Tiny House Competition

Metering Results

Friday Oct 14, 2016

Photovoltaics

Each participant had a photovoltaic system. The solar power for the day is plotted below. In some cases, there is a dramatic drop in energy delivered by the PV system, which generally indicates that the batteries are fully charged.

The energy generated for the day is (kWh):

Fresno Laney Sequoias Berkeley Consumnes SantaClara SanJose Sacramento Chico
0.59 1 0.57 1.22 0.52 1.2 0.63 0.89 0.99

DC Load

Two homes have a loaded DC circuit. These are monitored, and are included in the net energy calculation.

AC Load

Everey home has an inverter and an AC circuit. Monitoring results are plotted below for each participant.

The energy consumed for the day is (kWh):

Fresno Laney Sequoias Berkeley Consumnes SantaClara SanJose Sacramento Chico
1.75 1.98 0.06 3.42 0.23 1.67 0.46 1.28 2.05

Net Energy for the time period (kWh_PV - kWh_load):

Fresno Laney Sequoias Berkeley Consumnes SantaClara SanJose Sacramento Chico
-1.16 -0.98 0.51 -2.21 0.28 -0.47 0.17 -0.39 -1.06

Room Temperature

A temperature logger was placed in each tiny home. One-minute logger data is shown in the plots below.

Room temperature inside the houses are aggregated to hourly and plotted below.

Room temperature throughout the day is summarised as follows:

T_Fresno T_Laney T_Sequoias T_Berkeley T_Consumnes T_SantaClara T_SanJose T_Sacramento T_Chico
min 72.4 71.1 69.6 74.0 69.8 73.0 67.7 70.8 71.9
mean 74.4 72.3 70.3 75.4 71.7 74.5 70.6 73.8 74.9
max 76.1 73.5 70.7 76.6 73.4 75.5 72.4 75.8 76.7

Refrigerator & Freezer

Thermocouples were routed from the refrigerator and freezer to a multi-channel logger. Note that the Fresno refrigerator thermocouple has been fixed. Scoring is determined from the following tabulations:

Fresno

max mean min
Refrigerator 54.2 49.6 47.1
Freezer 12.0 10.7 8.4
Room 77.4 75.6 73.4

Laney

max mean min
Refrigerator 42.5 37.5 36.0
Freezer 28.7 17.8 9.7
Room 74.4 73.2 72.4

Sequoias

max mean min
Refrigerator 60.3 57.5 54.4
Freezer 51.6 42.7 34.6
Room 70.7 70.4 69.8

Berkeley

max mean min
Refrigerator 1019.1 145.8 -698.1
Freezer 22.5 -219.9 -888.9
Room 1000.7 329.7 74.9

Consumnes

max mean min
Refrigerator 58.4 55.2 51.8
Freezer 60.9 57.2 51.9
Room 71.4 70.5 69.4

SantaClara

max mean min
Refrigerator 40.1 36.7 34.6
Freezer 10.4 2.3 -6.9
Room 76.6 74.9 73.8

SanJose

max mean min
Refrigerator 56.3 51.0 43.5
Freezer 50.5 36.5 8.4
Room 72.1 70.1 67.5

Sacramento

max mean min
Refrigerator 39.7 31.0 23.8
Freezer -5.5 -8.8 -12.4
Room 76.5 75.1 73.4

Chico

max mean min
Refrigerator 35.6 33.1 28.5
Freezer 15.0 1.5 -10.6
Room 78.4 76.3 74.3

In the figures below, the refrigerator and freezer temperatures are plotted for each participant, along with room temperature from an additional thermocouple. Temperature data is hourly-averaged to smooth out events like opening the refrigerator door.

Voltage Present

A monitor was installed to detect AC voltage on the house outlets. If power is lost for more than an hour, there is a point penalty. On these state loggers, a “1” indicates there is a voltage, and a “0” indicates it has been lost.