The APEX-6.5K is a split-phase off-grid hybrid inverter built to run a cabin, homestead, or remote residence on 120/240V power. It pairs with LiFePO4 battery banks, accepts solar and generator input, and passes through up to 80A for large appliances and critical circuits.
Note: If you would like to review the manufacturer Product Specifications, Warranty, Brochure, etc., for this system, please refer to the "Resources (System Manuals and Warranty)" Tab above on this page.
Why This Matters
Off-grid power systems fail as often from inverter mismatch as from battery problems. Split-phase output means you get true 120/240V service — the same standard used by residential electrical panels — rather than a stepped-down or single-leg substitute. The 80A pass-through rating tells you how much load the unit can carry straight from the grid or generator side to your panel when the inverter isn't actively generating, which matters when you're running well pumps, HVAC, or shop tools alongside everyday circuits.
Inverter Characteristics
The APEX-6.5K is designed to work with LiFePO4 battery banks. It is a hybrid inverter, meaning it manages solar charging, battery charge/discharge, and AC input switching (grid or generator) in one enclosure. The unit is rated for outdoor installation and built with a wide operating temperature range for harsh-climate deployments. [NEEDS VERIFICATION: exact operating temperature range in °F/°C not provided in source data.]
Wiring & Configuration Limits
The APEX-6.5K supports parallel connection with additional APEX-6.5K units to scale power output for larger loads. It accepts solar (PV) input, generator input, and grid input as separate connections — all three are supported simultaneously on this model.
Not for use with: Flooded lead-acid, AGM, or Gel battery banks are not addressed in the manufacturer data for this inverter — confirm chemistry compatibility before wiring any non-LiFePO4 bank. Do not treat CT metering or WiFi/RS485/CAN ports as substitutes for a dedicated battery BMS communication link — verify wiring against the manufacturer's install diagram before energizing the system.
Pro-Installer Tip
Bottom-entry wiring keeps a clean install, but it also hides mistakes — a loose PV or BAT+ lug behind a wall-mounted unit is harder to spot than one on a top-entry chassis. Before closing up the enclosure, torque every DC lug to the manufacturer's spec and re-check it after the first full charge/discharge cycle, since LiFePO4 packs under load can cause terminal connections to settle. Skipping this step leads to resistive heating at the lug, which shows up months later as a charge controller fault or, worse, a melted terminal block. Use a clamp meter on the BAT+ and BAT- leads during the first high-load test to confirm current draw matches your battery bank's rated continuous discharge before putting the system into daily service.
Key Benefits
- Split-phase 120/240V output at 50/60 Hz — runs standard residential panels and appliances.
- Pure sine-wave output for sensitive electronics and motor-driven loads.
- 80A pass-through keeps critical circuits running during bypass conditions.
- Accepts solar, generator, and grid input simultaneously on the 6.5K model.
- Parallel-capable for scaling power across multiple units.
- Bottom-entry wiring and outdoor-rated enclosure for installer-friendly, weather-exposed installs.
- WiFi, RS485/CAN, USB, and dry contact ports for monitoring and integration.
Technical Table
| Spec | APEX-6.5K |
|---|---|
| Output Voltage | Split-Phase 120/240V |
| Frequency | 50/60 Hz |
| Waveform | Pure Sine Wave |
| Pass-Through Current | 80A |
| Compatible Battery Chemistry | LiFePO4 |
| Grid Input | Yes |
| Load Output | Yes |
| Generator Input | Yes |
| PV (Solar) Input | Yes |
| Parallel Connection | Yes |
| USB | Yes |
| CT Metering | Yes |
| WiFi | Yes |
| RS485/CAN | Yes |
| Dry Contact | Yes |
| Wiring Entry | Bottom-Entry |
Note: See "Resources (System Manuals and Warranty)" Tab above for full specifications.
Compatibility & Fitment
The APEX-6.5K is built to pair with LiFePO4 battery banks, such as BigBattery's NEXUS kit, for a complete off-grid energy storage system. It accepts grid, generator, and solar (PV) inputs simultaneously — all three input types are supported on this model.
NOT included: Battery bank, solar panels, PV combiner/disconnects, and generator are not included with this inverter and must be sourced separately.
NOT compatible with / not confirmed: Non-LiFePO4 battery chemistries are not referenced in the source specifications for this unit — do not assume AGM, Gel, or flooded lead-acid compatibility without manufacturer confirmation. This is the 6.5K model; input configuration differs from the APEX-10K, which supports only one AC input (grid or generator, not both simultaneously) and does not include CT metering.
FAQ
Does the APEX-6.5K accept both solar and generator input at the same time?
Yes. The APEX-6.5K supports grid, generator, and solar (PV) input simultaneously, which is different from the APEX-10K, where a single AC input handles either grid or generator, not both at once.
What battery chemistry does the APEX-6.5K pair with?
It is designed to pair with LiFePO4 battery banks. Compatibility with other chemistries is not addressed in the manufacturer specifications.
Can I connect multiple APEX-6.5K units together?
Yes. The unit supports parallel connection for scaling output across multiple inverters.
What is the pass-through rating?
The APEX-6.5K has an 80A pass-through rating for running large appliances and critical circuits.
Does the APEX-6.5K include CT metering?
Yes, CT metering is included on the APEX-6.5K. It is not available on the APEX-10K.
Warranty & Support
Warranty terms for the APEX-6.5K are not included in the data provided for this listing. Refer to the "Resources (System Manuals and Warranty)" Tab above for manufacturer warranty documentation. If you have questions about install specifics or input configuration before you order, ask us — we always reply back.
