A shunt charge controller or shunt regulator diverts excess electricity to an auxiliary or "shunt" load, such as an electric water heater, when batteries are full.
Plain Language Summary
Simple charge controllers stop charging a battery when they exceed a set high voltage level, and re-enable charging when battery voltage drops back below that level. Pulse width modulation PWM and maximum power point tracker MPPT technologies are more electronically sophisticated, adjusting charging rates depending on the battery's level, to allow charging closer to its maximum capacity.
A charge controller with MPPT capability frees the system designer from closely matching available PV voltage to battery voltage. Considerable efficiency gains can be achieved, particularly when the PV array is located at some distance from the battery. By way of example, a volt PV array connected to an MPPT charge controller can be used to charge a 24 or 48 volt battery.
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Higher array voltage means lower array current, so the savings in wiring costs can more than pay for the controller. Charge controllers may also monitor battery temperature to prevent overheating. Some charge controller systems also display data, transmit data to remote displays, and data logging to track electric flow over time.
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It also contains important historical images that you may not have seen before". GRIN images are available in 4 resolutions, from about 80 pixels to about pixels wide. But whatever happened to the LM for cancelled Apollo 19 is unknown. This is almost 45, pages of presumably uncensored text, from both air to ground transmissions and onboard voice recorders. The original URL for this material went dead a couple years ago, but is now online at a new address.
Some of the books below are Adobe. If you would like to read NASA's.
Reflecting on 50 years of geoengineering research
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From: C. About this Item: Johns Hopkins Univ. Seller Inventory LHB Condition: Satisfaisant. While the glories and tragedies of the space shuttle make headlines and move the nation, the story of the shuttle forms an inseparabe part of a lesser-known but no less important drama-the search for a reusable single-stage-to-orbit rocket. Here an award-winning student of space science, Andrew J.
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Butrica, examines the long and tangled history of this ambitious concept, from it first glimmerings in the s, when technicians dismissed it as unfeasible, to its highly expensive heyday in the midst of the Cold War, when conservative-backed government programs struggled to produce an operational flight vehicle. Butrica finds a blending of far-sighted engineering and heavy-handed politics.
To the first and oldest idea-that of the reusable rocket-powered single-stage-to-orbit vehicle-planners who belonged to what President Eisenhower referred to as the military-industrial complex. Single Stage to Orbit traces the interplay of technology, corporate interest, and politics, a combination that well served the conservative space agenda and ultimately triumphed-not in the realization of inexpensive, reliable space transport-but in a vision of space militarization and commercialization that would appear settled United States policy in the early twenty-first century.
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Related Beyond The Ionosphere: Fifty Years of Satellite Communication (NASA History Series Book 4217)
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