Purpose The purpose of this project is to help you approximate the size of a battery bank and solar array based on the load (number of devices) you plug into the battery bank. If you already know the total amps of your load, or the volts and watts you can go straight to the "DC Battery Bank Calculator". 
Device Calculator Input any two values to get the third value. Remember, batteries are DC so you need to input values that are based on the DC required by the device. As an example, the Insignia 22" LED TV has an AC plug (120VAC) but the LED TV has a DC plug rated at 12VDC/3Amps  you would enter 12 and 3 NOT 120. Calculations that derive voltage are assumed to be DC. All devices should have the same voltage rating.
The device with 12 Volts and 100 Watts has 8.33 Amps.

Device Load Calculator This section allows you to input the rating of a collection of devices (input each device in the "Device Calculator" to the left). Once entered, this section totals the voltage/wattage/amperage that your collection of devices draws (this is the load). Those numbers then can be used to determine the size of your battery bank (the "DC Battery Bank Calculator" below). 

Solar Array Needed For Battery Bank The solar array puts power into the battery bank. In order to determine the size of the solar array, ensure the battery bank calculations have been made (to the right). You can alter hours of sunlight the array receives which will control how many watts the array must collect. 
DC Battery Bank Calculator In order to calculate the amphours (Ah) which determines how much power must be stored in the battery to supply power for the devices you have plugged into it, supply the following information. Hint: Voltage should never exceed battery voltage  many devices have 12VDC adapters; in order to determine number of watts or amps, add up the watts each device needs or add up the amps each device needs when plugging in each device to the battery bank. Select The Information You Have:
Calculations include offsets of an energy conversion percentage of 85% (from battery to a device) and that the devices are highdemand (that is, they are always drawing power).


Solar Panel Calculator Input any two values to get the third value.
The solar panel with 12 Volts and 100 Watts has 8.33 Amps.
