Nice Apollo SG-4 Solar Panel Regulator for Select Apollo Solar Gate Systems
The Nice Apollo SG-4 is a solar panel regulator for gate operator solar charging applications. In a solar gate system, the panel, battery, control board, and charge-regulation hardware all have to work together. A regulator is used to help control charging voltage from the solar panel so the battery is not simply tied directly to an unmanaged panel output. This is especially important on outdoor gate systems where sun exposure, temperature, battery age, and cycle demand can vary from site to site. The SG-4 is best treated as a replacement regulator for systems that originally used this part number, not as a universal solar upgrade for every Nice Apollo operator.
A failed or mismatched regulator can contribute to weak battery charging, overcharging symptoms, low run time, intermittent solar performance, or battery damage, but the solar panel, battery, wiring, fuses, and control board charging circuit should also be checked.
Compatible With
Use this regulator only on solar installations where SG-4 is specified or where the original regulator matches the SG-4 application.
- Select Nice Apollo 12VDC solar gate operator systems using SG-4 regulator hardware
- Legacy Apollo solar panel charging installations using a separate SG-4 style regulator
- Solar panel applications commonly listed in the 5W to 60W range where SG-4 is specified
- Apollo solar control boxes and battery systems that originally used SG-4
- Not a universal replacement for all Nice Apollo 1050, Mercury 310, or Juno charging circuits
- Not for direct connection to AC-powered operators without a matching solar charging design
Features & Specifications
| Manufacturer | Nice Apollo |
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| Product Type | Solar panel regulator |
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| Part Number | SG-4 |
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| Application | Solar charging regulation for select Apollo gate systems |
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| Compatible Operator Type | Select 12VDC solar gate operator systems |
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| Panel Range | Commonly associated with 5W to 60W solar panel applications |
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| Construction Notes | Outdoor-rated solid-state regulator in supporting listings |
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| Notes | Match voltage, panel wattage, battery type, and control-box wiring before replacement |
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Also Known As / Related Part Numbers
- SG-4
- SG4
- NICE-SG-4
- Apollo SG-4 regulator
- Apollo solar panel regulator
- MS solar panel regulator
- Solar regulator for Apollo gate opener
- Related application: 12V Apollo solar gate systems
- Related components: solar panel, battery, control board charging circuit, fuses, wiring harness
Technician Note
Do not diagnose a solar charging issue by replacing the regulator alone. Test the battery condition, panel output, wire polarity, fuse condition, and controller charging input. A weak battery or shaded panel can mimic a bad regulator.
Before Ordering Checklist
- Confirm the original regulator part number is SG-4 or SG4.
- Verify the gate system uses the correct DC battery voltage.
- Match the solar panel wattage to the regulator and operator charging design.
- Inspect polarity, wire condition, corrosion, and fuse protection.
- Do not wire a solar panel directly to a battery unless the system design specifically allows it.
Professional Advisory
Solar charging circuits and battery systems should be serviced with power disconnected and correct polarity observed. If wiring is damaged or the operator has repeated charging failures, have a qualified gate technician inspect the system.
Important Ordering Warnings
Newer Nice Apollo control boards may use different charging methods. SG-4 should not be assumed compatible with every current Nice Apollo solar operator or control box.
Product Questions & Answers
What does the SG-4 regulator do?
The SG-4 helps regulate solar panel charging output for select Apollo solar gate systems so the battery charging circuit receives controlled input.
Is SG-4 used on every Nice Apollo solar operator?
No. It should be used only where the original system or parts diagram specifies SG-4 or an equivalent supported regulator.
Can this fix a gate that is not charging?
It may if the regulator has failed, but low charging can also be caused by a weak battery, shaded panel, blown fuse, bad wiring, or a controller issue.
What solar panels is SG-4 associated with?
Supporting listings commonly associate SG-4 with 5W to 60W solar panel applications, but the final match depends on the gate system design.
Can I install this on an AC gate opener?
Only if the operator has a supported solar charging configuration. It is not a general AC power accessory.
