Annual Electricity bill with and without system duplicated for FOM and BTM systems

[sjanzou]

With latest release, Create PVWatts Commercial system and run and check data tables

Same with PVWatts Single Owner with retail rate purchases

[cpaulgilman]

Variable names and labels for reference:

elec_cost_with_system, "Electricity bill with system", "$/yr"
utility_bill_w_sys, "Electricity bill with system", "$"

elec_cost_without_system, "Electricity bill without system", "$/yr"
utility_bill_wo_sys, "Electricity bill without system", "$"

Note these additional monthly variables in utilityrate5 are essentially duplicates:

year1_monthly_use_wo_system, "Electricity use without system", "kWh/mo"
load, "Electricity load", "kWh/mo"

year1_monthly_electricity_to_grid, "Electricity to/from grid", "kWh/mo"
year1_monthly_use_w_system, "Electricity use with system", "kWh/mo" (negative of "Electricity to/from grid")