Re: New to solar need some help
"Future upgrades" is one of those things that aren't so easy to do with solar. You need to look carefully at what you have/need/want now and what it will be "then". Too often the two designs will be so different that almost nothing can be saved for later use.
As Bill has demonstrated, your one 100 Watt panel won't actually meet the Watt hour needs you have now. As cruiser guy pointed out that inverter is going to use a lot of power on its own, and that's power you haven't got.
So right away it's decision-making time: do you buy more equipment now? If so, how much? Enough just to meet your needs at this moment? Or do you go whole-hog? Only you can make those choices.
In ballpark terms, your 100 Watt panel will supply about 250 Watt hours AC out the door. It could fully charge about 64 Amp hours of battery, which at most would give 384 Watt hours DC (from which all loads draw, including the inverter - thus the difference between AC and DC Watt hours). Can you do something with that? Or do you need to spend more money now?
Four 175 Watt panels, OB MX60, 232 Amp hrs, OB 3524, Honda eu2000.
Ohm's Law: Amps = Volts / Ohms
Power Formula: Watts = Volts * Amps