tesla is an example, like several Chinese products , that are DC coupled - and fitted between PV and inverter. This avoids a DC to AC charger but has potentially significant losses - solar is stored in battery before generation meter, so dc/dc losses and battery losses can reduce metered FIT payment so less money - no AC to DC stage means it cannot be mains charged (as would mess up the metered generation) so cannot access winter smart tariffs or night tariffs so significantly reduces the benefit case down to only solar consumption . This is why most European installations are AC coupled like Maslow as Europe is really a solar charge plus winter battery for peak shifting and grid service model. Though DC coupling had tax relief benefit in US and is ok in very high solar locations where purpose is only self consumption - needs a specific new inverter so generally is new install only or retrofit is more complex as replaces inverter or impacts warranty There is a BRE and BpVa paper on benefits of AC and DC coupling and also a consumer advice paper