The Epson VS75 is a solar-powered quartz chronograph movement. Epson lists it in the VS7 Solar Chronograph family with a 1/5-second chronograph, 4.40mm movement height and approximately six months of power storage when fully charged.
Unlike a conventional disposable-battery quartz movement, the VS75 uses light to charge a rechargeable secondary cell. That means the movement should be kept exposed to suitable light rather than treated as a normal quartz calibre that needs routine silver-oxide battery replacement.
Official references: Epson VS75 product page and the VS75 user guide.
VS75 Movement Specifications
| Specification | VS75 |
|---|---|
| Movement type | Solar quartz chronograph |
| Chronograph | 1/5-second center chronograph |
| Movement height | 4.40mm |
| Power storage | Approximately 6 months from full charge |
| Published accuracy | Mean monthly rate ±20 seconds at 5°C to 35°C |
| Operating temperature | -5°C to +50°C |
How Does the VS75 Solar System Work?
A solar cell below the dial converts light into electrical energy and charges a rechargeable secondary cell. Epson's guide says the watch can operate for about six months from a full charge under the stated conditions.
When charge becomes low, the seconds hand can move in two-second intervals as a warning. That behavior indicates low stored energy and the watch should be exposed to light according to the watch manufacturer's charging guidance.
Is the VS75 a Mechanical Chronograph?
No. It is a quartz chronograph. The chronograph can measure elapsed time in 1/5-second steps, but the movement is electronically regulated rather than mechanically escapement-driven.
VS75 in the Tactical Frog Solar Chronograph
The current Tactical Frog VS75 Solar Chronograph uses the Japan VS75 solar quartz movement. Its product listing specifies a 41mm 316L stainless-steel case, 49mm lug-to-lug length, 12.5mm thickness, sapphire crystal, ceramic bezel and stated 200m water resistance.
Those are finished-watch specifications, not properties of the movement itself. Other watches using VS75 may use different cases, crystals, bezels and water-resistance constructions.
Frequently Asked Questions
Does the VS75 need a normal battery replacement?
It uses a rechargeable secondary cell charged by light rather than a conventional disposable silver-oxide battery. Service may still be required over the life of the watch, but routine ownership is based on charging the watch with light.
How long can the VS75 run when fully charged?
Epson publishes approximately six months of power storage from a full charge.
How accurate is the VS75?
The user guide specifies a mean monthly rate of ±20 seconds when worn at 5°C to 35°C. That is the published movement specification, not a guarantee of identical performance in every finished watch and environment.
For other solar and battery-powered watches, browse our quartz watches.
