Nissan Leaf + SolaX X1 / X3 Hybrid Integration

Reusing a Nissan Leaf HV pack as a whole unit (~360 V nominal) with a SolaX X1 Hybrid G4 HV single-phase or X3 Hybrid G4 HV three-phase inverter. This guide covers the standard whole-pack integration.

Short answer. A Nissan Leaf HV pack used as a complete unit sits around 360 V nominal (~280–400 V over full SoC). This fits the SolaX X1 Hybrid G4 HV single-phase window of 90–500 V and the X3 Hybrid G4 HV three-phase window of 90–800 V. The BMS-EV controller emulates Pylontech HV on the SolaX BMS-CAN port. The older 48 V modular integration (open modules from 24 kWh Leaf) is a different, non-standard approach and is not covered here.

What works

Nissan Leaf 40 kWh (2018+ ZE1) — most common on the used market.
Nissan Leaf 62 kWh (Leaf e+, 2019+) — same voltage class, higher capacity.
Nissan Leaf 30 kWh (2016–2017 ZE0 mid-life) — usable but declining availability.
SolaX X1 Hybrid G4 HV single-phase (90–500 V DC, 5.0–7.5 kW).
SolaX X3 Hybrid G4 HV three-phase (90–800 V DC, 5–15 kW).
Full SoC / pack voltage / current / temperature telemetry to SolaX Cloud.

Supported inverter models

Inverter	DC input range	Power	Phase	Notes
SolaX X1 Hybrid G4 HV 5.0	90–500 V	5.0 kW	Single-phase	Leaf whole pack fits
SolaX X1 Hybrid G4 HV 6.0	90–500 V	6.0 kW	Single-phase	Leaf whole pack fits
SolaX X1 Hybrid G4 HV 7.5	90–500 V	7.5 kW	Single-phase	Leaf whole pack fits
SolaX X3 Hybrid G4 HV 5.0	90–800 V	5.0 kW	Three-phase	Leaf whole pack fits
SolaX X3 Hybrid G4 HV 8.0	90–800 V	8.0 kW	Three-phase	Leaf whole pack fits
SolaX X3 Hybrid G4 HV 10.0	90–800 V	10.0 kW	Three-phase	Leaf whole pack fits
SolaX X3 Hybrid G4 HV 15.0	90–800 V	15.0 kW	Three-phase	Leaf whole pack fits

Battery voltage range match

Nissan Leaf whole-pack HV voltages (96s configuration):

SoC	Voltage (approx.)
0% (cutoff)	~280 V
20%	~330 V
50% (nominal)	~360 V
100%	~400 V

The full Leaf HV range fits both SolaX windows. On the single-phase X1 Hybrid G4 HV (90–500 V), Leaf's peak of ~400 V leaves 100 V of ceiling headroom.

Legacy 48 V modular integration — not standard

You may find references online to integrating individual Nissan Leaf modules (~7.6 V nominal, ~2 kWh each) as a modular 48 V bank with SolaX X1 Hybrid legacy 48 V inverters. This approach:

Applies only to the older 24 kWh Leaf (ZE0) with open, single-piece modules.
Requires disassembling the pack and building a custom module carrier.
Requires a third-party low-voltage BMS (Leaf modules do not natively speak 48 V protocols).
Is NOT the standard BMS-EV integration and is not covered by the BMS-EV Nissan Leaf controller.

The BMS-EV controller for Nissan Leaf implements the whole-pack HV integration described above, keeping the factory Leaf BMS (LBC) intact.

CAN protocol mapping

SolaX X-Hybrid G4 HV accepts Pylontech HV protocol on the BMS-CAN port at 500 kbps. BMS-EV emulates this:

SoC (0–100%) from Leaf LBC → Pylontech HV SoC field.
Pack voltage, current → Pylontech HV voltage/current frames.
Charge/discharge limits from Leaf BMS → Pylontech limit frames.
Cell voltage min/max → Pylontech min/max frame.
Temperature min/max from module thermistors → Pylontech temperature frame.

SolaX menu: battery type Pylontech HV or T-BAT-H.

