New to me boat, Need help with shore power wiring

[jmschmidt]

Inverters have a habit of going nuts when trying to power devices with large reactive loads like aircon, winches and windlesses. All the big cats I have seen have two shore power cables and employ two A/C current load groups which power divide the aircon units, the electric side of hot water heaters and other A/C devices between them. In a standard marina set up usually only one A/C load group can be powered at a time. Of course, one group could be shore powered and one genset powered simultaneously.

[CharlieJ]

All is not lost...consider DC A/C units. Termodynamica and Mabru are both very efficient.

[captstu]

I ran my 16 KBTU per hour air conditioning on alternator with a large battery bank for five years. If I pre-called the boat the air condition would run all night and sustained a temperature without running out of the generator which I did not have or either engine.

[S/V Illusion]

Originally Posted by Redline452

Almost right except for the use of "hrs" where it doesn't belong. The OPs error was comparing aircon current consumption at 120VAC with inverter current consumption at 12VDC.



I think you confused the amp draw. .

Absent an indication of duration, the amps drawn is meaningless, e.g., 12 amps per hour vs. 12 amps per year. Consequently, it's important to denote draw rate