So, exactly how big a battery do I need to go 100% off grid

% of days coverage by battery size for a 10 kW Solar system
% of days coverage by battery size for a 15 kW Solar system
% of days coverage by battery size for a 20 kW Solar system

Data and Methodology

Residential solar pv system (courtesy : energysage.com)

Steps

1: Analyze solar generation data

Solar Inverter data: Total Solar Energy production in last 10 years (in kWh)
Average daily Solar Energy (kWh) production data over 10 years for a 5.59 kW system
Sum of Solar Energy (kWh) avg 1kW in perfect orientation

2. Analyze meter data

Average daytime and nighttime total electricity purchased data from meter

3. Calculate daytime and nighttime consumption

Daytime and nighttime electricity consumption throughout a year

4. Derive the results

The result and the graph above (in result section) are summarized by this data.

Footnote

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