The Seiko V145A is a solar-powered analog quartz movement designed for precise, low-maintenance timekeeping. It is part of Seiko’s Eco-Drive-equivalent solar technology, engineered to harness light energy through the dial and convert it into electrical power. With a three-hand display and date function, the V145A combines traditional styling with modern solar innovation, offering a sustainable and user-friendly alternative to conventional quartz movements.

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Overview

The V145A movement belongs to Seiko's family of solar analog calibers, which are powered by a rechargeable battery (capacitor) that stores energy from light. It provides central hour, minute, and seconds hands, along with a quickset date display. This caliber is commonly found in Seiko’s solar dress watches, sports models, and everyday casual pieces.

One of the main advantages of the V145A is its ability to run for months on a full charge without further light exposure. It also eliminates the need for frequent battery changes, making it eco-friendly and low-maintenance.

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Key Features

• Solar Charging System: Converts light (sunlight or artificial) into energy.

• Three-Hand Display: Hour, minute, and central seconds hands.

• Quickset Date: Located at the 3 o'clock position (varies by case).

• Overcharge Prevention: Built-in circuitry protects the rechargeable battery.

• Power Reserve: Up to 6 months on a full charge.

• Low Energy Warning: Second hand moves in 2-second intervals when power is low.

• Hacking Seconds: The second hand stops when the crown is pulled out.

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Technical Specifications

• Caliber: Seiko V145A

• Movement Type: Solar Quartz (Analog)

• Battery Type: Secondary rechargeable cell (not user-replaceable with standard silver oxide battery)

• Power Reserve: ~6 months (full charge)

• Charging Time:

  • ~3 hours under sunlight for one day of operation

  • ~5 hours under strong light for full charge

• Accuracy: ±15 seconds/month

• Jewel Count: 0

• Dimensions:

  • Diameter: Approx. 27.4 mm

  • Thickness: Approx. 3.3 mm

• Hand Hole Sizes:

  • Hour: 1.20 mm

  • Minute: 0.70 mm

  • Second: 0.20 mm

The movement fits well in mid-size and larger cases, often 38–44 mm in diameter.

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Setting Instructions

Crown Positions:

• Position 0 (Pushed In): Normal operation.

• Position 1 (Pulled One Click): Quickset date – turn crown clockwise to advance the date.

• Position 2 (Pulled Two Clicks): Time setting – stops second hand for precise adjustment.

Note: Avoid setting the date between 9:00 PM and 3:00 AM to prevent gear damage.

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Charging and Power Management

To charge the watch:

• Expose the dial to direct sunlight or strong artificial light.

• Avoid heat buildup during charging (e.g., on a car dashboard).

• If the second hand starts ticking every 2 seconds, it's in low energy mode—charge immediately.

Once charged, the watch can operate in total darkness for up to 6 months, depending on the model and power usage.

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Servicing and Maintenance

• The rechargeable cell is not a standard battery and should only be replaced with a genuine Seiko part if needed.

• No AC reset is required after charging or servicing.

• Do not install silver oxide batteries—they are incompatible and may damage the movement.

• Clean the solar panel/dial area gently when servicing to maintain light absorption.

• Always replace gaskets and pressure test after opening the case if the watch is water-resistant.

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Common Issues

• Second Hand Moves Every 2 Seconds: Indicates low power reserve. Recharge under light.

• Watch Stops Completely: Fully discharged cell—requires extended charging under bright light.

• Date Doesn’t Advance: Caused by setting during restricted hours or internal obstruction.

• Short Power Reserve: Cell may be aging; consider replacement by an authorized service center.

• Dial Doesn’t Charge Properly: Obstruction or damage to solar panel/dial—inspect under magnification.

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Conclusion

The Seiko V145A is a reliable, eco-conscious movement ideal for wearers who want hassle-free, precise timekeeping without the need for battery replacements. Its solar-powered architecture and traditional display offer the best of both analog charm and modern energy efficiency. For everyday wear or occasional use, the V145A provides an excellent balance of sustainability, style, and performance.

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