Re: Need online solar calculator that calculates return on investment, monthly savings,
Once again much depends on where you are at. Up here you couldn't even buy the panels for $2 a Watt (even out of Arizona; once you cross the border the costs mount up). Weigh it against the ten cent electric and you get a payback time of around "never" (the equipment may need replacement before any value is realized).
But I agree with Rolland that any such calculator ought to allow you to put in your particular costs, not a generic $ number.
Four 175 Watt panels, OB MX60, 232 Amp hrs, OB 3524, Honda eu2000.
Ohm's Law: Amps = Volts / Ohms
Power Formula: Watts = Volts * Amps