> ## Documentation Index
> Fetch the complete documentation index at: https://learning.kent.co.in/llms.txt
> Use this file to discover all available pages before exploring further.

# Battery Not Charging or Discharging: Built-In Limits

> Bank current ceilings by model, platform SOC thresholds that park the battery by design, dormant wake-up procedures, and temperature protection behaviour.

Most "battery not working" calls are a healthy system obeying its own design. Work through the built-in reasons here before assuming a fault — the platform settings pages and the fault-finding flows then start from the right place.

## The bank's own current limits

Every Kent Lithium Battery model has a hard charge and discharge ceiling. The bank's total capacity scales with pack count — adding packs multiplies current proportionally.

| Battery model | Max charge current | Max discharge current |
| ------------- | ------------------ | --------------------- |
| F1-5120       | 50 A               | 60 A                  |
| F1-11780      | 115 A              | 138 A                 |
| F1-16080      | 157 A              | 188 A                 |

A bank below the minimum-pack matrix for its inverter will run at BMS-limited current with no fault code shown — just less power in both directions. That is by design. The fix is either increasing pack count or setting the inverter's max charge and discharge currents to match the bank's real capability.

## Thresholds that stop charge or discharge by design

Both platforms use SOC thresholds to protect the battery. The parameter names are platform-specific — never carry settings from one platform to the other.

<CardGroup cols={2}>
  <Card title="Kent M1" icon="battery-half">
    **Shutdown / Warn / Restart SOC** govern low-battery behaviour. Grid charging is **disabled by default** and must be deliberately enabled (with a max grid-charge current set) on outage-first sites. See Kent M1 Settings Reference for the full table.
  </Card>

  <Card title="Kent G3" icon="battery-half">
    **Battery reserve** stops on-grid discharge below its set point — the default is 80 %. **Overdischarge** and **Force-charge SOC** bound the low end. Grid charging only occurs where **Allow grid charging** is enabled. See Kent G3 Settings Reference for the full table.
  </Card>
</CardGroup>

**TOU windows** govern timing on both platforms — a battery instructed to idle until 22:00 will sit idle until 22:00. TOU slot logic and time formats differ between platforms.

<Note>
  **Kent G3 ECO function:** when PV is below 100 W and SOC is below the overdischarge setpoint, the inverter draws standby power from the **grid instead of the battery**. This is a protective behaviour built into the platform, not a fault.
</Note>

## Dormant packs and the official wake-up procedure

A deeply discharged pack drops into a dormant state and will not respond until woken. Never attempt to wake a dormant pack by jump-charging it from a bench supply or another battery.

<Steps>
  <Step title="Kent G3: Battery Wakeup switch">
    The **Battery Wakeup switch** in the professional Function Settings menu wakes a dormant battery from PV or grid and charges it back above the overdischarge setpoint. Use this switch — do not key in wake-up voltage values from manual text.
  </Step>

  <Step title="Kent M1: Activate Bat">
    **Activate Bat** provides the timed wake-up that prevents deep discharge on idle systems. Follow the Kent M1 settings guide for the correct procedure.
  </Step>
</Steps>

<Warning>
  **Pending Kent validation — do not configure in the field.** \[KNB-VAL-18] The Kent G3 manual's printed wake-up voltage range is inconsistent with the platform's battery window (a known documentation errata). Until Kent publishes the confirmed range: use the **Battery Wakeup switch only**. Leave voltage and time values at factory defaults — do not key in values from the manual text.
</Warning>

<Warning>
  **Pending Kent validation.** \[KNB-VAL-21] The Kent battery's pack-side wake procedure and front-panel indications are under confirmation with the Kent battery team. Until published here: wake a dormant bank through the inverter's official function above. If the pack still does not respond, that is a Kent battery-service case — escalate rather than improvising.
</Warning>

## Temperature protection

The battery automatically curtails charging and discharging outside its designed temperature window and resumes on its own when temperature returns to normal. On the Kent M1, the LCD displays explicit codes for over-temperature and low-temperature protection states.

Persistent temperature blocks on a correctly sited system are an escalation — not a settings problem to hunt.

## Common mistakes

<AccordionGroup>
  <Accordion title="Quoting a one-pack system as 'full power' when the pairing matrix requires two">
    A single-pack bank is BMS-current-limited. Check the minimum-pack matrix on the platform battery-wiring pages before quoting.
  </Accordion>

  <Accordion title="Leaving Kent M1 grid-charge at its default (off) on a backup-first site">
    The battery will be empty when the first grid outage arrives. Grid charging must be deliberately enabled on outage-first systems.
  </Accordion>

  <Accordion title="Reading Kent G3 reserve behaviour as a fault">
    On-grid discharge stops at the Battery Reserve setpoint — 80 % by default. The battery is working correctly. Adjust the setpoint if a lower reserve is required.
  </Accordion>

  <Accordion title="Waking dormant packs with improvised chargers">
    A bench supply or a jump from another battery bypasses the BMS protection logic. Use only the platform's official wake function.
  </Accordion>
</AccordionGroup>

## Related pages

* [SOC Mismatch](/battery/soc-mismatch)
* [BMS Comms Basics](/battery/bms-comms-basics)
* [Kent M1 Settings Reference](/m1/settings-reference)
* [Kent G3 Settings Reference](/g3/settings-reference)