Join Date: Feb 2010
Location: Narragansett Bay
Thanked 315 Times in 295 Posts
Rep Power: 8
I have a 2000 watt invertor and a 400+ah house bank. I'm usually the first up in the morning and don't like firing up the genset if others are sleeping. I will occasionally use the invertor to make a pot.
I don't have the actual usage mathematics, but this is our experience. We will fully charge the house bank with the genset around dinner time the night before. For the rest of the evening, there will be a few lights on until everyone goes to sleep and the anchor light will be on all night, of course. The fridge and bilge pump also remain on and the freshwater pump with run a handfull of times. After whatever small usage that consumes through the night, one pot of coffee through the invertor in the morning and the bank is done. I don't mean stone cold, but it drops below the level that requires recharging. You can see the incredible drop in amperage draw when the heating element clicks off on the pot. Once the coffee itself wakes everyone up, the genset runs to get us back to charge. I don't think this is a very practical way to plan to make coffee every time.
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In the harsh marine environment, something is always in need of repair. Margaritas fix everything.