Ordered a 30A MPPT Controller (Tracer), Bluetooth and Temperature Kit. It arrived the next day along with some sweets. They are a brilliant company. Well respected in the Camper and Motorhome communities. If you are looking for advice, they will generally reply to emails.
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Use this cable to connect a CAN-bus enabled battery, not from Victron, to a Victron system. Types B - normally for Pylontech battery applications. See the manual for details on which cable to use for which brand of batteries.