Field Notes
<--2001-12-06 08:00:00 | 2001-12-19 12:30:00-->Tonzi/Vaira: 2001-12-07 09:00:00 (DOY 341)
Author: Dennis Baldocchi
Others:
Summary: Removed 4 of 6 new batteries to fix charging issues.
| 7 Dec01 Vaira Solar fence battery volts = 11.99 volts Change PVM angle to 30 degree from vertical Remove 6 old batteries Install 2 new batteries, cables and anticorrosion compound V reg= 13.7 PVM current = 8.7 - 9.6 noon sun with high thin wispy clouds load current = 2.2 Tonzi Floor V reg = 13.7 PVM current = 8.0 noon sun with high thin wispy clouds load current = 2.2 Remove 4 of 6 of new batteries so only 2 are being used Note: Dennis and I discussed placing 6 new batteries at each of the sites. I installed 6 new batteries at Tonzi floor on Thursday and shortly afterwards I realized that our flux platforms were running fine during the day when power is available but failed to operate overnight. This is so because the 6 PVMs deliver current that varies between 2 and 15 amp over the diurnal cycle. The flux platform uses 3 amp and the remaining current (0 to 12 amp) is used to charge batteries. If (big if) we got the full 12 amp of charge current over the diurnal cycle it would take 50 hours to charge the 6 - 100 amp-hour batteries (600 amp-hour/12 amp = 50 hours). Trying to charge 6 - 100 amp-hour batteries will not work well since we do not get 50 hours of sunlight in a diurnal cycle! By cutting the battery capacities from 600 to 200 amp-hour the time to charge with 12 amp will be 16 hours, much more easily achievable. Anyway, the floor and vaira systems now have only 2 - 100 amp-hour batteries and the tower system has 4. We will be able to analyze their performance and determine which functions better over the next week or 2 and make necessary modifications. I would not be surprised if we have to go to only 1 - 100 amp-hour battery at each site so we fully charge the battery daily -- even on cloudy days which would be ideal for continuous data capture. |
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