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SunStar Solar Freezer 21CU ST-21CF
$2,127.00 - $2,294.00
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Availability: In Stock. Secure yours TODAY!
Capacity: 21 Cu Ft / 595 Liter Capacity
Exterior Dimensions: W 82.25 x H 37.75 x D 30.75
- Standard Freight ($235): š Call us for a shipping quote to AK, CO, HI, and MT, or to order more than one unit.
- 100% American Made: Superior build quality ensures your appliance arrives ready for years of dependable service.
- Risk Free Purchase: Backed by SunStarās comprehensive 2-Year Performance Warranty.
- Off-Grid & Solar Ready: Native 12V/24V DC operation connects directly to your battery bank.
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- Description
- Shipping, Returns & Warranty
- Best Price Guarantee!
- Why Buy From Us
- Warranty & Support
Description
SunStar Solar Chest Freezer 21CU ST-21CF
Available in AC & DC ā Maximum Capacity for Off-Grid Living
The SunStar Solar 21CU ST-21CF Chest Freezer is the ultimate high-capacity off-grid freezing solution ā made in the USA and available in both AC and DC configurations. Whether you're storing bulk groceries for a large family, preserving a seasonal harvest, or stocking up for extended off-grid adventures, the ST-21CF delivers consistent, reliable performance with every use.
Choose the AC model to run on solar or grid power with seamless backup, or go fully independent with the DC model ā powered exclusively by 12V or 24V solar with no inverter required. Both feature a double lid gasket, 4.6" polyurethane insulation, and a solar-optimized compressor for maximum efficiency.
- ā Made in the USA
- ā 21.5 Cu Ft / 609 Liter Capacity
- ā Double Lid Gasket for Superior Seal
- ā Multi-Function Thermostat: Freeze or Refrigerate
- ā 4.6" Polyurethane Wall Insulation
- ā Available in AC (115V) or DC (12V/24V Auto)
Engineered for True Off-Grid Performance
Solar-Ready Design
The DC model runs directly off 12V or 24V solar with automatic voltage detection ā no inverter needed. The AC model supports both grid power and solar-sourced AC for homes that want flexible energy options and a reliable backup.
Double Lid Gasket & Superior Insulation
A double lid gasket creates an airtight seal that dramatically reduces temperature loss every time the lid is opened. Combined with 4.6" polyurethane walls, the compressor runs less and your solar bank lasts longer.
Built for the Way You Live Off-Grid
Dual-Mode: Freeze or Refrigerate
The multi-function thermostat gives you full control over storage temperatures, letting you switch between deep-freeze and refrigeration modes to suit your needs ā all from one appliance.
Built-In Lid Light & Status Indicators
A built-in lid light makes organizing and retrieving items easy in low-light conditions. Dedicated operating indicator lights simplify troubleshooting, even in the most remote settings.
High Efficiency, Low Power Draw
The super-high-efficiency, solar-optimized compressor keeps energy use minimal. The AC model draws just 95W at 0.82A; the DC model draws 105W ā both built to run reliably across varying solar conditions.
Durable & Mobile
A corrosion-resistant exterior stands up to demanding environments. Pre-installed heavy-duty castors let you reposition this large-capacity freezer with ease, whether it's in a basement, barn, or garage.
Choose Your Model
AC Model 
21CU AC Chest Freezer
ā¼ Click to view details
- Runs on 115V AC / 60Hz.
- Ideal for energy-conscious homes, remote cabins, and anyone who wants to reduce electricity bills using solar AC power while keeping reliable grid backup.
- Rated at 95W typical draw.
DC Model 
21CU DC Chest Freezer
ā¼ Click to view details
- Powered directly by 12V or 24V DC solar ā no inverter required.
- Built for total off-grid independence in remote cabins, RVs, boats, and homesteads with no grid access.
- Rated at 105W typical draw.
Maximum Capacity. Precision Cold.
The ST-21CF's spacious interior ā measuring 72.75" W Ć 19.5" D Ć 27.375" H ā is sized for serious storage needs. Whether it's a large grocery haul, bulk game meat, a full garden harvest, or long-term emergency food supply, this freezer has room for all of it.
Sun Star's commitment to quality shines through in every detail ā from premium materials and rigorous testing to long-lasting performance that customers can rely on for years.
Technical Specifications
| Specification | AC Model (ST-21CF-AC) | DC Model (ST-21CF-DC) |
|---|---|---|
| Origin | Made in the USA | Made in the USA |
| Power Source | 115V AC / 60 Hz | Automatic 12V or 24V DC |
| Fuse Rating | 15 Amp | 15 Amp |
| Typical Power Draw | 95W / 0.82A | 105W |
| Total Volume | 609 Liters / 21.5 Cu Ft | |
| Cooling System | Direct Cooling | |
| Refrigerant | R134A | |
| Wall Insulation | 4.6" Polyurethane | |
| Lid Gasket | Double Lid Gasket | |
| Temperature Control | Multi-Function Thermostat (Freeze / Refrigerate) | |
| Interior Dimensions (in) | W 72.75 / H 27.375 / D 19.5 | |
| Exterior Dimensions (in) | W 82.25 / H 37.75 / D 30.75 | |
| Additional Features | Built-In Lid Light, Operating Indicator Lights, Pre-Installed Heavy-Duty Castors | |
SunStar Solar 21CU Chest Freezer FAQs
What is the difference between the AC and DC models?
