1. Sunrise to Sunset Data Zent and Gerald Open Circuit Voltage Setup Current Logging Setup Jan 12 Rainy Day Voltage Data Jan 15 Sunny Day Voltage Data Jan 21 Current Data Some Conclusions On the Side... (Max II Data Logger Accuracy) (Max II Data Logger Accuracy)

2. Voltage Logging Set Up Solar Cell Connected to a 10 M ohm DMM Notes: Data set 1 collected January 12 06:52 am to 6:13 pm... Data set 2 collected January 15 06:03 am to 06:01 pm... Sunrise was around 06:00 am... Sunset was around 06:00 pm...

3. Current Logging Set Up Solar Cell Connected to a 1.7 ohm load HP Logger Paralleled to a “sense resistor” to divide current

4. Jan 12 Rainy Day Data

6. Jan 15 Sunny Day Data

7. Jan 21 Current Data Sunny weather from 0600 to 1100... Cloudy/ rainy weather from 1100 to 1420... Cloudy weather from 1420 to 1600... Sunny weather from 1600 onwards...

8. Some Conclusions Voc is at its peak from 06:48 am to 5:33 pm Voc is at its peak from 06:48 am to 5:33 pm At this time, Voc sweeps from 35 V to 45 V At this time, Voc sweeps from 35 V to 45 V Despite raining the whole day on Jan 12, the Voc seemed to be in the same level for similar times on the sunny Jan 15. Despite raining the whole day on Jan 12, the Voc seemed to be in the same level for similar times on the sunny Jan 15. Irradiance highly affects current ratings as expected... Irradiance highly affects current ratings as expected... current ratings radically changes during a day. current ratings radically changes during a day.

9. Max II Voltage Logger Updates Accuracy Test Accuracy Test 249 data points were collected (roughly 2 hours)... 249 data points were collected (roughly 2 hours)... 3 random points were measured with a 3 random points were measured with a DMM and matched with the logger... Point 1 had a % error of 9% Point 1 had a % error of 9% Point 2 had a % error of 2% Point 2 had a % error of 2% Point 3 had a % error of 1.4 % Point 3 had a % error of 1.4 % More accuracy tests needed More accuracy tests needed Error comes from... Error comes from... decaying reference voltage decaying reference voltage This can be solved by an IC Regulator? This can be solved by an IC Regulator? Temperature sensitive voltage divider Temperature sensitive voltage divider This can be solved using temperature This can be solved using temperature insensitive resistors Sir Tris helped with the ff: Sir Tris helped with the ff: Over voltage protection implemented Over voltage protection implemented Divider circuit derivation conceptualized Divider circuit derivation conceptualized but not yet implemented I have to make sure that the big cell I have to make sure that the big cell will see the computed resistances as open circuit