Skip to content The Isuna OSK-SL-G2 Series is a single-phase low-voltage (48V) off-grid pure sine wave inverter, available in power ratings from 1.5kW to 6kW. Designed for residential and light commercial off-grid applications, this inverter integrates an MPPT solar charge controller and supports periodic grid/generator charging. It provides a reliable, cost-effective solution for areas with unstable grid access or no grid connection. The Isuna Series is ideal for solar home systems, rural clinics, small shops, and outdoor power supplies across Southeast Asia, Africa, South America, and the Middle East.
The Isuna series 1.5-6kW single-phase off-grid inverter delivers 97.5% max efficiency with SiC technology, supporting off-grid operation, dual battery branches, and wide grid compatibility. Below are the core technical parameters for your reference.
| Model | Isuna O1.5K-SL-G2 | Isuna O2.2K-SL-G2 | Isuna O3K-SL-G2 | Isuna O4K-SL-G2 | Isuna O5K-SL-G2 | Isuna O6K-SL-G2 |
| Rated Output Power (Off-Grid) | 1.5kW | 2.2kW | 3kW | 4kW | 5kW | 6kW |
| Max Efficiency | 97.40% | 97.40% | 97.40% | 97.40% | 97.40% | 97.40% |
| Grid Voltage Range | 176-264V | 176-264V | 176-264V | 176-264V | 176-264V | 176-264V |
| Max PV Input Power | 3750Wp | 3750Wp | 3750Wp | 7500Wp | 7500Wp | 7500Wp |
| MPPT Trackers | 1 | 1 | 1 | 1 | 1 | 1 |
| Battery Input Branches | 1 | 1 | 1 | 1 | 1 | 1 |
| Battery Voltage Range | 42-58V | 42-58V | 42-58V | 42-58V | 42-58V | 42-58V |
| Max Charge/Discharge Current | 62.5A+62.5A | 62.5A+62.5A | 62.5A+62.5A | 125A+125A | 125A+125A | 125A+125A |
| On/Off-Grid Switching Time | ≤10ms | ≤10ms | ≤10ms | ≤10ms | ≤10ms | ≤10ms |
| Protection Rating | IP20 | IP20 | IP20 | IP20 | IP20 | IP20 |
| Operating Temperature | -25℃~+60℃ | -25℃~+60℃ | -25℃~+60℃ | -25℃~+60℃ | -25℃~+60℃ | -25℃~+60℃ |
Isuna Series Single Phase Solar Inverter – Our Energy Storage Manufacturing Base NASCCLAMP’s Isuna series hybrid inverters are proudly manufactured in our state-of-the-art energy storage production facility, equipped with advanced automated production lines, precision testing equipment and a professional R&D team.We implement strict quality control throughout the entire process—from core component procurement, SiC chip assembly, to full-load aging testing—ensuring every inverter delivers high efficiency, stable off-grid switching and long-term reliable performance. Backed by our vertically integrated supply chain (including our Meizhou PV module factory), we guarantee sufficient production capacity, on-time delivery and customized solutions for global residential, commercial and industrial energy storage projects.
Custom Solar Solutions for Your Every Need
We provide clients with one-to-one professional support and one-stop solar lighting & energy storage solutions, from design to delivery and after-sales.
Backed by our professional R&D team, we keep developing innovative and patented designs. Most of our solar lights and energy storage products are independently developed and exclusive to our supply chain.
NASCCLAMP has built long-term partnerships with clients in more than 100 countries and regions worldwide. We are a trusted and stable supplier for distributors, contractors and project buyers.
As a professional source manufacturer, our modern factory supports large-scale stable production. Our supply capacity can fully meet your bulk orders, project demands and OEM&ODM requirements.
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