What battery types are compatible? Can lead‑acid and lithium be mixed?

FX-ECO series are 3 years warranty, FX-PLUS series are 5 years warranty, other Foxtech inverters are 1 year warranty

FX-ECO series and FX-PLUS are IP65, other Foxtech inverters are IP21

FOXTECH maintains a rigorous, multi-layered quality and certification framework to ensure our products meet global safety, performance, and environmental standards:

Core Corporate & Product Certifications:

ISO 9001 — Quality Management System, ensuring consistent manufacturing excellence

ISO 14001 — Environmental Management System, reflecting our commitment to sustainable production

CE Marking — European conformity for safety, health, and environmental protection

IEC 62619 / IEC 62620 — International standards for lithium battery safety and performance in industrial applications

CB Scheme — International Electrotechnical Commission certification for mutual recognition across member countries

Regional Market Compliance Support: We actively assist our distribution partners and end customers in obtaining local mandatory certifications to ensure seamless market entry:

PSI (Pre-Shipment Inspection) — for Middle Eastern and African markets

COC (Certificate of Conformity) — for import compliance in regulated jurisdictions

SON-CAP — Standards Organization of Nigeria Conformity Assessment Program

SABER — Saudi Arabia's product safety and conformity platform

Inverter Partner Certifications: When FOXTECH batteries are paired with Deye or Growatt inverters, the overall system inherits robust safety credentials:

Deye inverters carry certifications aligned with NRS 097 (South African grid safety standard), VDE-AR-N 4105 (Germany), G98/G99 (UK), and other national grid codes

Growatt inverters hold CE, VDE, UL, and multiple IEC certifications for global market compliance

System-level safety assurance: When installed according to local electrical codes and manufacturer guidelines, the combined FOXTECH battery + Deye/Growatt inverter system maintains full compliance with applicable international and regional safety standards. We provide detailed installation manuals, wiring diagrams, and pre-commissioning checklists to ensure every deployment meets the highest safety benchmarks.

Yes — FOXTECH residential lithium batteries are engineered with broad third-party compatibility as a core design principle, including seamless integration with leading inverter brands such as Deye and Growatt.

Communication Protocol Alignment:

Deye hybrid inverters (including the popular SUN-5K-SG03LP1-EU and SUN-80K-SG021HP3-EU series) are equipped with RS485 and CAN communication ports, which are the industry-standard interfaces for lithium battery BMS connectivity. FOXTECH batteries implement these exact protocols to ensure proper handshake and data exchange.

Growatt hybrid inverters (such as the SPH series for residential and commercial applications) similarly support BMS communication via both RS485 and CAN protocols, enabling full compatibility with our battery management systems.

What this enables: When paired with Deye or Growatt inverters, FOXTECH batteries deliver:

Real-time SOC (State of Charge) reporting — accurate battery level display on both inverter screens and monitoring platforms

Intelligent charge/discharge management — automatic optimization of charging currents, voltage limits, and temperature compensation

Safety interlocks — immediate system shutdown protection if abnormal voltage, current, or temperature is detected

Warranty preservation — proper BMS communication ensures the inverter operates within manufacturer-specified battery parameters, protecting your investment

Pre-configured compatibility: Our batteries ship with pre-loaded communication profiles for major inverter brands. For Deye and Growatt systems, simply select the corresponding battery type in the inverter settings menu, and the system will auto-recognize the FOXTECH BMS and establish full two-way communication. Our technical team also provides remote commissioning support to ensure flawless integration on first power-up.

Yes — our FOXTECH hybrid inverters fully support battery-less operation, providing a flexible, future-proof investment path.

How it works without a battery: During daylight hours, PV panels directly power your loads through the inverter. When solar generation exceeds demand, the surplus is exported to the utility grid. When solar is insufficient (cloudy weather or nighttime), the inverter seamlessly draws supplemental power from the grid. This operates similarly to a standard grid-tied system while preserving the future upgrade capability to add battery storage.

