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Solar Boost 2000e, 25A, 12V Solar Charge Controller

Solar Boost 2000e, 25A, 12V Solar Charge Controller
Solar Boost 2000e, 25A, 12V Solar Charge Controller
  Customer Reviews (5)
Item code Brand name Model number Amps
BLSSB2000E-12V Blue Sky Energy SB2000E 25A

SB2000E Solar Boost solar charge controller 25 amps, 12 volts out. Wall mount box NOT included.
Be sure to design and size your system correctly with Blue Sky's Module Selection Guidelines.

Blue Sky EnergyBlue Sky Energy
Solar Boost™ 2000E  
25 Amp Peak Power Tracking
Photovoltaic Charge Controller
Solar Boost 2000E


Solar Boost™ 2000E photovoltaic charge controller increases charge current up to 30% or more!

Increase your solar panel output up to 30% or more with this new photovoltaic charge controller.  Patent pending technology gives our 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's like having an extra panel but without the cost and weight.

  • Patented MPPT Technology Increases Charge Current Up To 30% Or More!
  • 25 amp capability supports large solar panel arrays
  • Multi-stage PWM Charge Control Improves Battery Performance and Life
  • Fully Automatic Electronic Current Limit Prevents Overload
  • Equalize Function Keeps Lead-Acid Batteries Operating At Their Peak
  • Durable Powder Coat Finish & Conformal Coated Electronics Resist Corrosion
  • Full reverse polarity protection
  • Selectable charge voltage charges flooded and gel type 12 volt lead acid batteries
  • Automatic temperature compensation available as an option
  • Charge Current Increase Can Save Money By Requiring Fewer Solar Panels
  • Full 36 Month Limited Warranty
  • Wall Mount Box must be purchased separately

SolarBoost charge controller solar boost charge controller

SolarBoost™ 2000 (SolarBoost 2000E's predecesor model) is discussed in the popular "Things That Work" feature in Home Power Magazine's October 1999 issue. The article concluded,

"This charge controller and current booster is an ideal match ofr PV systems. During times of lowest battery voltage, the current is boosted the most. This is when it is most needed in PV systems. If you need a charge controller for a PV array of 20 amps of less, the Solar Boost 2000 is a good choice. We are looking forward to testing Solar Boost 2000's big brother, the Solar Boost 50."

The Alternative Energy Store also offers another maximum power point tracking (MPPT) solar controller, the 50 Amp Solar Boost™ 50.

Increase your solar panel output up to 30% or more with our new photovoltaic charge controller. Patent pending technology gives our 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. At times it can be like having an extra panel but without the cost and weight.

How Does Solar Boost 2000E Increase Charge Current?

A photovoltaic (PV) array is a constant current type device. As shown on a typical PV panel voltage-current curve, current remains relatively constant over a wide range of voltage. A typical 75 watt panel is specified to deliver 4.45 amps @ 17 volts. Traditional PV controllers essentially connect the PV array directly to the battery when the battery is not at a high state of charge. When this 75 watt panel is connected directly to a battery charging at 12 volts, the PV panel still provides about the same current. But, because PV output voltage is lower, it can only deliver 53 watts to the battery. This wastes a whopping 22 watts of available power!

Solar Boost 2000E 's patent pending technology operates in a very different fashion. Under these conditions Solar Boost 2000E calculates the peak power voltage at which the PV panel delivers maximum power, in this case 17 volts. It then operates the PV panel at 17 volts to extract maximum power. Solar Boost 2000E continually recalculates the peak power voltage as operating conditions change. We call this peak power tracking. Input power from the peak power tracking controller, in this case 75 watts, feeds a power converter which reduces the 17 volt input to battery voltage at the output. The full 75 watts delivered at 12 volts would produce a current of 6.25 amps. A charge 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 example assumes 100% efficiency to illustrate the principal of operation. Actual boost will be less.

How Much Charge Current Increase Can I Expect?

The charge current increase you can expect is variable. Current increase varies with PV temperature and battery voltage. Lower PV temperature increases available power, while lower battery voltage increases current for a particular input power level. This means that the greatest current increase occurs when you need it most, in cold weather with a discharged battery!

What you can be sure of is that Solar Boost 2000E will deliver the highest charge current possible for a given set of operating conditions. When conditions are such that extra power is not available from the PV array, Solar Boost 2000E will operate as a high performance series pass PWM controller. Charge current increase field test results obtained using four 75 watt PV panels in southern California are shown in the table below. Your performance may vary due to a variety of factors.


Output current rating 25A
System voltage 12V nominal
Max PV Open Circuit Voltage 30VDC
Output current limit 25±0.5A
Voltmeter full scale range 19.99V
Voltmeter accuracy at panel terminals ± 0.10% full-scale
Current meter full scale range 30A
Current meter accuracy ± 0.75% full-scale
Standby current consumption 17mA typical
PV on current consumption 90mA typical
Output voltage adjustment range 13 - 16V typical
Power conversion efficiency 95% [email protected] 15A
Temperature compensation coefficient -30mV/°F (lead-acid)
  -20mV/°F (NiCd, 10 cell))
Panel dimensions 4.6"Hx6.4"Wx1.8"D

Examples of Typical Charge Current Increase
Output Voltage
PV Peak Power Current (Ip)
Output Charge Current
Percent Increase Relative to Ip
Operating Conditions And Ambient Temperature
Highly discharged battery
Ambient temperature 35°F,
clear still air @ 8:00am


Highly charged battery
Ambient temperature 46°F,
cloudy & breezy @ 2:45pm





Discharged battery
Ambient temperature 65°F,
clear still air @ 11:00am





Highly charged battery
Ambient temperature 75°F,
clear still air @ 1:00pm

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.



Blue Sky Energy

Technical Bulletins

SB 2000E Equalization
SB 2000E Relay Clicking
SolarBoost GFCI Use
SB High Temp Derating
SB Charge Voltage Set Tool
SB Sizing for High Input Voltage
SB Remote Display Signals

  • In the box: BLSSB2000E-12V

    In the box

Write a review

Dead Start capability


The 2000E is installed on a boat with 400 Ah of AGM golf cart batteries and a Norcold 8 cubit foot fridge drawing about 3.5 Amps at about a 20% duty cycle. The 2000E is fed by 3 65 Watt cells and produces over 11 amps at mid day.

Normally it operates perfectly with no attention. I desi...
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Solar Boost 2000E


I replaced the Morningstar SunSaver 10 Amp unit that I had used for about 1.5 years with the Solar Boost 2000E as a bit more current capability was needed under moderate discharge conditions on my Hunter 31 sailboat for my older 4 panel Siemens 55 W units.

The boost capability and exc...
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Works very well


Have in installed it on my sailboat. Installation was easy and it worked great. Average about a 20-22 percent increase in current output during peak winter daylight hours in SW florida. Gives me about .5-.7 amps extra per hour. Might be higher, but my solar panel is not orintated for best sun ang...
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Nice Product


I bought a 2000E, 12 volt charge controller in May of 2005, and I must say that I like it quite a bit.

I had one scare after a few months of use when the display went blank and it wasn't charging -- but this turned out to be my foolish use of undersized wiring from three of the sol...
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Installed very slick, one problem which a three minute call to Blue Sky Tech Support solved. If installing with a DC center (such as Outbacks') make sure the Neutral from the PV (or Combiner box) goes straight to the controller, not thru the DC Center Common neutral. Will not damage the unit,...
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View all reviews (5)

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