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| Use this worksheet to
determine the total energy in amp-hours per day used by all the AC and
DC loads in your system.
To find average sun-hours per day in your area (line 3), check local weather data, look at the map here or find a city here that has similar weather to your location. If you want year-round autonomy, use the lowest of the two figures. If you want 100% autonomy only in summer, use the higher figure. If you have a utility intertie system with net metering, use the yearly average figure. The peak amperage of the module you will be using can be found in the module specifications. You can also get close enough if you divide the module's rated wattage by the peak power point voltage, usually 17 to 17.5 for a 12 volt module or 35 to 35 volts for a 24 volt module.
|
| Nominal System Voltage | Number of Series Connected Modules Per String | |
| Volts | 12V Module | 24V Module |
| 12 | 1 | N/A |
| 24 | 2 | 1 |
| 48 | 4 | 2 |