Stable chemistry, watched by a Smart BMS
NexisVolt packs use lithium iron phosphate cells and a multi-layer battery-management system. Here's how that works, and how we test it before making a claim.
What LFP is, in plain language
LFP stands for lithium iron phosphate (chemically, LiFePO₄). It’s a type of lithium-ion battery. The part that stores and releases energy, the cathode, is built from iron and phosphate rather than nickel and cobalt.
That choice matters. The iron-phosphate structure is chemically stable and holds together well as the battery charges and discharges. Compared with other lithium chemistries, LFP is more tolerant of heat and less prone to thermal runaway, which is why it has become the common choice for home and stationary storage.
LFP also has a flat discharge curve (the voltage stays roughly steady for most of the discharge) and it tolerates sitting at a partial state of charge without damage. Both are useful for backup duty, where a battery may sit full for days and then discharge in one long outage.
Product-specific figures (cycle life, usable depth of discharge, charging time) are under engineering validation and are not published here until approved.
How it compares with a tubular battery
Only points we can support are shown. Anything that needs a measured product figure is flagged as still being confirmed, not stated as a number.
| Comparison point | NexisVolt LFP | Tubular lead-acid |
|---|---|---|
| Chemistry | Lithium iron phosphate (LiFePO₄), a stable cathode with no cobalt. | Lead plates in sulphuric-acid electrolyte. |
| Usable depth of discharge | Designed for a deep usable range each cycle. | Repeated deep discharge shortens life; a large reserve is left unused. |
| Cycle life | Many more charge/discharge cycles for the same duty (exact product figures to be confirmed). | Fewer cycles; capacity fades faster with deep cycling. |
| Maintenance | Sealed pack; no water top-up. | Flooded tubular types need periodic distilled-water top-up. |
| Weight | Lighter for the same usable energy. | Heavier for the same usable energy. |
| Management | Electronic BMS monitors and protects every cell. | No cell-level electronics. |
What the battery-management system does
The BMS is the electronics layer that sits with the cells and protects them continuously.
Voltage protection
Cuts off charge on over-voltage and discharge on under-voltage, per cell and for the pack.
Current protection
Limits continuous current and trips on short circuit within milliseconds.
Temperature protection
Blocks charging below freezing and de-rates or disconnects when the pack runs hot.
Cell balancing
Equalises cell voltages during charge so the weakest cell doesn't cap pack capacity.
Reverse-polarity protection
Guards against incorrect terminal connection during installation.
State reporting
Reports state of charge and fault conditions; communication options are still being finalised.
From supplier qualification to a serial number
Every pack follows the same path. A compatibility or performance claim is only published once the validation step behind it is complete.
- 01
Supplier qualification
Cell and component suppliers are assessed on quality systems, grade, test data and consistency before they enter the bill of materials.
- 02
Pack engineering
Mechanical, thermal and electrical design of the pack around real Indian inverter and 24 V solar systems, not a generic module rebadged.
- 03
Assembly
Controlled assembly with the Smart BMS, fusing and internal wiring, each unit recorded against a serial number.
- 04
End-of-line testing
Every pack goes through an electrical test, a BMS function test and an insulation check before it can ship.
- 05
Inverter validation
Packs are tested against common Indian home-inverter platforms to confirm charge profiles and cut-off behaviour before any compatibility claim is published.
- 06
Serialised traceability
The serial record links a pack to its cell batch, test results and, later, its service history.
What we can show today
Product testing, validation and applicable certification planning are currently in progress. Final certification details will be published before commercial availability.
We will list a certification here only once it has been achieved and its exact product and model scope is confirmed. No logos before then.
Certification status shown on product pages follows the same rule.