myenergi zappi [Overload]

Overload, code 30, is the one numbered fault where the finger points at the vehicle. myenergi define it as the EV drawing too much current, with the output switched off as a result, and the action is the standard reset, unplug the EV and press and hold the button. A Mode 3 charger like the zappi tells the car how much current it may take, through the control pilot signal, and the car’s onboard charger is supposed to stay under that figure. The zappi offers anything from 6 to 32 amps depending on mode, solar surplus and any load-limit the installer has set, and it measures what is actually flowing.

The installation manual puts a figure on the trip: the zappi opens its contactor and isolates the EV if the vehicle draws more than 125 per cent of the maximum current the zappi has communicated to it, showing Over Current! on the display, and myenergi explain the reason — if the car’s onboard charging equipment has a problem and overdraws, the zappi cannot control the charge rate as expected and it could lead to overheating or tripping the main circuit breaker. So when the car ignores the offer and pulls more, the zappi cuts it off rather than let the cable or the supply carry current they were not sized for. That makes the code useful in an unusual way. If it happens with one car and not another, or started after a car software update, the onboard charger is misbehaving and the dealer needs to know.

If it happens on a hot day in ECO mode as the zappi throttles down through low currents, some cars are slow to follow a falling limit, and a brief overshoot trips it. If it happens with a granny cable adapter or a non-compliant untethered cable, the cable is lying about its rating. What it is not is a sign the zappi is broken, unless the current the car is actually drawing is normal and the zappi still trips, which is a measurement fault to raise with myenergi.

1. 1

   Unplug the EV and press and hold the menu button to reset the unit, as published — three seconds, per the installation manual.

2. 2

   Try a charge in FAST mode. A steady 32 A offer with no throttling tells you whether the car overshoots on its own or only when the zappi is varying the current in ECO or ECO+.

3. 3

   On an untethered zappi, try a different, properly rated Type 2 cable. myenergi require a cable compliant with EN 62196 and support 13, 20 and 32 amp ratings.

4. 4

   If it follows the car and not the cable or mode, note the dates and raise it with the car’s dealer; the onboard charger is drawing more than it was told to. If it persists on every car and cable, contact myenergi.