38 lines
1.8 KiB
ReStructuredText
38 lines
1.8 KiB
ReStructuredText
.. highlight:: none
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--------------------
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Auxiliary Charge Fan
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--------------------
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The builtin **Elips 2000W** charger's officially specified temperature operation range is -20..+50
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°C. This is exceeded by the Twizy easily even on moderate summer days. The charger temperature can
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easily rise above 60 °C, and this is possibly the main reason why Twizy chargers eventually die. It
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also leads to the Twizy reducing the maximum charge power available, resulting in charges taking
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much longer than usual.
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**A counter measure** can be to add an additional fan to cool the charger, and switch that fan on
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as necessary (see below). The fan can be controlled using one of the OVMS EGPIO output ports (see
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:doc:`/userguide/egpio`). The easiest way is to use the switched 12V supply available at the DA26
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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 many auxiliary fans directly.
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**To enable the auxiliary fan**, simply configure the EGPIO to be used in config parameter ``xrt
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aux_fan_port``. For example, to use the switched 12V port = EGPIO port 1, do::
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OVMS# config set xrt aux_fan_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 OVMS **continously monitors** the charger temperature. It turns on the
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fan when the charger temperature rises **above 45 °C** (>= 46 °C),
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and off when the temperature drops **below 45 °C** (<= 44 °C).
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- **After end of charge** (Twizy system switched off), the OVMS does not get temperature
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updates, so it keeps the fan running for another **5 minutes**.
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The fan control works during **charging and driving**, as during driving the charger also has to
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supply +12V by the builtin DC/DC converter (heating up the charger), and a trip may start with an
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already hot charger.
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