Module-level (distributed) solar storage places storage units at the PV side, close to the modules, beneath selected panels or alongside selected modules, instead of in a single location. The configuration is planned around array layout and energy path, with EMS, edge gateway, BMS, optimizer, protection and communication scope defined for the selected equipment; units are added in project-defined stages.
KingNeed presents three storage configurations on its Distributed Solar Energy Storage series page. The PV-Side Distributed Energy Storage System brings storage into the PV-side architecture, close to the modules that generate solar power, and plans distributed deployment around the array layout, available mounting space and the role storage should perform. Capacity, expansion limits and included control functions are defined for the selected equipment.
This page explains how the approach works in plain terms: where the storage sits, how energy and control are arranged, how a project expands and how it is serviced. It does not give capacity, electrical values or commercial terms; those come from the model-specific technical documents for the selected configuration.
What is module-level solar storage?
“Module-level solar storage” is used here as an umbrella term for panel-level, under-panel or module-side storage: storage units are distributed across the PV side of the system, near the modules they work with, rather than grouped in a single location. It is a description of an architecture, not a KingNeed product name.
KingNeed publishes three concepts that fit under this term:
- PV-side distributed energy storage system: a configurable PV-side, component-level energy-storage concept presented for selected new-build and retrofit solar projects.
- Panel-level distributed DC energy storage system: storage beneath selected PV panels.
- Distributed PV energy storage bar: module-side storage for phased projects.
To compare the three by installation location, retrofit scope and assembly model, use the PV-Side and Panel-Level Solar Storage: Selection Guide.
Where the storage sits: PV-side, under-panel and module-side
PV-side. The PV-side system places storage at the PV side of the system and plans the configuration around the array, energy path and intended use. The storage sits close to the modules that generate solar power.
Under-panel. The panel-level distributed DC energy storage system places independent storage units beneath selected solar panels to create a distributed DC storage architecture. Under-panel placement is planned around the selected panel positions, mounting space, structural conditions and maintenance access. The page describes storage beneath selected panels, so the mounting arrangement and selected module and equipment requirements are confirmed for the actual site.
Module-side. The distributed PV energy storage bar installs distributed storage close to each selected PV module. Planning starts by identifying the selected PV modules, existing equipment and proposed installation positions, then confirming module layout, mounting, electrical interfaces and the offered equipment before choosing an installation scope.
How energy moves: the PV-side energy path and DC architecture
On the PV-side system, the storage configuration is connected with solar generation and the intended energy-delivery path. The project reviews module-level optimization and the proposed conversion arrangement for the selected equipment and operating mode, so the energy path is a design decision for each project rather than a fixed product feature.
The panel-level concept distributes low-voltage DC storage directly at the panel level. No voltage or current value is published for it: the DC voltage and current interfaces, retained equipment, isolation and protection responsibilities are confirmed for the project.
At system level, the useful question is how the proposed storage relates to the DC bus, source equipment, loads, protection, controls, installation environment and maintenance responsibility. For the design method behind that question, see Distributed DC Micro Storage for Modular Energy Architectures.
How control and protection are coordinated
Control and protection are defined as a scope for the selected configuration, not as fixed features. On the PV-side system:
- Energy management and communication: the available EMS, edge gateway and communication arrangement is reviewed as part of the system scope.
- Component-level control and protection: the optimizer, BMS, protection and communication components are reviewed together with the system configuration.
- Supply boundary: agree which devices and functions are included in the supply, and request the relevant model-specific technical documents.
The selection guide makes the same point: control, communication and protection components depend on the chosen configuration, so confirm what is included in the proposed system. At project level, define which system records an event, who reviews an alarm and what happens when communications are unavailable. Changes to protection or control logic follow the project’s approved engineering process.
How it differs from a single central storage installation
A central storage installation is usually placed in a single location and connected to the system there. Module-level storage distributes storage units across the PV side, beneath selected panels or close to selected modules, so the plan covers each unit position, the interfaces at that position and access to each unit.
The difference described here is placement and architecture only. It is not a performance ranking, and neither approach is presented as better in general. Which architecture fits a project is decided against its array layout, equipment, site conditions and operating objectives.
How staged expansion works
Distributed storage is planned so that a project can start with selected panels or modules and add units in project-defined stages:
- Plan the first stage: plan an initial configuration and the conditions for later expansion. Define the first-stage scope, operating requirements and review criteria before expansion.