Ideal scenarios for battery-less start:

①Budget-conscious users who want to begin with solar generation immediately and defer battery investment to a later phase

②Grid-stable regions where backup power is not a critical priority

③Commercial clients looking to reduce daytime peak-demand charges through solar self-consumption before expanding to full energy storage

Important limitation: Without a battery, the system cannot provide backup power during a grid outage. This is because the hybrid inverter requires a battery to establish a stable voltage reference and frequency anchor in off-grid/islanding mode. The PV array alone cannot form a standalone AC microgrid without this energy buffer.

Our hybrid inverter supports multiple operating modes to match different use cases and utility setups. Choosing the best mode depends on your electricity tariff, solar generation profile, battery capacity, and whether you prioritise cost savings, self-sufficiency, or backup reliability. The main operating modes are:

1) Self-consumption (Self‑use) mode

Solar powers the loads first. Any surplus energy charges the battery. When the battery is full, only the remaining excess energy is exported to the grid.

Ideal for: High electricity prices with low to moderate feed‑in tariffs, or when you want to maximise solar self-consumption and reduce grid import costs.

2) Time‑of‑Use (TOU) optimization mode

The system prioritizes charging the battery during cheap off‑peak periods (from the grid if needed) and discharging during peak periods to offset high grid electricity charges.

Ideal for: Users with TOU pricing where grid rates vary significantly by time of day, and where solar alone cannot cover all peak loads.

3) Backup (seamless backup) mode

Battery is buffered to provide power during grid outages. Daily loads are served by a combination of solar and grid when the grid is available, while the battery remains reserved for emergencies.

Ideal for: Users who need emergency power continuity (e.g., essential circuits, medical devices) and are willing to trade some daily energy cost savings for reliability.

4) Off‑grid (islanded) mode

The system operates independently from the grid. Solar power, battery storage, and possibly a generator or other energy sources meet all loads.

Ideal for: Remote locations with no grid access or where grid reliability is unreliable and complete energy independence is desired.

5) Hybrid/Hybrid‑standby mode (automatic seamless transition)

The inverter intelligently switches between modes based on real‑time data (solar production, load demand, battery SOC, grid status) to optimize for cost, reliability, and efficiency.

Ideal for: Users who want frictionless operation without manual mode changes and who require a balanced mix of savings and reliability.

How to choose the best mode for your situation

Step 1: Assess your tariff and policy

If feed‑in tariffs are low and electricity prices are high, self‑consumption mode often yields the best overall savings.

Step 2: Analyze your load profile and solar resource

If most consumption occurs during the day when solar is strong, self‑consumption or TOU with daytime prioritization works well.

Step 3: Consider battery sizing and flexibility

Larger battery capacity enables longer backup or higher self‑consumption during cloudy periods.

Step 4: Evaluate risk tolerance and maintenance

If you must avoid outages, backup or automatic hybrid modes provide the most reliable behavior, albeit with potential higher daily costs.

Step 5: Local regulations and incentives

Check any local grid codes, safety regulations, and available incentives for energy storage and export.

FOXTECH hybrid inverters follow an intelligent “Solar First → Battery Second → Grid Last”energy management logic, optimized for maximum self-consumption and cost savings.

Here's how it works in practice:

During peak sunshine hours: Solar energy directly powers your loads first. Any surplus is intelligently routed to charge your LiFePO₄ lithium battery (via the built-in MPPT and BMS communication). If the battery is fully charged and solar generation still exceeds demand, the excess is seamlessly exported to the utility grid to generate feed-in income.

During cloudy periods or at night: When solar output drops below load demand, the inverter automatically triggers battery discharge to cover the deficit — without any interruption to your appliances.

When both solar and battery are depleted: The system instantly and seamlessly switches to grid power as the final backup, ensuring zero downtime for critical loads.

This real-time, AI-driven power flow coordination is managed through our inverter’s smart control algorithm and can be monitored via the intuitive LCD display or mobile APP. The entire process is automatic and seamless, ensuring 24/7 reliable power while minimizing your grid dependency and electricity bills. For C&I clients, this priority logic can significantly reduce peak-demand charges and improve overall energy economics.