A chest freezer is one of the few appliances that runs every hour of the year, which is why the electricity bill it generates is usually larger than the price paid for it. The Direct Drive 2 is built to attack that bill from two directions: it takes its power straight from a solar panel whenever the sun is up, and it falls back to the mains only when there is nothing to harvest. No battery sits in between - so nothing is lost in charging, and nothing has to be replaced every few years.
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Zero battery, zero battery cost The most expensive part of a solar freezer is rarely the freezer. It is the battery bank sized for the worst week of the year, plus the charge controller, plus the replacement three or four years later in a place where replacement is difficult to arrange. Direct Drive 2 removes that component entirely. The panel feeds the compressor while the sun is up; the foam holds the cold while it is not. Fewer parts to buy, fewer parts to fail, and no consumable chemistry deciding how long the cabinet lasts. |
Two inputs, one automatic decision
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Dual power connection & auto switching Connection 1 takes DC 10–50 V straight from the photovoltaic array. The wide window matters: a 12 V panel, a 24 V array and a 36 V string can all be wired to the same cabinet without a separate controller, which is what makes the unit practical for installers working with whatever panel is available locally. Connection 2 takes AC 110–240 V through the supplied adapter, from the mains or from a small generator. The cabinet switches on its own. Solar is used first whenever it is present, and AC picks up the load when the sun drops - no rewiring, no manual changeover, no interruption to the cooling cycle. |
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Sunlight is the fuel
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Photovoltaic cooling only pays off where the panel and the cabinet are matched. A panel that is too small will run the compressor at half speed and the pull-down will never finish; a panel that is oversized is money left in the sun. The Direct Drive 2 is specified against your site, not against a laboratory condition. Because the controller is inside the cabinet, the array does not need to match a battery voltage. Anything from a single 12 V module to a 36 V string works, as long as the wattage is right for the daily load. The cabinet starts cooling the moment the array is connected - no commissioning sequence, no battery to form, nothing to program. |
Where the saving actually comes from
Energy saving is not one feature, it is the sum of three decisions taken at the design stage. The table below separates them, because each one can be dropped by a cheaper supplier and each one takes part of the saving with it.
| Direct solar drive | Power is consumed as it is generated during daylight, so no energy is spent on charging and discharging a battery. In peak sun hours the cabinet runs at zero electricity cost. |
| 65 mm / 110 mm foam | A double-foamed wall is what holds temperature overnight. Two specifications are offered: 65 mm for ordinary commercial duty, 110 mm for long outages and high ambient sites. |
| Mechanical control | A precision dial instead of an electronic board. It holds its setting, it does not draw standby power, and it can be serviced by a shopkeeper rather than an electronics technician. |
Four advantages, stated plainly
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1. Zero battery cost The battery bank and its controller are removed from the bill, and there is no replacement cycle to budget for. |
2. Free daytime cooling The compressor runs on the array through the strongest hours of the day, which is exactly when a shop's cooling load peaks. |
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3. Cooling that does not stop When the sun goes, the adapter takes over automatically. Stock is protected through the night, through rain, and through an outage. |
4. Insulation that keeps the gain 65 mm or 110 mm double-foamed polyurethane, so the cold bought during the day is still in the cabinet the next morning. |
Build details that decide service life
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Top-open door with safety key lock. One-hand opening, and a lock that keeps contents away from unauthorised hands - relevant in shared shops and staff canteens. Heavy-duty universal wheels. The cabinet is moved far more often than a domestic freezer: restocking, cleaning, repositioning for foot traffic. Four casters rated for loaded weight, not display weight. Mechanical precision dial. Temperature is set by hand and stays set. There is no menu to lock up, no board to fail after a voltage spike. |
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Using the array you already have
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Many of our buyers already run an array for lighting or pumping, and want the freezer to sit on the same DC bus. Because the input window is 10–50 V, that is usually possible without replacing the panels - what changes is the cable run and the connector, not the array. Where a site intends to add cabinets later, we size the array with headroom from the start. Adding a second cabinet to an array that was already oversized costs a cable; adding it to an array that was sized for one cabinet costs a new array. For sites with a weak grid rather than no grid, the AC adapter can be ordered matched to the local voltage so the cabinet runs from the wall when the sun is low and from the panels when it is not. |
Technical specifications
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Model |
Direct Drive 2 |
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Type |
Solar direct drive chest freezer, AC hybrid |
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Solar input |
DC 10–50 V wide range, panel direct |
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AC input |
AC 110–240 V through supplied power adapter; generator compatible |
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Battery |
Not required - zero battery design |
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Foam thickness |
65 mm standard / 110 mm high-efficiency, both available |
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Cabinet dimension |
1120 × 600 × 850 mm (W × D × H) |
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Door and lock |
Top-open flap lid with safety key lock |
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Mobility |
Heavy-duty universal casters |
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Control |
Mechanical temperature dial |
Cabinet volume, panel wattage and adapter rating are confirmed per order against your ambient temperature, sun hours and daily load. Tell us the site and we will size it; we do not ask buyers to guess from a catalogue number.
