Morningstar SunGuard SG-4 Charge Controller, 12V

SG-4

New product

$30.00

- +

 
Product information

The SunGuard charge controller from Morningstar uses the same charging circuit as the SunSaver. It is ideal where a 12-volt, low-power controller is needed. It can control up to 75 watts of PV module(s). Since it is epoxy encapsulated, it can be used outdoors in a harsh environment. The controller has wire leads for connecting module and battery. 5-year warranty.

 
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Morningstar SunGuard

Morningstar SunGuard charge controller spec sheet (English)

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Morningstar Catalog (EN)

Morningstar Product Catalog (English)

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Morningstar Catalog (ES)

Morningstar Product Catalog (Spanish)

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Sizing guide

Quick guide for selecting the right charge controller

Each time you charge deep cycle batteries with solar panels, it's necessary to use a charge controller in the circuit to protect the battery from over charging, and in some instances from over discharging. The only exception is when using solar panels smaller than 5W. Choosing the most suitable charge controller is simple and only requires two steps:

Step 1 - Voltage selection
Select a charge controller that is compatible with the system voltage. The standard configurations are 12, 24, and 48 volts. If you are wiring your batteries for 24 volts you need a charge controller that is rated at 24 volts.

Some controllers are voltage specific, meaning that the voltage cannot be changed or substituted. Other more sophisticated controllers include a voltage auto-detect feature, which allows it to be used with different voltage settings.

Step 2 - Current capacity

Select a charge controller that can handle the maximum output current of the solar panel (or solar array). The maximum possible current that a PV panel can generate is the “short circuit current,” indicated as Isc in the panel’s label or specs sheet.

It’s recommended to include a safety factor for isolated events as well. For example, a solar panel with a Isc of 7.89 amp could potentially produce an extra 25% on a sunny day with very clear snow pack. (additional light reflected off the snow). This results in a possible maximum of 9.86 amp (7.89 x 1.25 = 9.86 amp). In this case, a 10 amp charge controller would be recommended.

Below you will find a quick guide to choosing the proper charge controller for several popular solar panel sizes.

12V olar panels 5W - 45W
Phocos CM 04 Charge Controller 4A, 12V

12V solar panels up to 70W
Flexcharge PV7D Charge Controller 7A - 12V

12V solar panels up to 120W
Phocos CM 10 Charge Controller 10A, 12V
Phocos CMLup 10 Charge Controller 12/24V, 10A
Phocos ECO 10 Charge Controller 10A, 12V
Phocos ECO-N-10-T Charge Controller 10A, 12/24V

12V solar panels up to 160W
Flexcharge NC25A Charge Controller 25A – 12V
Phocos CMLup 20 Charge Controller 12/24V, 20A
Phocos ECO-N-20-T Charge Controller 10A, 12/24V

12V solar panels up to 160W
Flexcharge NC25A Charge Controller 25A – 24V
Phocos CMLup 10 Charge Controller 12/24V, 10A
Phocos ECO-N-10-T Charge Controller 10A, 12/24V

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