The AC model (ST-21CF-AC) runs on 115V AC / 60 Hz, making it compatible with both standard grid electricity and solar-sourced AC power through an inverter ā ideal for homes and cabins that want to cut energy bills while keeping a reliable backup. The DC model (ST-21CF-DC) connects directly to 12V or 24V DC solar systems with no inverter required, making it perfect for fully off-grid living in remote cabins, RVs, and boats.
How much storage does the 21CU chest freezer have?
Both models offer 609 liters (21.5 cubic feet) of storage. The interior measures 72.75" wide Ć 19.5" deep Ć 27.375" high ā spacious enough for large grocery hauls, bulk game meat, full garden harvests, and long-term emergency food supplies.
What makes the double lid gasket important?
The double lid gasket creates a tighter airtight seal compared to a single gasket. This means less cold air escapes each time you open the lid, which keeps internal temperatures more stable, reduces how often the compressor needs to run, and ultimately draws less power from your solar system.
Can it function as a refrigerator as well as a freezer?
Yes. The multi-function thermostat lets you switch between deep-freeze and refrigeration modes, giving you the flexibility to store fresh produce or refrigerated goods when you don't need the full freezing capacity.
How energy-efficient is it on a solar system?
Both models are engineered for super-high efficiency. The AC model draws approximately 95 watts (0.82A) and the DC model draws approximately 105 watts under typical operating conditions. The 4.6" polyurethane insulation and double lid gasket work together to reduce compressor run time and minimize strain on your battery bank.
Does the DC model work with both 12V and 24V systems?
Yes. The DC model features automatic 12V or 24V voltage detection ā it adjusts automatically so no manual switching is needed. This makes it compatible with the vast majority of residential and mobile solar setups.
Is the 21CU easy to move and reposition?
Yes. Heavy-duty castors come pre-installed, so despite its large size you can roll and reposition it with ease ā whether that's in a basement, barn, garage, or between outbuildings. No lifting or dragging required.
What refrigerant does the ST-21CF use?
Both models use R134A refrigerant ā a widely available, well-understood refrigerant that delivers reliable performance across a broad range of ambient temperatures.
Shipping, Returns & Warranty
- Standard Freight Shipping ā $235: Shipping to AK, CO, HI, or MT, or ordering more than one unit? Call us at 1-844-945-3625 for a custom shipping quote.
- Hassle-Free Returns: Not what you expected? Return any unopened item within 30 days ā you just cover the return shipping.
- Built to Last: Every SunStar Solar Chest Freezer is backed by a manufacturer's warranty. Contact us for full warranty details.
The SunStar Guarantee ā We know you're going to LOVE your SunStar! If things aren't perfect, here is our promise to you:
- Arrives Perfect: If your item arrives defective or incorrect, let us know within 14 days and we will gladly work with SunStar to replace it.
- Final Sale: Because SunStar is so confident in their product, they do not accept returns for buyer's remorse.
- Refused Deliveries: Packages refused at the door will incur a 15% restocking fee plus applicable shipping costs.
Best Price Guarantee!
Best Price Guarantee
You'll get the best price available at Wild Oak Trail! We'll match anyone who has it lower!
We love to chat! Give us a call and we'll see what we can do to get you the best deal!
Conditions of our 100% Price Match Guarantee:
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Contact us to discuss the Price Match so we can look up the competitors price
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Buy one, get one free offers and Rebates are not eligible
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The item must be in stock on the competitors website
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The competitor must be an online store, not a retail location
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The website can't be a discounter or auction website ( such as eBay, overstock, etc.)
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The company must be an Authorized Retailer of the product in question
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The Price Match Guarantee is based on the final price of the product including shipping and taxes
Why Buy From Us
Why Buy From Wild Oak Trail?
We’re a family-run business. My Wife Hailey and I run this business with our small staff of 3 awesome people. When you shop with Wild Oak Trail, you're supporting real people, not a big corporation.
We truly care. We’re here before, during, and after your purchase. Good products and great service—that’s how we earn your trust. We see and celebrate EVERY sale that comes in!
We choose quality. If we wouldn’t use it ourselves, we won’t offer it. Our goal is to make you happy enough to tell your friends.
Thanks for supporting our family and being part of the Wild Oak Trail community!
Warranty & Support
SunStar® Solar Appliance Warranty Policy
Your Coverage & Protection At Wild Oak Trail, we stand behind the quality of the products we carry. Your SunStar® solar freezer or refrigerator is backed by a limited manufacturer’s warranty protecting you against defects in materials and workmanship. This coverage remains valid for the specific duration listed on your product’s documentation, beginning on your original date of purchase.
Service & Resolutions If a manufacturing defect is discovered within the warranty period, SunStar® reserves the right to repair or replace the defective unit or component at their discretion. Any repairs or replacements will be completed using new or refurbished parts that meet or exceed the original factory quality standards.
What Is Not Covered (Exclusions) To ensure your coverage remains valid, please use the unit as intended. This warranty does not cover damage resulting from:
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User Action: Misuse, negligence, accidental damage, improper installation, or unauthorized modifications.
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External Events: Power surges, natural disasters, or other "Acts of God."
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Consumables: Routine wear items such as light bulbs or batteries are not included in this warranty.
How to Initiate a Claim We are here to help you facilitate this process. To start a warranty claim, please have the following information ready:
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Model Number
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Serial Number
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Proof of Purchase (Receipt showing date and place of purchase)
Once you have these details, please contact the Wild Oak Trail support team directly. We will document your issue and guide you through the next steps to get your unit back up and running.