Difference between revisions of "Detailed DC system design"

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|= 140 Wh
 
|= 140 Wh
 
|}
 
|}
 +
 +
==Load and solar resource comparison==
 +
 +
21.66623678
 +
25.89395808
 +
23.35798899
 +
24.00274317
 +
19.59777892
 +
20.99475131
 +
19.96672213
 +
18.26404592
 +
33.1047529
 +
19.55125221
 +
19.72664506
 +
23.73149508
 +
 +
{| class="wikitable" border=1
 +
!Month
 +
![[Weather and solar resource evaluation#Solar resource (insolation)|Average daily insolation]]
 +
![[Load evaluation#Average daily Watt-hours required|Average daily Watt-hours required]]
 +
!Ratio
 +
|-
 +
|January
 +
|193.85 kWh/m² / 30 = 6.46 kWh/m²
 +
|140 Wh
 +
|21.67
 +
|-
 +
|February
 +
|162.2 kWh/m² / 30 = 5.41 kWh/m²
 +
|140 Wh
 +
|25.90
 +
|-
 +
|March
 +
|(179.81 kWh/m² / 30 = 6.00 kWh/m²
 +
|140 Wh
 +
|23.36
 +
|-
 +
|April
 +
|174.98 kWh/m² / 30 = 5.83 kWh/m²
 +
|140 Wh
 +
|24.00
 +
|-
 +
|May
 +
|214.31 kWh/m² / 30 = 7.14 kWh/m²
 +
|140 Wh
 +
|19.60
 +
|-
 +
|June
 +
|200.05 kWh/m² / 30 = 6.67 kWh/m²
 +
|140 Wh
 +
|20.10
 +
|-
 +
|July
 +
|210.35 kWh/m² / 30 = 7.01 kWh/m²
 +
|140 Wh
 +
|19.97
 +
|-
 +
|August
 +
|229.96 kWh/m² / 30 = 7.67 kWh/m²
 +
|140 Wh
 +
|18.26
 +
|- style="background-color:#F08080;"
 +
|September
 +
|126.87 kWh/m² / 30 = 4.23 kWh/m²
 +
|140 Wh
 +
|33.10
 +
|-
 +
|October
 +
|214.82 kWh/m² / 30 = 7.16 kWh/m²
 +
|140 Wh
 +
|19.55
 +
|-
 +
|November
 +
|212.91 kWh/m² / 30 = 7.10 kWh/m²
 +
|140 Wh
 +
|19.73
 +
|-
 +
|December
 +
|176.98 kWh/m² / 30 = 5.90 kWh/m²
 +
|140 Wh
 +
|23.73
 +
|}
 +
*'''Month:''' The month of the year.
 +
*'''Average daily insolation:''' Solar resource data obtained for the location from [[Weather and solar resource data sources]].
 +
*'''[[Load evaluation#Average daily Watt-hours required|Average daily Watt-hours required]]''' from load evaluation.
 +
*'''Ratio =''' Average daily Watt-hours required ÷ Average daily insolation

Revision as of 08:20, 8 December 2020

Location: Pampachiri, Apurimac, Peru
GPS coordinates: 14°11'37.65"S 73°32'31.73"W
Altitude: 3378m
Description: A two story adobe home in the Peruvian Andes with only DC power needs.

  • Photo of the home.

  • Location of the home.

DC load evaluation

# Load Quantity Watts Total watts Duty cycle Hours per day Days per week Average daily DC watt-hours
1 Cree 5 W LED 6 5 W 30 W 1 3 hours 7 days 90 Wh
2 Retekess radio 6 W 1 6 W 1 5 hours 7 days 30 Wh
3 Samsung cell phone 2 10 W 20 W 1 1 hour 7 days 20 Wh
Total average daily DC watt-hours 140 Wh
  • Load: The make and model or type of load.
  • Quantity: The number of of that particular load.
  • Watts: The power rating in watts of the load.
  • Total watts = Quantity × Watts
  • Duty cycle = Rated or estimated duty cycle for the load. If the load has no duty cycle a value of 1 should be used. A load with a duty cycle of 20% would be inputted as .2
  • Hours per day: The maximum number of hours the load(s) will be operated per day. If the load has a duty cycle 24 hours should be used.
  • Days per week: The maximum number of days the load(s) will be operated per week.
  • Average daily DC watt-hours = Total watts × Duty cycle × Hours per day × Days per week ÷ 7 days
  • Total average daily DC watt-hours = sum of Average daily DC watt-hours for all loads

Average daily watt-hours required

Average daily watt-hours required = Total average daily DC watt-hours + Total average daily AC watt-hours
Average daily watt-hours required = 140 Wh

Load and solar resource comparison

21.66623678 25.89395808 23.35798899 24.00274317 19.59777892 20.99475131 19.96672213 18.26404592 33.1047529 19.55125221 19.72664506 23.73149508

Month Average daily insolation Average daily Watt-hours required Ratio
January 193.85 kWh/m² / 30 = 6.46 kWh/m² 140 Wh 21.67
February 162.2 kWh/m² / 30 = 5.41 kWh/m² 140 Wh 25.90
March (179.81 kWh/m² / 30 = 6.00 kWh/m² 140 Wh 23.36
April 174.98 kWh/m² / 30 = 5.83 kWh/m² 140 Wh 24.00
May 214.31 kWh/m² / 30 = 7.14 kWh/m² 140 Wh 19.60
June 200.05 kWh/m² / 30 = 6.67 kWh/m² 140 Wh 20.10
July 210.35 kWh/m² / 30 = 7.01 kWh/m² 140 Wh 19.97
August 229.96 kWh/m² / 30 = 7.67 kWh/m² 140 Wh 18.26
September 126.87 kWh/m² / 30 = 4.23 kWh/m² 140 Wh 33.10
October 214.82 kWh/m² / 30 = 7.16 kWh/m² 140 Wh 19.55
November 212.91 kWh/m² / 30 = 7.10 kWh/m² 140 Wh 19.73
December 176.98 kWh/m² / 30 = 5.90 kWh/m² 140 Wh 23.73
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