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Solar Boost 3048DL
MPPT Charge Controller
(Also see Other Options)
Solar Boost 3048DL is a24/48 volt photovoltaic (PV) charge controller capable of delivering up to 30 amps of output current. Patented* Maximum Power Point Tracking (MPPT) technology allows Solar Boost 50 & 3048 to increase charge current up to 30% or more compared to conven- tional charge controllers. Controllers without MPPT technology simply can't deliver the charge current provided by Solar Boost 3048. Don't waste money by throwing PV power away! Get the power you paid for with the Solar Boost 3048.
Solar Boost 3048 does much more than increase charge current. It offers an advanced fully automatic three stage charge control system to ensure the battery is properly and fully charged, resulting in enhanced battery performance with less battery maintenance. Reliable high efficiency power conversion is achieved using the latest generation power MOSFET transistors, with output power delivered via a series pass Pulse Width Modulation (PWM) control scheme. An electronic current limit feature prevents output current from exceeding 30 amps. Output current limit eliminates worry about overload or nuisance fuse blow when PV power production is unexpectedly high. An equalize function is also included to periodically condition liquid electrolyte lead-acid batteries. An optional user friendly digital display is available to monitor PV charge performance. The display shows battery voltage, solar panel current, output charge current, charge mode and state of charge. It can be provided in the controller as pictured above, as a remote panel installed up to 300 feet away, or both. Optional temperature compensation of charge voltage is also available for both lead-acid and NiCd batteries to further improve charge control and battery performance.
A solar module is a constant current device. As shown on a typical voltage-current curve, current remains rela- tively constant over a wide range of voltage. A typical 75 watt module delivers 4.45 amps @ 17 volts. Conventional controllers connect the module directly to the battery when the battery is discharged. When this 75 watt module is connected to a battery charging at 12 volts, the module still provides about the same current. But, because module output voltage is now held lower by the battery, it can only deliver 53 watts of power. This wastes a whopping 22 watts or nearly 30% of the available power!
Solar Boost's patented MPPT technology operates in a very different fashion. Under these conditions the Solar Boost calculates the maximum power voltage at which the module can deliver its maximum available power, in this case 17 volts. It then operates the module at 17 volts to extract maximum power. Solar Boost 3048 continually recalculates the maximum power voltage as operating conditions change. Solar module power, now 75 watts, feeds a high efficiency power converter which reduces the 17 volt input to battery voltage at the output. The full 75 watts delivered at 12 volts would produce 6.25 amps. A current increase of 1.8 amps or 40% is achieved by converting the 22 watts that would have been wasted into useable charge current. This 12 volt example assumes 100% efficiency to illustrate the principal of operation. Actual boost will be somewhat less as some power is lost in wiring, fuses, and in the Solar Boost 3048 controller.
The actual charge current increase you will receive varies with module temperature and battery voltage. Lower module temperature increases available power, while lower battery voltage increases current for a solar output power level. Under normal conditions in comfort- able temperatures, current increase typically varies between 10 to 25%, with 30% or more easily achieved with a discharged battery and cooler temperatures. What you can be sure of is that Solar Boost 3048 will deliver the highest charge current possible for a given set of operating conditions. In conditions where extra solar power is not available, Solar Boost 3048 will operate as a conventional series pass PWM controller.
Three Stage Charging Taken To The Next Level*
Controllers that determine full charge based on time or other arbitrary factors cannot realize all the benefits three stage charging has to offer. The proper indication of when a lead-acid battery is fully charged is when net battery charge current during acceptance charge decreases to 1.0 amps per 100 amp-hours of battery capacity. Solar Boost 3048 uses net battery charge current optimized to battery size in amp-hours to determine full charge. This method charges the battery quickly and completely without undercharge, overcharge or excessive water loss. An internal precision alloy shunt is used to measure battery current when battery load during charge is relatively constant. When battery load is highly variable during charge, Solar Boost 3048 can connect to an external shunt measuring net battery current. If desired, Solar Boost 3048 can also operate as a two stage charger.
*Note:3 stage charging requires the Temperature Sensor Lug!
Note: For optimal Maximum Power Point Tracking performance, it is recommended that MPPT charge controllers be used in conjunction with uniform solar arrays consisting of multiple, identical solar panels. MPPT charge controllers will still work with mixed arrays, but at reduced efficiencies, which defeats the whole point of MPPT technology. These devices were designed to calculate the most efficient charging characteristics given the assumption of a uniform array. Mixed arrays, by definition throw this calculation off.
SB50-3048 Powerboard Replacement
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