
so about $1700
how well did it work? I used it on memorial day for about 4 hours with the outside temp over 90 deg. I already had the cabin cooled down from shore power
and did some stop watch tests at different temperatures to try to find the optimal settings. I decided to set the thermostat at 74 deg. We used the microwave and had 32" led tv consuming about 80 watts (why the kids
watch tv on the lake.. who knows) and the fridge but the water
heater was shut off.
After four hours I did notice the battery bank was getting close to 12 volts. The starboard engine
cranked over little slower so I used the para switch.
In conclusion, if I only deplete my bank about 50% which I am sure I was very close to doing I would imagine I wouldn't get much more out of that bank. I'll test it next weekend by setting the thermostat to 78 deg.
My next step is to install a couple of 120 amp alternators. I really didn't want to install anything larger if I have to deal with changing the pulley and belt sizes and upgrading the wiring
to handle the larger load. I figured if we cruised about 3 hours in a day (Chicago and back) that will help to get another couple of hours plus out of it???? That's my thoughts.
My other concern is the time to recharge these suckers when docked. I have a 20amp 2 bank charger
installed. I am curios if I stick a 30 amp smart charger
on the bank will it charge at 50 amps??