- Agree the conditions for adding units: a practical modular plan defines the smallest useful deployment unit, the conditions for adding another unit, and the data required before expansion is approved.
- Review before expanding: review usable capacity, electrical limits, protection, control interfaces and installation scope for the offered units. Each increment still needs to be evaluated as part of the whole system.
Modular expansion still requires an approved project design. The phased expansion concept on the storage bar page is not a stated capacity rating; request model-specific capacity and electrical ratings. For an existing array, the retrofit checklist for adding storage to an existing solar PV system covers what to document before the first stage.
How service and maintenance are planned
Because storage units are spread across the array, service is planned at component level. Build maintenance access into the project from the start, and include unit identification, fault review, replacement access and service responsibilities in the deployment plan, with the documentation needed to support the selected configuration.
- Access: under-panel placement is checked for maintenance access at the selected panel positions.
- Records: keep clear equipment identification, current documentation and a defined process for inspection and replacement. A consistent asset record, approved service procedure and local contact model make it easier to manage those responsibilities as the system expands.
- Monitoring: where configured wireless O&M options are offered for module-level devices, such as status reporting and fault location, the compatible gateway and platform are selected for the project. Monitoring data can help operations understand the state of an installation, but it is not a replacement for maintenance inspections.
Where module-level storage is planned
KingNeed discusses commercial rooftops, existing PV installations, telecom sites, industrial loads and other distributed solar projects for the PV-side system. The panel-level concept lists telecom sites and commercial rooftops among its planning scenarios, and the storage bar supports rooftop, commercial and PV-plant retrofit planning. In each case, share the generation profile, loads, site conditions and intended operating role so the project scope can be defined.
- Commercial and industrial rooftops: planning begins with measured PV generation, site loads, operating hours and installation constraints; see Applying Distributed Micro Storage in Commercial and Industrial Solar Design.
- Telecom and remote sites: planning starts with the site load, existing DC equipment, operating requirements and maintenance access, with a site-specific configuration; see Micro Storage for Telecom and Remote-Site Power Design.
Where module-level electronics fit
Module-level power electronics are separate devices from the storage units. The PV Digital Optimizer provides configured module-level MPPT designed for shading, mismatch and other panel-level differences, with a one-to-two dual-panel input where the selected wiring and model support the arrangement. The PV Rapid Shutdown Device provides an independent module-level shutdown path that reduces module-side DC output after a configured trigger; confirm the trigger arrangement, measured voltage and shutdown time for the selected device. In a storage project, the PV-side system review includes module-level optimization alongside the storage configuration, and whether a project needs either device depends on its design.
What is panel-level energy storage?
Panel-level energy storage places storage units at the panel level of a PV array rather than in a separate storage location. The Panel-Level Distributed DC Energy Storage System places independent storage units beneath selected solar panels to create a distributed DC storage architecture. The mounting arrangement and selected module and equipment requirements are confirmed for the actual site.
Is module-level storage the same as a central battery?
No. The difference is placement: a central storage installation is usually located in a single place, while module-level storage distributes storage units close to selected PV modules or panels. This describes the architecture only, not a performance ranking; which approach fits depends on the project design and the site.
Does it use DC or AC?
The storage concepts are described on the DC side: the panel-level concept is low-voltage DC storage distributed at the panel level, and PV-side planning starts with where storage sits in the PV and DC architecture. The published pages do not fix a conversion arrangement for every project: it is reviewed for the selected equipment and operating mode, so confirm it with the project team.
Who controls the storage units?
Control scope is defined for each project. The EMS, edge gateway and communication arrangement is reviewed as part of the system scope, together with the optimizer, BMS and protection components, and the included control functions are defined for the selected equipment; see the PV-Side Distributed Energy Storage System.
Can units be added later?
Yes, in project-defined stages. Begin with selected panels or modules and agree the conditions for adding units; modular expansion still requires an approved project design, and the phased expansion concept is not a stated capacity rating. See the Distributed PV Energy Storage Bar.
How is a faulty unit serviced?
Service is planned at component level from the start. The deployment plan includes unit identification, fault review, replacement access and service responsibilities, with the documentation needed to support the selected configuration. Request the model-specific technical documents for the components included in the supply.
Plan your module-level storage project
Review the three configurations on the Distributed Solar Energy Storage series page and the PV-side architecture on the PV-Side Distributed Energy Storage System page, then share your array layout, module and inverter models, intended storage role and first-stage scope.
Request a Quote for a project-fit review
Related reading: Distributed solar storage FAQ
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