Battery Sizing Calculator

#Watts(W)Total Wattage Required		#Hours(Hrs)Number of Hours system has to be working		Number of Watt Hours(WH)
System Voltage (V)Voltage required for the system (6,12,24,48,..)		Average daily AMP Hours
Days of Autonomy (Days)Number of days you expect the battery to run without being Charged. Depends on the sunlight availbility in your area (0,1,2,...)		Average daily AMP Hours
Depth of Discharge (%)Batteries should not be discharged below a certain percentage for longer life(for example a value of 25 here indicates that you will allow the battery NOT to discharge below 75% of full charge(any value 0 to 100)		Average daily AMP Hours
Chosen Battery Voltage (V)Voltage of the Battery chosen. This should be less than and in multiples of System Voltage(6,12,24,48,...)		Number of Batteries in Series(per String)
Chosen Battery Amp Hours (AH)AmpHour rating of the battery that you are purchasing, Type 240 for 240AH. Check Battery Specifications		Number of Strings (in Parallel)		Total Number of Batteries

Solar Array Sizing Calculator

Average Daily Consumption(WH)
System Efficiency (%) Solar array may not produce all 100% of power specified due to enviornmental factors such as dust, etc. Acceptable values any number from 0 to 100. Typically 90		Modified Daily WH Requirement (WH)
Peak Sun hours/day (Hrs)Average number of hours you expect the Sun to be available per day. Depends on latitude and season. Use worst case. Check websites. Any value from 0 to 24.		Power required per hour (Watts)
System De-rate factor (%)All systems are not 100% efficient due to lossess available per day. Acceptable values any number from 0 to 100. Typically 90		Modified Power required per hour (Watts)
Watts of Selected Solar Module (Watts)The Wattage produced by each solar panel that you will purchase		Number of Solar Panels