Thanks for the feedback.There’s more to sizing the system than just adding up loads. We’ve never had our 200Ah batteries down to 50%, probably below 60% less than a dozen times in 5 years. Yet when these batteries die, I will upgrade to 300Ah and I look forward to the day. Why? Draw-down voltage.
We use our 700W MW (1100W draw) every day. There is also the high-draw Instapot. When the batteries get down to 75% or so, the inverter can get unhappy when these heavy draws pull the voltage down. (800W water boiler and Sous Vide are not as much a problem.)
Seriously consider the Sous Vide for heating water. Do the heating when you have solar, alternator or shore power. Use the water when you want. No mixing, no wasted water, no plumbing. If 105° shower feels good, heat to 105°, or a bit more if it’s going to be a while.
See my build blog for details.
"There’s more to sizing the system than just adding up loads. We’ve never had our 200Ah batteries down to 50%..."
are you implying that once I have added up my loads I should double it, to figure out what size battery I need so that it's never down to 50%?
I'm googleing the Sous Vide now, thank you