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  • Outback FM-60 MPPT Charge Controller

    The FLEXmax family of charge controllers is the latest innovation in Maximum Power Point Tracking (MPPT) charge controllers from OutBack Power Systems. Both continuous and active the innovative FLEXmax MPPT software algorithm allows this controller to increase your photovoltaic array power yield up to 30% as compared to non-MPPT controllers. Learn More

    SKU: TruPower-CContr-Outback-FM60A

  • Charge Controller

    Charge Controller: This is a solid state flexible series charge controller which features professional marine-grade components which are ready to attach to your flexible solar panel. The wires are rated for outdoor use and they are size 16 AWG with Hypalon Insulation. Learn More

    SKU: TruPower-CCont-Powerfilm-12V4A

  • 12V 4A Solar Charge Controller

    A good solid reliable Charge Controller is a key component of any solar battery charging system. Solar PV charge controllers allow you to use the uncertain voltage of a solar panel and condition it to safely charge lead acid batteries. The CT-XR4A is designed to be used in conjunction with our ThinFilm solar panel series or any other commercial grade solar panels. Learn More

    SKU: TruePower-CContr-12V4A

  • Xantrex C35 Charge Controller

    Xantrex Charge Controllers are well-known around the world as some of the best most reliable charge controllers for solar energy applications. The C Series is one of the best selling charge controller series on the market offering premium grade features at affordable prices. The C Series has an LED status light which displays both charging functions and battery charge status. Learn More

    SKU: TruePower-CContr-Xantrex-C35-12V24V-35A

  • Xantrex CM R100 Remote Digital Display

    The Xantrex CM R100 is an optional LCD digital display for C35 C40 and C60 charge controllers. The CM R100 connects directly to the controller and offers and enhanced display showing the volts amps and resettable cumulative amp hours for a solar array DC loads or diversion loads while the display can be placed up to 100 feet away from the controller itself. Learn More

    SKU: TruPower-CContrAcc-Xantrex-RemDisp-100

  • Sunlight 20A 12V Charge Controller

    The Sunlight 20 is also able to control both the solar panel and battery charging from the solar panel. It attaches directly to lighting fixtures to allow charging. The Sunlight 20 has the ability to control discharging and/or overcharging of the battery. It allows you to pick a time schedule with the time control dial. Learn More

    SKU: TruPower-LCContr-MorningstarSunlight-12V-20A

  • 6v charge/lighting controller v2

    A good Charge Controller is a must have item when you are using solar panels to charge lead acid batteries. The 6V Charge Controller from Silicon Solar takes the uncertain voltage generated by Solar Panels and conditions it to safely charge batteries without causing damage from overcharge. Learn More

    SKU: TruPower-CContr-6V500mA-v2

  • TruPower Charge Controller 12V30A

    The TruPower 12V 30A Solar Charge Regulator is designed to control the charging from the solar panel to the battery and then draw power from the battery to the outputs. The charge regulator has a lot of features that are not found on other solar charge controllers. It can handle charge or discharge from either a 12V battery or 24V battery. Learn More

    SKU: TruPower-CContr-12V30A

  • TruPower Charge Controller/Regulator 12V7A

    The TruPower 12V 7A Solar Charge Regulator is designed to control the charging from the solar panel to the battery and then draw power from the battery to the outputs. This keeps the whole solar system working properly. The TruePower 12V 7A is best used with “GridMaxx or TruPower” series solar panels. Learn More

    SKU: TruPower-CContr-12V7A

  • Zareba® 10 Mile Low Impedence Solar Powered Fence Charger

    Our 10 Mile Low Impedence Solar Powered Fence Charger can be used to control all livestock and nuisance animals. Use in moderate, dry weed conditions. Battery is included. Once battery is fully charged it can operate up to 2 weeks with no sun. Learn More

    SKU: SS-FenceCharger-10M

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Information Guide

Solar charge controllers are rated and sized by the solar panel array current and system voltage. Most common are 12, 24, and 48-volt controllers. Amperage ratings normally run from 1 amp to 60 amps, voltages from 6-60 volts.

