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Why choose GS Yuasa?
Intelligent battery sizing with ISY
Your advanced configuration tool for industrial power systems.
The smart way to size GS Yuasa batteries
ISY is GS Yuasa’s advanced, web-based battery sizing tool, designed to make industrial battery specification easier, faster and more accurate. Whether you need to size a simple backup system or configure a full-scale multi-string solution, ISY does the heavy lifting—calculating your optimum battery selection based on real-world performance and your project’s specific parameters.
With a sleek new interface, updated pricing and enhanced features, ISY is trusted by engineers, consultants and industry professionals across Europe. It’s your go-to tool for configuring VRLA and lithium batteries for any industrial application—UPS, renewable energy, telecoms, emergency lighting, energy storage and more.
What can you calculate with ISY?
Use ISY to perform real-time, detailed battery sizing and configuration for:
- Autonomy calculations – Find the exact GS Yuasa batteries needed to support a specified load (in W or A) over your desired runtime, across temperature ranges and ageing stages.
- Battery replacement mapping – Re-specify a GS Yuasa equivalent when replacing existing batteries using system specs, load requirements, or physical constraints.
- Cyclic or standby system sizing – Configure for frequent cycling or emergency backup, with recommendations for batteries, racks, terminals, installation accessories, and services.
Built for performance
The relaunched ISY platform includes a range of powerful upgrades:
- Fast, accurate calculations with improved algorithms and a more responsive interface.
- Real-world performance data from GS Yuasa’s full industrial battery range.
- Custom configuration builder with saved projects, shareable offers, and instant pricing (including accessories and services).
- Accessory and cabinet selection integrated directly into your system design.
- Easy comparison tools to view different sizing options for the same project.
Create your account to get started
To use ISY, you’ll need to register for a separate account. This ensures your saved projects, quotes, and preferences are stored securely and available whenever you log in.
Why choose ISY?
- Available 24/7
- Supports VRLA and lithium ranges
- Ideal for energy consultants, specifiers, engineers, and installers
- Constantly updated with latest pricing, specs, and battery innovations
“ISY is the most advanced and comprehensive battery sizing system on the market.”
– Christian Raynaud, Energy Technical & Quality Manager, GS Yuasa Battery France
