Application
Standalone PV-plus-storage power for sites with no grid or an unreliable grid, with optional grid-forming control.
Solution
Off-Grid & Weak-Grid
Standalone PV-plus-storage power for sites with no grid or an unreliable grid, with optional grid-forming control.
Project lens
Sunket Supply scope
Product supply, inverter matching, European warehouse coordination and project-scoped support.
Best fit
Commercial and industrial buyers, installers and distributors planning energy projects in Europe.
The challenge
Power where the grid can’t deliver
Remote sites, islanded operations and weak-grid locations require a purpose-engineered power system rather than a standard grid-connected configuration.
No grid connection — or one so unstable that production and equipment are at risk.
Diesel-only supply can carry high fuel, logistics, emissions and maintenance costs.
A standalone design must define voltage and frequency regulation, load priorities, autonomy and recovery behaviour.
How it works
How an off-grid system works
PV, storage, power conversion, transfer equipment and optional generation must be sized and controlled as one site-specific microgrid.
- 01
PV generation
A PV array sized for daytime load and battery charging is the primary energy source.
- 02
Power conversion & controls
The approved inverter, transfer equipment and microgrid controls must establish and regulate the site supply; capability is confirmed for the selected model, firmware and wiring.
- 03
Battery storage
The Hithium battery can store surplus PV within the project operating limits and autonomy design.
- 04
Supply balance
Load priorities, reserve margin and any genset contribution are engineered around weather, autonomy targets and acceptable load shedding.
Design references
System specifications
01261 kWhHithium storage building block
02Site-specificautonomy and load priorities
03Pre-confirmedoff-grid operating capability
Product specifications are indicative for the Hithium 261 kWh C&I storage class. Final equipment, operating functions and project outcomes depend on the selected architecture, model and firmware, available interfaces, site design, tariff and local grid requirements, and are confirmed in the project quote.
Sunket Supply scope
What Sunket Supply supplies
Reference equipment
A practical, project-matched equipment stack
The final architecture may use an integrated Hithium PCS or the confirmed-compatible Hithium DC cabinet and Growatt WIT hybrid-inverter route. Equipment is selected against the site design.
High-power TOPCon PV moduleTongwei TWMNF-66QDView product range
261 kWh liquid-cooled DC battery cabinetHithium 261 kWh DC CabinetView product range
63–125 kW three-phase C&I hybrid inverter rangeGrowatt WIT 63–125K-XHUView product rangeExact model, firmware, interfaces, available quantity, dispatch warehouse and delivery timing are confirmed in the project quotation.
Current product range
Tongwei PV modules and Hithium 261 kWh liquid-cooled storage, using either the integrated-PCS or external Growatt hybrid-inverter architecture only where off-grid duty is explicitly confirmed.
Site architecture
Required transfer equipment, microgrid controls, protections and any genset interface are defined with qualified local designers and suppliers.
Project coordination
Product documentation and interface review; final off-grid design, installation, commissioning, validation and ongoing service responsibilities are agreed per project.
FAQ
Frequently asked
Can the system run fully off-grid?
A fully off-grid project requires confirmed grid-forming and transfer capability, sufficient battery power and energy, suitable controls, protections and often dispatchable backup generation. The current product architecture must be reviewed model by model before it is offered for this duty.
Does it work on a weak or unstable grid?
Weak-grid operation depends on the disturbance type, grid code, inverter function, firmware, protections and local network approval. It must be confirmed through project engineering rather than assumed from the product category.
Can batteries be installed securely on remote sites?
Security, enclosure location, access, environmental conditions, fire safety and manufacturer installation requirements must be assessed for the site. Any indoor or protected layout requires explicit product and local-code approval.
Request a project-specific quote
Share your site profile and Sunket Supply returns a tailored, priced quote within 24 hours, with product availability and delivery scope confirmed.