For example, if one module in your 12-volt system produces 7.45 amps and two modules are utilized, your system will produce 14.9 amps of current at 12 volts. Because of light reflection and the edge of cloud effect, sporadically increased current levels are not uncommon. For this reason we increase the controller amperage by a minimum of 25% bringing our minimum controller amperage to 18.6. Looking through the products we find a 20-amp controller, as close a match as possible. There is no problem going with a 30-amp or larger controller, other than the additional cost. If you think the system may increase in size, additional amperage capacity at this time should be considered.

MPPT Charge Controllers:

Outback Power’s MX60, an MPPT Charge Controller
Traditionally, you would assume that the nominal voltage of your battery and your solar panel array would be the same and that you would also choose that voltage for your charge controller. However, in recent years, a more efficient charging technology called Maximum Power Point Tracking (MPPT) has become available on some models of charge controllers. One of the interesting features of this technology is that it usually allows you to have a solar panel array with a much higher voltage than your battery bank’s voltage. The MPPT charge controller will automatically and efficiently convert the higher voltage down to the lower voltage.

MPPT Charge Controllers Save You Money on Wiring Costs:

A big advantage to having a higher voltage solar panel array is that you can use smaller gauge wiring to the charge controller. And since a solar panel array can sometimes be over a 100 feet away from the charge controller, keeping the cost of the wiring down to a minimum is usually an important financial goal for the whole project. When you double the voltage (e.g. from 12 to 24 volts), you will decrease the current going through the wires by half which means you use a quarter as much copper (or cable with half of the diameter). See our wire sizing seminar for more information.

So, for instance, you could have a 1000 watt solar panel array that operates at 48 volts DC and your battery bank is 24 volts DC. MPPT charge controller are rated by the output amperage that they can handle, not the input current from the solar panel array. To determine the output current that the charge controller will have to handle we use the very basic formula for power (watts), which is:

Power = Volts x Amps

Here we know the power is 1000 watts, the battery bank is 24 volts, so:

1000 watts = 24 volts x Amps

which gives us:

Amps = 1000 watts/ 24 volts

Amps = 41.7A

We still want to boost this value by 25% to take into account special conditions that could occur causing the solar panel array to produce more power than it is normally rated for (e.g. due to sunlight’s reflection off of snow, water, extraordinarily bright conditions, etc). So, 41.7A increased by 25% is 52.1A. In this case we’d probably choose a 60 Amp MPPT Charge Controller, like Outback Power’s MX60.

Another Benefit of MPPT Charge Controllers:

Because MPPT charge controllers can handle a different (but higher) input voltage from the solar panel array than the battery bank’s voltage, you can also use these charge controllers with solar panels that have odd voltages that don’t match any typical system voltage (i.e. 12, 24 or 48V). For instance, you could have a solar panel that has a nominal voltage of 57 volts and charge and battery bank that’s 24 volts efficiently with an MPPT charge controller.

Be aware that MPPT charge controllers have an upper voltage limit that they can handle from the solar panel array. It’s important that you make sure than there is no condition that the solar panel array voltage will go above this limit or you could potentially burn out the controller. You want to make sure that the open circuit voltage of the solar panel array does not go above this limit. You also want to give yourself a little bit of a margin for an error to take in account the possibility that a solar panel array’s voltage will actually increase the colder it gets. If you give yourself a 10% margin of error you should be fine.

Here’s an example:

We’ll use four 12 volt Evergreen 102 Watt solar panels all run in series for a nominal voltage of 48 volts and our battery bank is at 12 volts. We’d like to use BZ Product’s MPPT500 charge controller. If we look at the panel’s specification page we see that each panel has an open circuit voltage of 21.3V. That means the array has four times that (because there are 4 panels in series). So the array open circuit voltage is 21.3V x 4 = 85.2V. We’ll boost this up by 10% for safety and we get 93.7V. Now we’ll look at the MPPT500′s specifications and we see that it can take a maximum of 100 volts. So we’re ok!

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Shop a selection of Solar Power Charge Controllers and other renewable energy products at Silicon Solar.
Bainbridge, NY Office
Integrated Products Division
Silicon Solar
2917 State Hwy 7
Bainbridge, NY 13733
P: 1.800.786.0329
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Silicon Solar
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San Diego, CA 92107
P: 1.800.786.0329
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