Blue Sky MPPT Solar Charge Controllers
Increase your solar panel output up to 30% with a MPPT photovoltaic charge controller. Patent pending technology gives this charge controller the capability to use all the power your panels are capable of putting out. You could actually consider using less panels! When your batteries are low and you have sun, you will get maximum power out of your panels. Under boost conditions it is like having an extra solar panel, but without the cost and the extra weight.
Models from 15 to 50A Capacity are available.
Maximum Power Point Tracking (MPPT) extracts the maximum amount of available power from a photovoltaic (PV) array. A battery-based PV system normally only harvests about 65% to 95% of the power available from the PV array. By using an MPPT-type charge controller almost all of this previously un-harvested power is made available for charging the battery bank.
Solar Boost controllers are significantly oversized, thus reducing the stress on the components and greatly increasing reliability. When the controller is at full output power, the FET's (main power transistors) and other power related components are designed to operate at less than 50% of the maximum design values for the components. In fact, the FET's in the SB50 are capable of handling up to 74 amps each but RV Power Products chooses to operate them at a maximum of 12.5 amps each!
Patented Maximum Power Point Tracking (MPPT) technology allows Solar Boost products to increase charge current up to 30% or more compared to conventional charge controllers.
The SB50 and SB3048 are designed to electronically limit the maximum output current to their rated values; 50 amps for the SB50, 30 amps for the SB3048. These units automatically reduce the amount of power they extract from the solar array to insure current limits are not exceeded. The SB controllers do not require the 130% to 156% de-rating. RV Power Products recommends limiting the rated output current of the array (Imp) to about 73% of the rated output of the controller.
RV Power Products designed their MPPT circuit around an interesting characteristic of PV modules. The voltage differential between the Open Circuit Voltage (Voc) and Maximum Power Point Voltage (Vmp) stays relatively constant over the temperature range PV modules typical experience. As the module gets hotter both the Voc and the Vmp are reduced at the same rate and the voltage differential between them remains relatively constant. This allows the SB controller to track the actual Vmp at any module temperature simply by momentarily testing the Voc of the array and then operating the array at the Voc minus the voltage differential.
An optional digital display is available that displays Battery Voltage, Solar Panel Current and Output Charge Current. The SB controllers allow for both an optional front panel mounted display and/or remote display. Both displays can be installed on the same controller. These displays provide very accurate readings, unlike displays on some other popular controllers, and are very popular with the end user because they can see actual boost in charging amps moment to moment.
Applying the proper charge voltage is critical for achieving optimum battery performance and longevity. The ideal charge voltage required by batteries changes with battery temperature. The battery temperature sensor allows the charge controller to continuously adjust charge voltage based on actual battery temperature. Temperature compensation of charge voltage assures that the battery receives the proper charge voltage as battery temperature changes during normal operation.
With out temperature compensation charge voltage could be too low at low battery temperatures leading to chronic under charging and battery damage due to Sulphation. At high battery temperatures charge voltage would be too high leading to excessive water loss and undue degradation of the positive plate. Both of these conditions can impair battery performance and shorten battery life.
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