X1-HYB-4.0-LV
The SolaX X1-HYB-4.0-LV single-phase hybrid inverter with 4 kW is designed for residential photovoltaic systems with low voltage (LV) storage. Equipped with 2 independent MPPTs, IP65 rating, and an EPS backup system with switching in less than 10 ms, it ensures continuity even in the event of a grid outage. It supports photovoltaic oversizing up to 200% and a maximum DC current of 16 A per string, making it compatible with high-power panels. Compatible with LFP (LiFePO4) and lead-acid batteries of various capacities.
The SolaX X1-HYB-4.0-LV is a single-phase hybrid inverter from the X1-HYB-LV series, designed to maximize self-consumption and energy independence in residential photovoltaic systems. With a nominal output power of 4 kW AC and intelligent battery charge/discharge management, it represents a complete solution for those seeking an efficient, reliable, and future-ready storage system.
Why choose a low-voltage SolaX hybrid inverter?
Low voltage (LV) hybrid inverters allow the use of LFP (LiFePO4) batteries with a lower nominal voltage compared to HV systems, simplifying installation and reducing risks. The X1-HYB-LV series is ideal for single-family residential systems, with expansion potential up to 10 units in parallel for both on-grid and off-grid operations. The integrated EPS backup system ensures continuity of power supply to priority loads within 10 milliseconds, comparable to a UPS.
X1-HYB-4.0-LV Technical Specifications
| Nominal AC Output Power | 4,000 W |
| Number of MPPTs | 2 (independent) |
| Strings per MPPT | 1 |
| Maximum DC Voltage | 550 V |
| Max DC Input Current per String | 16 A |
| PV Oversizing | 200% (PV input up to 150%) |
| Max Battery Charge/Discharge Current | 120 A |
| Compatible Battery Type | LFP (LiFePO4), Lead-acid |
| EPS (Backup) Switchover Time | < 10 ms |
| Max EPS Output | 200% for 10 seconds |
| Protection Rating | IP65 |
| Dimensions | 397 × 490 × 201 mm |
| Weight | 16.5 kg |
| Shadow Tracking Function | Integrated |
| Operating Modes | Auto, Time-of-Use, Backup, Feed-in Priority |
| Display | Color LCD |
| Integrated SPD | Type 3 AC and DC side |
| Parallel Compatibility | Up to 10 units (on-grid and off-grid) |
| Generator Compatibility | Yes |
| Optional AFCI | Yes (arc fault protection) |
| Warranty | 5 years (extendable) |
Operating Modes and Intelligent Management
The X1-HYB-4.0-LV supports various programmable operating modes: Auto (maximum self-consumption), Time-of-Use (optimization based on hourly tariffs), Backup (energy reserve for emergencies), and Feed-in Priority (export to the grid). Intelligent load management allows you to optimize household consumption, for example by scheduling heat pumps or appliances when photovoltaic production is abundant. The inverter is compatible with VPP (Virtual Power Plant) systems to participate in distributed storage programs.
Installation and Compatibility
Wall mounting of the X1-HYB-4.0-LV is simplified thanks to its compact design (only 16.5 kg) and pre-wired connectors. The AC connectors (GRID, EPS, GEN) feature an orange tab safety release. The battery connector is low voltage, compatible with SolaX Triple Power LFP batteries and with other manufacturers' low-voltage batteries. Remote monitoring is available via the WiFi/LAN module (Pocket WiFi or Pocket LAN, sold separately).
Frequently Asked Questions
What is the difference between the X1-HYB-4.0-LV and the G4 version (X1-HYBRID-4.0-D)?
The X1-HYB-4.0-LV is the low voltage (LV) version optimized for low-voltage LFP batteries such as the SolaX Triple Power, with charge/discharge current up to 120 A. The G4 version (X1-HYBRID-D) is the next generation with a maximum DC voltage of 600V and interface updates. Both are single-phase 4 kW hybrids with EPS function, but the LV is ideal for those who already have or want to pair low-voltage LFP batteries at more affordable prices.
Does the X1-HYB-4.0-LV work without a connected battery?
Yes, the inverter can operate in photovoltaic-only mode (without a battery), feeding the produced energy into the grid. The battery can be added later without any intervention on the inverter: simply connect it to the dedicated DC bus and configure it via the BMS menu. This flexibility makes the X1-HYB-LV ideal for evolving systems.
Which batteries are compatible with the X1-HYB-4.0-LV?
The inverter is compatible with SolaX Triple Power LFP low-voltage batteries (e.g., T-BAT-5.8 or LD53) and with third-party low-voltage LFP (LiFePO4) and lead-acid batteries, as long as they communicate via BMS. In the inverter's BMS menu, you can select the battery type ("Lithium-Ion" → "Solax-LV" or another compatible brand) and set the charge/discharge parameters according to the manufacturer's specifications.
Does the EPS backup of the X1-HYB-4.0-LV power the whole house?
The EPS (Emergency Power Supply) backup of the X1-HYB-4.0-LV powers a circuit dedicated to priority loads (lights, refrigerator, router, specific outlets) separate from the main panel. The switchover occurs in less than 10 ms, a speed equivalent to a UPS. The power deliverable in EPS is up to 200% of the nominal power for 10 seconds (peak for motor startup) and 4 kW continuous, limited by the capacity of the connected battery. It is not designed to power three-phase loads or large air conditioning systems.
Is a bidirectional meter required to install the X1-HYB-4.0-LV?
Yes, as with any grid-connected inverter, a bidirectional meter provided by the local distributor (e.g., E-Distribuzione) is required to measure the energy fed into the grid. The inverter uses an external current transformer (CT) to measure energy flow and control grid feed-in. The CT must be installed on the grid cable (GRID) to enable zero injection function or optimal self-consumption management.
