Phocos ECO-N-20-T Charge Controller 20A, 12/24V


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Product information

The new Phocos ECO-N-20-T (20A) is a small, sleek, efficient charge controller specifically designed for smaller PV systems that require low battery disconnect. They feature a simple, easy to use design that integrates a three LED display that allows the monitoring of the system's progress, battery SOC and system load status.

The ECO-N-T controllers are fully encapsulated with a IP68 casing made to handle harsh environments. They are negative grounded and can operate in 12V and 24V systems (auto-detection). This is one of the few fully encapsulated charge controllers featuring screw terminals.

The ECO-N-T charge controllers have three electronically regulated charging modes; boost, main and float. These charge controllers are engineered for electronic protection against panel surge voltage, wrong polarity of panels or batteries, system overload, and short circuit. Despite it's size and simple design, the ECO-N-T controllers are adaptable to weather and temperature changes with an integrated temperature compensation. They also include deep discharge protection, as well as IP68 protection, meaning it has the highest ratings to withstand dust or dirt particles, pressure and even water submersion.

Phocos ECO-N-20-T technical specifications:
System voltage: 12V, 24V
Maximum current: 20A
Grounding: Negative ground
Battery type compatibility: Lead acid (GEL, AGM, Flooded)
Max. wire cross section: 8AWG (10mm)
Dimensions (WxHxD): 3.94 x 2.4 x 0.79 in (100 x 61 x 20 mm)
Weight: 5.6oz (160g)
Protection: IP68 (casing), IP21 (contacts)

Recommended use
The ECO-N-20-T can operate interchangeably with 12V and 24V solar panels. The 20A will allow you to connect one or multiple panels up to 240W. Keep in mind that this is not an MPPT controller and the panels used have to be 12V or 24V nominal, this controller will not work with high voltage modules commonly used in residential applications. The electronics are entirely encapsulated and feature screw terminals for easy installation, it is an ideal controller for systems with exposure to the elements. For environments with extreme corrosion we recommend the ECO 10 (only 12V) which is fully encapsulated and has no moving parts. The ECO-N-20-T features a 20A Low Voltage Disconnect (LVD) to prevent the batteries from over discharging. An alternative in this range would be the CMLup20, however is not encapsulated and recommended for indoor use only. The CMLsolid30 is an encapsulated controller with 30A capacity for larger systems. 

About Phocos
Phocos was founded in Germany in the 1980’s. The original founders were engineers and researchers who studied renewable energy at the Ulm University of Applied Sciences. They mainly focused on off-grid applications, for use in remote areas with no connection to the electric grid. As the demand for renewable energy sources grew in remote areas, so did their range of innovations. Phocos maintains a priority to develop eco-friendly, simple to use, energy saving products that are also durable with high-end technology. Applications of their products range from rural, recreational, residential, to industrial. Phocos North America is located in Tucson, AZ. Phocos also has 12 other offices around the world.

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Phocos ECO-N-T Controller

Specifications for Phocos ECO-N-T 10 Charge Controller

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Other Phocos PMW controllers

CM 04 and CM 10
The CM 04 and the CM 10 are the smallest and most inexpensive charge controller Phocos offers. They are ideal for small systems that do not require Low Voltage Disconnect (LVD).
Main feature: Does not include Low Voltage Disconnect (LVD)
PV capacity CM 04: up to 45W
PV capacity CM 10: up to 120W
Available voltage: 12V
Low Voltage Disconnect: No
Rating: Indoor

ECO 10
The ECO 10 is small and versatile, it is fully encapsulated and the connections are made via the provided wires. It does not have any moving parts and it is the best option for small systems (up to 120W) exposed to rough or corrosive environments.
Main feature: Fully encapsulated, no moving parts
PV capacity: up to 120W
Available voltage: 12V
Low Voltage Disconnect: Yes
Rating: Encapsulated for though environments

CMLup10 and CMLup20
The CMLup controllers are modern and lightweight. They are a convenient solution for small systems when the controller is in a dry and friendly environment. They feature a USB port for easy charging of portable electronics.
Main feature: Best option for indoor use, USB charging port
PV capacity CMLup10: up to 120W
PV capacity CMLup20: up to 240W
Available voltage: 12V, 24V with auto select
Low Voltage Disconnect: Yes
Rating: Indoor use

ECO-N-10-T and ECO-N-20-T
Indisputable a great controller for humid, dusty or corrosive environments. As the ECO 10 unit, the electronics in the ECO-N-T units are fully potted and cased in an aluminum cover, the main difference is that they come with terminals instead of wires to facilitate a secure connection.
Main feature: Excellent for humid, dusty or corrosive environments.
PV capacity ECO-N-10-T: up to 120W
PV capacity ECO-N-20-T: up to 240W
Available voltage: 12V, 24V with auto select
Low Voltage Disconnect: Yes
Rating: Encapsulated, corrosion resistant

Besides the front display, the first thing you will notice about the Dingo D2020N is the wide range of operating voltages 12V, 24V, 32V, 36V and 48V it provides out of the box. It is fully programmable and works with wind and micro-hydro power sources.
Main feature: Display and 5 fully programmable voltage set points
PV capacity: up to 240W (wind and hydro compatible)
Available voltage: 12V, 24V, 32V, 36V, 48V
Low Voltage Disconnect: Yes
Rating: Indoor use

The CMLsolid30 is the largest Phocos PMW controller, suitable for medium 12/24V PV arrays up to 360W. Provides 30A of charging capacity and LVD. It is compact and features a heat dissipator in the back. It has full electronic protection and is cased in a flashy orange aluminum cover. It also features a USB for charging small electronics.
Main feature: Compact size with 30A of charging capacity.
PV capacity: up to 360W
Available voltage: 12V, 24V with auto select
Low Voltage Disconnect: Yes
Rating: Protected electronics

CIS-N-10 and CIS-N-20
The CIS-N controllers are known for their built-in load timer. They are commonly used in solar lighting applications. They are fully encapsulated in an aluminum case and does not have any moving parts. It is suitable for 12V and 24V systems and it comes in 10A and 20A. Some CIS models can control two independent loads. Don’t judge it by it’s size, the CIS-N controller is loaded with features.
Main feature: Built-in timer for one or two independent loads.
PV capacity CIS-N-10: up to 120W
PV capacity CIS-N-20: up to 240W
Available voltage: 12V, 24V with auto select
Low Voltage Disconnect: Yes
Rating: Encapsulated, corrosion resistant

CIS-N-LED 350/600/700/1050/1400/2800mA
The CIS-N-LED controller includes all the great features found in the legendary CIS-N but it was designed specifically to operate with LED lights. The appearance and specs of the controllers are very similar, however, the CIS-N-LED features a LED driver and a light dimmer.
Main feature: Built-in driver for LED lights
PV capacity CIS-N-LED 350/600/700mA: up to 120W
PV capacity CIS-N-LED 1050/1400/2800mA: up to 240W
Available voltage: 12V, 24V with auto select
Low Voltage Disconnect: Yes
Rating: Encapsulated, corrosion resistant

Summary Table

ModelVoltageCurrentMax PV capacityLVDRating
CM 0412V4A45WNoIndoor
CM 1012V10A120WNoIndoor
ECO 1012V10A120WYesEncapsulated
Dingo D2020N12/24/32/36/48V20A240WYesIndoor
CIS-N-LED 350/600/700mA12/24V10A120WYesEncapsulated
CIS-N-LED 1050/1400/2800mA12/24V20A240WYesEncapsulated
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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