Lochsa Design - Solar Electric System Design Worksheet

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Solar Electric Power System Design Worksheet
Step 1: Load Analysis
Qty	Load	Watts	hr/day	day/wk	Load Type	watt-hr/wk (AC)	watt-hr/wk (DC)
						819	0
						1650	0
						300	0
						300	0
						1800	0
						15120	0
Raw Watt-hours/week						19989	0
Inverter Efficiency (AC loads only)
Averaged over one week (7 days) AC & DC Watt-hours/day						3570	0
Add more loads to table

Step 2: Site Data
Average Daily Insolation hrs Use Worst Case Data Usually during Winter Months				Get Insolation Data
Step 3: Specify PV Array
Required Amp-hr per Day Derived from Load Analysis and Battery Voltage		142		Required Charging Amps from PV Array Derived from required Amp-hrs/day and average Daily Insolation			47.0
Panel Wattage (Rated) Watts
Total PV panels required: 14
Step 4: Specify Battery Pack
System Voltage If DC Loads are specified, then System will usually be 12VDC Larger Systems will usually be 24VDC or 48VDC
Battery Type T105s suitable for very small systems only Most systems use the L16 or L16HD Larger Systems benefit by using the KS-21s				Battery Reserve Capacity days Best range is 5-8 days, this minimizes Generator run time during long periods of cloudy weather
Battery Depth of Discharge % DoD > 50% greatly reduces battery lifetime DoD < 25% greatly increases battery lifetime				Battery Charging Efficiency % Typical Range is 85-94%
Required Battery Pack:			Battery Type: L16 Parallel Strings: 5 Each series string: Qty 4 Batteries Total Number of Batteries: 20