Wiring architecture

┌─────────────────┐ ┌──────────────┐ ┌──────────────────┐ │ Nissan Leaf │ │ BMS-EV │ │ SolaX X1 / X3 │ │ HV pack │ │ Controller │ │ Hybrid G4 HV │ │ (280-400 V) │ │ │ │ │ │ │ CAN │ Protocol │ CAN │ │ │ Leaf LBC kept │─────►│ translator │─────►│ BMS-CAN port │ │ │ 500k │ Pylontech HV│ 500k │ │ └────┬────────┬───┘ └──────────────┘ └────┬─────────┬───┘ │ HV+ │ HV- │ BAT+ │ BAT- └────────┴─────────────────────────────────────┘─────────┘

Installation requirements

Engineering values below are examples. Final conductor cross-section and protective-device sizing must be calculated for the actual pack, maximum current, cable length, installation method, ambient temperature and applicable local standards (IEC 60364-7-712, VDE-AR-N 4105, NEC 690).

HV cabling: 25 mm² copper for 5–10 kW inverters.
Contactors: Reuse Leaf factory contactors and precharge resistor inside the LBC-controlled Junction Box.
DC fuse: 40–63 A gPV between pack and inverter.
Communication: Shielded twisted-pair CAT-6 between BMS-EV controller and SolaX BMS-CAN port.
12 V supply: Nissan LBC requires 12 V keep-alive; BMS-EV provides this from the inverter aux output or a small standalone PSU.
Cooling: Nissan Leaf 40/62 kWh packs are passively cooled — no coolant loop is required, but avoid mounting in enclosed spaces above 35 °C ambient during summer.

Known limitations

Leaf 40 kWh packs are known for accelerated fade in warm climates due to the absence of active thermal management. Verify SoH before purchase; below 70% consider passing.
Leaf LBC firmware versions vary between production years. BMS-EV auto-detects but a manual firmware profile selection may be needed for early 2018 40 kWh packs.
SolaX Cloud shows aggregated SoC and pack V/I; per-cell data lives in the BMS-EV web UI.
Nissan Leaf packs are known for "rapidgate" — reduced charging power at high temperatures. In stationary use with low C-rates this is a non-issue.
ZE0 24 kWh packs (2011–2015) are declining in usable capacity and are not recommended for new installations.

FAQ

Which Leaf pack is best for solar storage?

The 40 kWh (ZE1, 2018+) offers the best combination of price, availability and usable capacity. The 62 kWh Leaf e+ is a step up in energy but at 1.7–2x the cost.

Can I use modules alone, or must I use the whole pack?

The BMS-EV Nissan Leaf controller uses the whole HV pack with the factory LBC intact. Module-level 48 V integrations are a different DIY approach that BMS-EV does not currently support.

What SoH is acceptable?

75–90% for a good used pack. Below 70% you lose enough usable capacity that the €/kWh economics stop making sense against a new LFP battery.

Does the Leaf pack need cooling in stationary use?

Not actively. Passive convection at low C-rates (≤0.3C) keeps cells within safe temperature. Avoid direct sunlight and unventilated enclosures.

Do I need a LeafSpy or Nissan Consult tool?

Only recommended before purchase to verify pack SoH and cell balance. Not needed for operation — BMS-EV emulates the vehicle-side messages.

Which SolaX inverter for a single Leaf 40 kWh?

SolaX X1 Hybrid G4 HV 5.0 or 6.0 kW single-phase is well matched — up to 6 kW peak charge/discharge, plenty for a 40 kWh pack.

Does the pack contactor click loudly?

The Leaf junction box contactor makes an audible click at wake-up and shutdown. If installed near living space, plan enclosure placement accordingly.

Order a Nissan Leaf + SolaX BMS-EV controller

Pre-configured Pylontech HV firmware

→

Last updated: 2026-09-18

Current firmware: 15.0.14

Technical author: BMS-EV engineering team (Clima Boost sp. z o.o., Poland)

Reviewer: Jakub Lipiński, founder/lead engineer BMS-EV

Revision: 2026-09-18 — aligned with firmware 15.0.14, SOFAR 180–800 V DC verification, Kia EV6 + SOFAR HYD 15KTL case study reference