Question 1

Are you a manufacturer or a trading company?

Accepted Answer

We are a direct manufacturer. GREAT ENERGY (Shenzhen) has specialized in power electronics and power-quality equipment since 1998. Every GRT-VDC unit is designed, assembled, and 100% tested in our own factory - no middlemen, so you get factory pricing and full technical traceability.

Question 2

What is a Voltage Dip Compensator (VDC), and how is it different from a UPS?

Accepted Answer

A VDC (also called a Voltage Sag Compensator / Dynamic Voltage Restorer (DVR)) is purpose-built to ride through voltage sags and short interruptions. It uses ultracapacitor energy storage and injects the missing voltage within milliseconds, so sensitive loads never see the dip. Unlike a UPS, it has no batteries to replace, runs at >98% efficiency, stays cool, and is maintenance-free for 10+ years - the right, lower-cost answer to 'voltage flicker / hiccup' problems where a UPS is overkill. For a

Question 3

How fast does GRT-VDC respond, and how deep can it compensate?

Accepted Answer

Detection in 2 ms, full compensation in <4 ms - far faster than a UPS (5-95 ms). Compensation depth is 100%: even if grid voltage drops to 0 V, the load side stays at rated voltage. Standard ride-through is 1 second, customizable to 1-5 seconds for longer events.

Question 4

Which standards and certifications does GRT-VDC comply with?

Accepted Answer

GRT-VDC is CE marked, manufactured under ISO 9001 / 14001 / 45001, and compliant with SEMI F47 for semiconductor-fab voltage-sag immunity. Electrical safety and EMC follow IEC standards. Certificates are available on request and can be attached to your shipment.

Question 5

How do I select the right model for my application?

Accepted Answer

Tell us what you have, and we size it for you: If you have a single-line diagram or panel schedule: send it over and we recommend the exact model and capacity. If you have load details (rated voltage, power/kVA, sag frequency & depth, critical equipment): we return a matched solution, usually within 1 business day. If you have little information: our engineers can perform an on-site power-quality survey and deliver a professional report before you order. Typical ranges: single-phase 110/220 V, 3

Question 6

What is your minimum order quantity (MOQ), and do you supply samples?

Accepted Answer

MOQ is 1 piece (negotiable for projects). Samples are available: you pay the sample unit price plus freight, and the sample cost is deductible from your first bulk order (please confirm the deductible details with our sales team). This lets you validate real-world performance on your own load before committing.

Question 7

What are your payment terms?

Accepted Answer

Our standard terms are 30% deposit to start production and 70% before shipment; for other arrangements, please discuss the details with our sales team. For established partners or larger orders we also accept irrevocable L/C at sight and other mutually negotiated terms.

Question 8

What is the lead time?

Accepted Answer

For standard models (single-phase S-series and common three-phase ratings) lead time is 7-15 working days. For customized configurations (special voltage, capacity, or cabinet) it is typically 25-45 days depending on complexity. Exact time is confirmed against your order quantity.

Question 9

Do you offer OEM / ODM service?

Accepted Answer

Yes - full OEM/ODM: Private labeling on both product and packaging; Custom voltage (110/220/380/480 V), capacity, and wall/rack/cabinet form factors; NDA available to protect your market and margins; Dedicated R&D support for project-specific specifications. MOQ for customized OEM starts from small batches - contact us with your spec sheet.

Question 10

How is the product packaged and shipped?

Accepted Answer

Units are packed in strong cartons or plywood cases (export-grade, fumigation-free) with foam protection. We ship by sea or air under FOB / CIF / EXW per your preference, and can coordinate with your freight forwarder.

Question 11

Where have your VDC solutions been deployed?

Accepted Answer

GRT-VDC has protected 10,000+ critical loads across semiconductor fabs (lithography, CMP, wire bonding, etc.), automotive lines, and continuous-process industries (chemical, metallurgy, food). We work with both end users and overseas distributors. In these plants VDC is often deployed together with our active power filters (APF / AHF) and SVG static var generators to solve voltage sag, harmonics and reactive power in one power-quality package.

Question 12

Do you also supply APF, AHF, SVG and other power-quality products?

Accepted Answer

Yes. Beyond GRT-VDC voltage sag compensators, GREAT ENERGY manufactures a full power quality portfolio: active power filters / active harmonic filters (APF, AHF) for harmonic filtering and harmonics mitigation, SVG static var generators for reactive power compensation, power factor correction and three-phase load balancing. We can bundle VDC with APF / AHF / SVG into a single-panel or system-level solution. Share your harmonic and reactive-power profile and we will propose the right combination.

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