By Martin Streetly
Confound & wreck: a hundred crew and the Bomber aid crusade
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Extra info for Confound & Destroy: 100 Group and the Bomber Support Campaign
1 Standard Test Conditions and Measurements STC allow manufacturers and consumers to compare how different PV devices perform under the same conditions. A number of laboratories and centres test modules and cells for manufacturers. 5 *(Air mass indicates how much radiation is absorbed by the atmosphere). Note that modules and cells almost always produce less power under actual working conditions. The following measurements are normally taken at STC and recorded on the back of the module: • • • • Voltage at Pmax (Vmp) is the voltage at which the module produces the greatest power.
Batteries can be the same physical size, but have different capacities, as the example above shows – these are two AA sized rechargeable batteries, one with a capacity of 1200 mAh, the other 2500 mAh. Source: John Keane State of Charge (Soc) A battery’s SoC indicates the level of energy remaining within the battery. 6 shows how the SoC rises and falls as energy is put in and taken out of the battery. The voltage of a battery varies at different states of charge. 7 V, respectively, vary according to different SoC.
24 V (top). 73 V when the module is in the shade (bottom). Source: Frank Jackson module are connected in series and they each must carry the same current. When one cell (or more) is shaded, it stops producing current and instead consumes current, converting it to heat. Effect of Module Positioning on Output If a single cell is shaded for a long time, it may cause the entire module to fail. Even a single tree branch, a weed or a bird’s nest can shade one cell and cause electrical production to fall dramatically.