59 lines
2.8 KiB
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59 lines
2.8 KiB
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.. highlight:: none
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-----------------
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Auxiliary Charger
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-----------------
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The **Elips 2000W** (as the name says) does only charge with ~2 kW, thus needing 3-3.5 hours to
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charge the original Twizy battery. That‘s quite slow and gets worse when `replacing the battery by
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a larger one <https://github.com/dexterbg/Twizy-Virtual-BMS>`_.
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The Elips is running a special Renault firmware and also taking a crucial role in the Twizy system
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communication, for example to control the BMS. So it cannot easily be replaced by a third
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party charger.
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But a **third party charger can run in parallel** to the Elips to boost the charge power. This can
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be done best from the "rear end", i.e. using the battery main connector as the power input (like
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the SEVCON does during regenerative braking).
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**Some documented examples of additional chargers:**
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- https://www.twizy-forum.de/werkstatt-twizy/84935-twizy-schnelllader
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- https://www.twizy-forum.de/projekte-twizy/83603-schnell-lader-extern
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- https://www.twizy-forum.de/tipps-und-tricks-twizy/80814-twizy-schnellladen-die-wave-kann-kommen
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**The caveat:** to avoid damaging the battery, additional charge power should not be supplied when
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the battery is nearly full. So the additional charger needs to be switched off before the main
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charger finishes.
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The OVMS can **automate** switching the additional charger both on and off. Any of the available
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EGPIO output ports (see :doc:`/userguide/egpio`) can be used for this task. If the charger has
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no digital power control input, a convenient way is to use the switched 12V supply available at the
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DA26 expansion plug without additional hardware. The 12V port can deliver a nominal output of 25W or
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1.8A, and up to 40W or 2.9A short term, so can be used to power a standard automotive relay
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directly.
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**Configuration:**
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Simply set the EGPIO to be used in config parameter ``xrt aux_charger_port``. For example, to use
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the switched 12V port = EGPIO port 1, do::
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OVMS# config set xrt aux_charger_port 1
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Set the port to 0 to disable the feature.
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**Mode of operation:**
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- The port is **switched ON** when the Twizy charges, is below 94% SOC, is still within the CC
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phase (i.e. not topping off / balancing), and the charge current is not under user control.
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- The port is **switched OFF** when the Twizy stops charging, reaches 94% SOC or enters the
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topping off phase (whichever comes first), or when you set a custom charge current.
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**Charge current control:**
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If you set the **charge current** to level 7 (35 A), only the original charger will run, but at
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full power. You can set levels 6…1 (30…5 A) to reduce the charge power, only using the Elips
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charger. Setting the current to level 0 (no charge throttling) will allow maximum charge current
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from the Elips charger and additionally enable the second charger.
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