1. Introduction
The MidNite Solar CLASSIC 200-SL MPPT Charge Controller is a simplified SOLAR ONLY version of the Classic 200, featuring streamlined menus. This charge controller includes a graphics panel and ground fault protection but does not have arc fault or Ethernet capabilities. It offers a maximum output current of 79 amps, operates at 200 volts, and is compatible with 12 to 72 volt battery systems. The CLASSIC 200-SL incorporates MidNite's exclusive HyperVOC technology, which extends VOC limits when necessary. Its streamlined menu design facilitates easy setup and installation for solar-only applications.
Key features include:
- 2 Aux Ports
- Follow-Me function
- Built-in DC-GFP (Ground Fault Protection)
- Optional Battery Sensor for temperature correction on battery charging
Image 1: Front view of the MidNite Solar CLASSIC 200-SL MPPT Charge Controller, showing the display and control buttons.
2. Setup and Installation
2.1 Removing and Installing the Front Cover
To access the wiring compartment, the front art deco cover of the Classic must be removed. Exercise caution as this cover is connected to the electronics via a cable. Avoid pulling hard or fast to prevent damage.
For installation, remove the 4 Phillips head screws with a #2 Phillips screwdriver. Lift the front half of the Classic casting off. Unplug the display cable, which functions similarly to a phone cable.
When reinstalling the cover, apply a small amount of Silicone grease (included in the parts bag) onto the metal pins of the male jacks on the Display cable before plugging them in. To re-install the front cover, plug in the display cable and carefully route it around the components on the circuit board to properly seat the cover. Do not force the cover if it does not seat into place easily; check for any cables or wires that may be interfering. Once seated, install the four Phillips screws with a #2 Phillips screwdriver.
Image 2: Internal view of the Classic charge controller with the front cover removed, showing the display cable connection and circuit board.
2.2 Mounting the Classic
The following section covers typical mounting arrangements. For additional details, contact technical support. The Classic is designed for direct mounting onto the MidNite Solar E-Panel. Mount the unit in an upright position out of direct sunlight when possible. For convenience, the Classic has four one-inch knock-outs that are pre-cast. The Classic has mounting locations and control locations similar to other brands of charge controllers, facilitating upgrades.
Mounting the Classic directly to the E-Panel:
- Remove the front cover of the Classic.
- Install the mounting bracket on the E-Panel and start the upper mounting screw into the bracket, leaving it about half way out so you can hang the Classic on this screw.
- Install the 1 inch close nipple into the E-Panel as shown in the E-Panel directions. The 1" close nipple, 3 locknuts and 2 plastic bushings are included with each E-Panel. One locknut acts as a spacer.
- Carefully hang the Classic on the screw in the bracket and slide it over the close nipple (see Image 4).
- Install the lock nut and bushing on the close nipple and tighten the screw in the mounting bracket.
- Do not install the front cover until you complete the wiring of the Classic.
Image 3: Charge controller bracket for E-Panel mounting.
Image 4: Classic mounted to the side of a MidNite Solar E-Panel.
Image 5: Nipple, locknuts, and bushings included for E-Panel mounting.
IMPORTANT! Do not mount in a zero clearance compartment. Overheating may result. The Classic produces heat in normal operation. Airflow around the Classic is required to prevent overheating and shutdown. This is especially true in hot environments.
2.3 Alternative Mounting
To mount the Classic to a plywood surface, use 1 1/2" wood screws in the top key hole slot and the holes in the wiring compartment. Ensure the Classic is plumb and level.
Image 6: Installation of a locknut to act as a spacer during mounting.
3. Features
3.1 HyperVOC Technology
HyperVOC is a feature designed to extend the Voltage Open Circuit (VOC) limits of the charge controller, particularly beneficial in cold weather conditions. Solar panels can output higher voltages in cold weather. The National Electrical Code (NEC) requires multiplying the VOC of your solar panel by a correction factor based on your coldest conditions. For example, if the correction factor is 1.23, and you have 3 panels in series with a VOC of 43.3V each, the total VOC would be 43.3V x 3 x 1.23 = 159.6V. On a standard 150V controller, this would exceed the limit.
The MidNite Solar controller provides headroom for cold mornings that would otherwise damage other controllers. This unique characteristic allows it to operate safely beyond the maximum operating voltage for these conditions, a feature called HyperVOC.
Do not misuse the HyperVOC function. For instance, with a 150V Classic configured with 4 modules in series, where each has a VOC of 36.9V, the maximum VOC will reach 181.54V in Alberta with a -32°C temperature on a 48V battery bank.
Image 7: Detailed explanation of HyperVOC technology and its benefits in cold weather.
Image 8: Graph showing PV voltage and output current behavior, including the non-operative HyperVOC zone and wake-up phase.
3.2 DC-GFP (Ground Fault Protection)
The Classic includes internal ground fault protection (GFP) as a built-in feature. Since 2008, the NEC mandates DC-GFP on all PV systems in the USA. The integrated DC-GFP eliminates the need to purchase and install an external DC-GFP. If the internal grounding jumper is installed in a Classic, the battery negative and DC source negative must not be connected to the system ground conductor anywhere in the system. Grounding these circuits will defeat the GFP function. In a network with multiple Classics connected in Follow Me mode, only one Classic should have its internal grounding jumper installed, and all should have GFP enabled. The factory setting configures a DC negative to System Ground connection in the Classic charge controller. The GFP function needs to be disabled for Positive ground or an ungrounded DC system.
The Ground Fault Protection device is designed for simplicity and ease of understanding. It detects a fault between the battery/PV negative and earth ground, similar to a breaker DC-GFP system. The key difference with the Classic is that it turns off the charge ability and emits a loud warning when a ground fault is detected. The Classic's system consists of a PTC (Positive Temperature Coefficient) that is located between the Negative and Ground internally. This PTC is a self-healing fuse that opens when current exceeds its rating and recloses when current drops below its rating. The Classic monitors this PTC and disables charging if it senses an open circuit. Once the fault is cleared, the Classic will restore charging.
To disable the internal Ground Fault Protection function, the jumper labeled GFP needs to be removed. The GFP function must then be disabled in the TWEAKS menu. Refer to the "Disabling GFP" instructions in the full manual.
To reset the internal GFP function after a detection has occurred: first, clear the actual ground fault, then turn OFF the Classic and turn it back ON. This is achieved by turning the external battery breaker to the OFF position and then to the ON position.
Image 9: Internal view highlighting the GFP jumper for ground fault protection.
4. Specifications
- Operating Voltage: 200 Volts
- Maximum Current Output: 79 amps
- Battery System Voltage: 12-72V
- Environmental Rating: Type 1
- Terminal Rating: 75°C
- Display Type: Graphics Panel
- Item Weight: 11.38 pounds
- Package Dimensions: 18.9 x 8.8 x 6.1 inches
- Certifications: ETL listed to UL1741 and CSA, CE Certified, FCC Class B Listed
- Origin: Made in the USA
4.1 Dimensions
Detailed dimensions are provided for planning installation space.
Image 10: Technical drawing showing the dimensions of the Classic charge controller.
5. Maintenance and Warranty
5.1 Warranty Information
The MidNite Solar CLASSIC 200-SL MPPT Charge Controller comes with a 5-year warranty.
MidNite Solar offers an extended warranty program. Six months prior to the end of the initial warranty period, customers can ship their Classic back to MidNite Solar with a payment of $147 plus shipping. MidNite Solar will then replace any wearable parts and perform a general tune-up. This service extends the warranty by an additional 2 years.
