trường hợp công ty về 1stess Solar Backup for Kenyan Homes: A CM Series Inverter Project
1stess Solar Backup for Kenyan Homes: A CM Series Inverter Project
| Item | Example Project Details |
|---|---|
| Customer | Daniel Mwangi, Purchasing Manager at a local solar installation company |
| Country / Location | Kenya / Nairobi |
| Brand | 1stess |
| Customer Reception & Coordination | Penny, Shenzhen First Tech Co., Ltd. |
| Application | Residential solar backup and essential power for small shops |
| Selected Product | CM3500-24S off-grid solar inverter |
| Example Order | 50 units, with optional WiFi monitoring modules |
| Shipment Route | Shenzhen, China → Mombasa, Kenya → Nairobi |
Daniel was seeking a compact residential solar inverter for customers who needed backup power for lighting, televisions, internet routers, fans, and selected refrigeration loads. His installation team wanted an integrated solution combining a pure sine wave inverter, an MPPT solar charge controller, and utility charging.
During the customer visit, Penny reviewed the intended applications, battery configuration, installation conditions, and purchasing requirements. The discussion focused on selecting an appropriate inverter for essential loads and making installation requirements clear before shipment.
The proposed solution was the 1stess CM3500-24S, a 24V off-grid inverter designed for solar and battery energy storage applications.
The proposed configuration used the following specifications from the supplied CM Series datasheet:
| Specification | CM3500-24S |
|---|---|
| Rated output power | 3500VA / 3500W |
| Battery-mode output power | 3000VA / 3000W |
| Nominal battery voltage | 24V DC |
| AC output | 220/230V AC ±5%, pure sine wave |
| Maximum PV array power | 4000W |
| Maximum PV open-circuit voltage | 500V DC |
| Maximum solar input current | 15A |
| Maximum solar charging current | 100A |
| Maximum AC charging current | 60A |
| Maximum combined charging current | 100A |
| Peak PV-to-inverter efficiency | 96% |
| Protection rating | IP21 |
| Monitoring | Optional WiFi |
| Parallel operation | Not supported |
| Lithium battery communication | Not supported |
The CM3500-24S also supports PV-triggered lithium battery activation. This function is separate from BMS communication and does not mean the inverter exchanges battery data through CAN or RS485.
The initial load list included household essentials alongside high-power appliances. Sizing the installation using only the model’s 3.5kW rating could have created unrealistic expectations because the datasheet specifies 3kW output in battery mode.
Penny coordinated a load review with the technical team. The proposed installation separated essential backup circuits from electric cooking appliances, water heaters, and other demanding loads. Refrigeration startup requirements were also included in the review.
This gave the installer a clear load plan and helped explain to end users which appliances could operate together during an outage.
The customer wanted to pair the inverter with a lithium battery energy storage system. However, the CM Series does not support lithium battery communication.
The proposed solution was to select a compatible 24V-class battery and confirm its operating voltage, charge settings, discharge capability, and BMS protection requirements with the battery supplier. Charging current would be limited according to the battery’s permitted value, rather than automatically using the inverter’s 100A maximum.
The commissioning instructions also required checking equalization settings and disabling equalization where required by the lithium battery manufacturer.
The customer’s installers needed a repeatable PV configuration for residential installations.
The technical review checked module specifications, series-string voltage, and input current against the inverter’s limits. The 500V maximum PV open-circuit voltage was treated as a limit, with temperature effects considered when checking string voltage.
The team also verified that the proposed array respected the 15A maximum solar input current and 4000W maximum PV array power. This helped avoid selecting a solar panel arrangement based on wattage alone.
Some proposed sites included utility rooms near dusty outdoor areas.
Because the inverter is IP21, the installation plan specified a dry indoor location with appropriate ventilation and access for maintenance. The detachable dust cover was included in maintenance guidance, together with periodic inspection and cleaning.
Penny emphasized the need to maintain airflow and avoid exposure to rain, splashing water, or excessive dust accumulation.
For this illustrative order, the shipment consisted of 50 CM3500-24S inverters, with optional WiFi modules packed and identified separately.
The datasheet lists a packaged size of 402 * 368 * 174mm and a gross weight of 5.25kg per inverter. For 50 units, the inverter cartons therefore represented approximately 262.5kg before additional pallets, accessories, or export protection. Final shipping weight and volume would be confirmed after packing.
The example delivery process included:
Penny coordinated packing confirmation, document review, and shipment updates with the customer and freight forwarder. Transit time and final delivery dates would be confirmed against the actual booking.
The proposed rollout began with a small group of pilot installations before wider deployment. Technical support covered PV and battery connections, grounding, output priority settings, charging parameters, and optional WiFi setup.
The handover checklist required installers to confirm essential-load operation, utility-to-battery transfer, charging behavior, and startup performance under the intended configuration. Any pilot issues would be addressed before applying the same setup to additional sites.
This example shows how 1stess can support a solar distributor or installation contractor beyond product supply. Load assessment, battery compatibility review, PV configuration, export coordination, and commissioning guidance all contribute to a more clearly defined residential solar backup solution.
For buyers sourcing an off-grid solar inverter, MPPT inverter, pure sine wave inverter, or residential battery backup system, the CM Series provides multiple power options for projects with different load and battery requirements.
Share your target market, essential-load list, PV module specifications, battery details, and order quantity with 1stess. Our team can help review the configuration and prepare a supply proposal for your residential solar energy storage or small-business backup power project.
