OEM/ODM Guide
Outdoor Energy Storage Battery System Guide explains how an OEM or ODM lithium battery project moves from requirements review to samples and batch delivery. A successful custom battery pack must combine the right cells, protection circuit, wiring, connector and mechanical structure.
ASOL supports custom lithium battery projects for product brands, equipment manufacturers, system integrators and industrial device builders.
Table of Contents
1. Requirement Review
The project starts with voltage, capacity, discharge current, working temperature, available space, charging method and application details. Clear requirements reduce sample iterations and help the factory choose a realistic pack structure.
2. Solution Design
After reviewing the requirements, the engineering team defines the cell model, series/parallel arrangement, BMS/PCM rating, wire gauge, connector type, insulation method and label layout. For special products, the housing or sleeve structure can also be customized.
| Design item | Typical options |
|---|---|
| Cell format | 18650, 21700, lithium polymer, LiFePO4 or project-specific cell models. |
| Protection | PCM, smart BMS, NTC, balancing and communication functions when required. |
| Connection | JST, Molex, DC plug, XT connector, bare wire or customer-specified terminal. |
| Packaging | PVC sleeve, heat-shrink, hard case, label and export packaging. |
3. System Proposal and Technical Review
ESS projects are evaluated through a system proposal and technical review rather than sample battery supply. Confirm runtime, charging and discharge current, inverter interface, communication, enclosure fit and protection settings before production.
4. Testing and Confirmation
Testing should cover capacity, charging, discharging, aging, short-circuit protection, appearance and packaging. For export projects, UN38.3, MSDS, CE or RoHS documentation may be required depending on the market.
5. Batch Production and Delivery
After the system proposal and technical details are confirmed, ASOL can arrange batch production, final QC, labeling, packaging and shipment. Stable documentation and confirmed technical drawings help keep repeat orders consistent.
Energy Storage Battery System: Start with Usable kWh
Outdoor storage should be sized around the supported loads, backup duration, inverter voltage window and site temperature. For ESS projects, ASOL provides a requirements review and system proposal rather than a sample battery offer.
Example: 51.2V × 200Ah = 10.24kWh nominal energy before the planned operating reserve.
| System input | What to provide | Selection impact |
|---|---|---|
| Load profile | Continuous kW, startup surge and daily kWh | Determines inverter and battery current requirements. |
| Architecture | DC bus voltage, inverter model and communication needs | Determines pack voltage, BMS and CAN/RS485 matching. |
| Site conditions | Temperature, enclosure space and installation environment | Determines thermal design, IP needs and service access. |
Common ESS Selection Errors
- Sizing only kWh while overlooking inverter surge current and continuous battery current.
- Combining battery modules without confirming voltage, communication and protection compatibility.
- Leaving out ambient temperature, enclosure and installation details from the RFQ.
Frequently Asked Questions
Can ASOL customize connectors and wire harnesses?
Yes. Connector model, wire length, polarity, gauge and terminal type can be customized for the finished device.
What should be confirmed before an ESS production proposal?
Voltage, usable energy, load current, inverter interface, dimensions, communication, installation environment and target application should be confirmed first.
Can OEM branding be added?
Yes. Label, logo, packaging and selected housing details can be customized for qualified batch orders.
Send Your Battery Requirements
For project evaluation, share your target voltage, capacity, size limit, load current, connector requirement, application details and expected quantity. ASOL can review the battery architecture, BMS, communication and production plan before mass production.
