Living with Off-Grid Solar Power
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Solar Electric Power System Design Worksheet |
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| 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) | |||||||
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Averaged over one week (7 days) AC & DC Watt-hours/day | 3570 | 0 | |||||
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Add
more loads to table | |||||||
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| Step 2: Site Data | |||||||
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Average Daily Insolation
hrs Use Worst Case Data Usually during Winter Months |
Get Insolation Data | ||||||
| Step 3: Specify PV Array | |||||||
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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 | ||||
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Panel Wattage (Rated)
Watts | |||||||
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Total PV panels required:
14 |
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| Step 4: Specify Battery Pack | |||||||
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System Voltage
If DC Loads are specified, then System will usually be 12VDC Larger Systems will usually be 24VDC or 48VDC |
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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 |
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Battery Depth of Discharge
%
DoD > 50% greatly reduces battery lifetime DoD < 25% greatly increases battery lifetime |
Battery Charging Efficiency
%
Typical Range is 85-94% |
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| Required Battery Pack: |
Battery Type:
L16 Parallel Strings: 5 Each series string: Qty 4 Batteries Total Number of Batteries: 20 |
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