Four places this freezer pays for itself
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Commercial shops and convenience stores. The cooling load peaks in daylight, which is precisely when the panel is producing. Daytime running cost drops to zero and the evening peak is carried by stored cold plus a short mains top-up. Homes and farms. A rooftop array can be plugged in directly - no inverter, no battery room. Useful for preserving produce, meat and dairy where the grid reaches the house but fails often enough to spoil a week's work. Island resorts and camps. Quiet operation matters where guests sleep nearby, and diesel generators are both noisy and expensive to feed. |
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Weak grids and high-tariff areas. Where supply is intermittent, the automatic switchover keeps the cabinet cold through the gaps without an operator standing next to it - and where the tariff is high, the daytime load simply disappears from the bill.
Packing and delivery
Cabinets are packed in export cartons with corner protection and shipped on pallets for container loading. For distributors building a local business we supply finished units, or SKD and CKD kits for assembly in country - including the tooling and process guidance that goes with it.
Factory Introduction
Our service
Our factory has advanced equipment-automated welding/forming machines, auto foaming line, imported leak detectors/pressure meters-ensuring precise production, quality control, efficient output, and on-time deliveries.
- Manufactured using high-grade, wear-resistant materials, the compressor is engineered to withstand harsh conditions and continuous operation. It is the cornerstone of the Solar Ice Maker's reputation for longevity.
- With a proven track record in research and rigorous quality assurance, we empower your market expansion by delivering superior-quality, dependable solutions that excel in competitive landscapes. Our innovative products, fortified by deep technical expertise, ensure your brand stands apart and drives share growth.
- We provide unparalleled post-purchase support through a robust warranty package and dedicated service teams, fostering long-term customer trust with efficient troubleshooting and proactive assistance.
Factory advantages
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- MOQ is as low as 1 piece for DC solar freezers, making business initiation straightforward for retailers and distributors worldwide.
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Our facility has advanced equipment: automated welding & forming machines, auto foaming line, and imported leak detectors/pressure meters. These ensure precise production, quality control, efficient output, and on-time deliveries.
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- Benefiting from a prime location near Yiwu port, Shanghai port, and Ningbo port, we enable smooth export processes and reduce logistical complexities.
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Dedicated to rapid resolution of customer inquiries, we prioritize precision in support-delivering tailored insights and solutions to elevate satisfaction and solidify long-term partnerships.
Patent Certificate
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Patent Certificate
Patent Certificate
Patent Certificate
Inside Juka - How This Freezer Is Made
Hangzhou Juka Solar Technology Co., Ltd. was founded in 2015 with a single focus: combining solar energy, new energy and smart technology with refrigeration. Today we design and manufacture solar cold-chain products - solar freezers, solar refrigerators, solar ice makers, solar mobile ice-cream carts, ice-cream delivery tricycles and beverage retail carts.
Every product we make is exported. Our customers are mainly in Belt and Road countries and regions, and our work does not stop at the container: we help partners set up their own local production facilities for retail and delivery refrigeration products - creating jobs, improving living standards, and switching more of the cold chain onto clean energy.
Manufacturing and Testing Equipment
| Equipment | What it does for you |
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| Automatic laser cutting machine | Consistent panel geometry, tight tolerances, clean edges |
| Punch press and bending machine | Accurate, repeatable cabinet forming |
| Automatic dual-gun high-pressure foaming machine | Even foam density across the whole cabinet - no thin spots |
| CACL high-precision dual-system filling machine | Precise refrigerant charge, unit after unit |
| INFICON high-sensitivity leak detector | Finds leaks that ordinary detectors miss |
Quality Control, Step by Step
Foaming takes place in a constant 20–23 °C foaming room, removing seasonal variation from foam quality.
Nitrogen purging on both the condenser and evaporator sections before any pipe connection, to protect internal circuit cleanliness.
Vacuum standard of below 20 Pa. A unit that does not reach spec is not charged with refrigerant - no exceptions.
Two leak tests per cabinet with an INFICON detector: once unpowered, once running.
Constant-temperature test room confirms refrigeration parameters, so units are tested under identical conditions year-round and performance claims stay honest.
Separated production and quality control. Only cabinets signed off by a QC inspector can be packed and warehoused. Production answers to production; quality answers to quality.
A dedicated process and quality assurance department maintains written process standards for every stage.
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OEM & Customization Services
Build Your Own Solar Freezer Brand
We support customized solutions for global customers.
Available customization:
✔ Customer logo
✔ Cabinet color
✔ Voltage options
✔ Plug type
✔ Packaging design
✔ Product configuration
We also support:
OEM
ODM
SKD
CKD cooperation
Helping partners build their own local refrigeration business.
Get a configuration and a price
Send us your site's average sun hours, ambient temperature range, the products you store and the volume you need to hold. We will come back with a matched configuration - cabinet size, foam specification, panel wattage and backup method - and the price for your quantity.
Minimum order is one piece for DC direct-drive models. Mixed containers are accepted for first orders.
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