| % of elec. bill to offset with solar | % | |
| Your annual electricity usage | kWh / yr. | |
| Solar hours per day [check yours here] | hrs. per day | |
| Days without sun to plan for | days | |
| Voltage of the batteries you will use | V | |
| Area of your South-facing roof (or yard) | ft² | |
| You must have a clear view of the Southern sky with no trees! | ||
| Watt rating of panels | W | |
| Area of each panel (height x width) | ft² | |
| Voc rating for panel? [check the Data Sheet for the panel] | V | |
| Asc rating for panel? [check the Data Sheet for the panel] | A | |
This is what you need: | ||
| Your daily electric usage is | 28 | kWh/day |
| You need at least this many watts of panels | 8.22 | kW |
| # of panels needed | 18 | panels |
| Required area | 429 | ft² |
| You have sufficient space for your solar panel system! ☀️ If you need more space, you may need to mount some panels in the yard, or reduce your electric bill offset above. | ||
| Battery size needed | 2084 | Ah |
| Note: Most LiFePO4 batteries range from 100 - 400 Ah. | ||
| Note: 2x above battery size for Lead Acid battery. | ||
| You need an inverter(s) that can handle at least | 8280 | W solar input |
| And 853 V total per MPPT or 427 V each for 2 MPPTs | ||