Equipment and Calibration History

History for Fabricated BB-Fab BB-TA

Rec No.	Date	Loc From	Title	Loc To	Notes
3479	2018-06-05	Twitchell Alfalfa	Removed	Vaira	The site was shut down and the battery bank with action packer was removed for use at Vaira soil co2.
3352	2018-03-07	Twitchell Alfalfa	Maintenance	Twitchell Alfalfa	The battery bank at TA was rewired from to pairs (24V) to four in parallel (12V).
2227	2016-04-01	Twitchell Alfalfa	Upgrade	Twitchell Alfalfa	I put the battery bank in a new battery box, a Rubbermaid 35-gallon Action Packer. The four batteries fit with room to spare.
2057	2015-11-11	Twitchell Alfalfa	Upgrade	Twitchell Alfalfa	All four batteries were swapped out. Four new 27DCMJ batteries were installed. Two of the old batteries had Jan 2012 stickers and may not be in such bad shape.
2056	2015-10-20	Twitchell Alfalfa	Notes	Twitchell Alfalfa	The tower started losing power regularly over night. Time to swap out the batteries.
2055	2015-09-15	Twitchell Alfalfa	Notes	Twitchell Alfalfa	The batteries have started to have problems supplying 12V from the 6400.
2054	2014-09-04	Twitchell Alfalfa	Upgrade	Twitchell Alfalfa	A line was added to one of the external batteries to pull 12V off for the 6400.
2053	2014-08-15	Twitchell Alfalfa	Upgrade	Twitchell Alfalfa	The older external third battery was removed. The original two batteries were rewired into series and the other two isolated batteries were integrated. The system is now two pairs of batteries for a 24V system.
2052	2014-08-13	Twitchell Alfalfa	Upgrade	Twitchell Alfalfa	Two batteries for the soil CO2 system were brought over from Sherman. These two batteries are in series for 24V and are isolated for the time being from the solar system.
2051	2013-11-25	Twitchell Alfalfa	Upgrade	Twitchell Alfalfa	A third older battery was added in parallel outside the wooden box due to low voltage power outages.
2050	2013-06-05	Twitchell Alfalfa	Upgrade	Twitchell Alfalfa	The batteries were moved into an insulated wooden box.
2049	2013-05-24	Lab none	Installed	Twitchell Alfalfa	Two Flooded Lead Acid (FLA) batteries model 27DCMJ deep cycle batteries with Jan 2012 stickers were installed in parallel for a 12VDC battery bank. The batteries are in then open.