bms lifepo4 12vgrowatt inverter website 51.2V Batterydeye inverter pricegel batterie 280ahgrowatt spf 3000 es 48V Batteryбалансирдлlifepo4 аккумуляторов5kw growatt inverter price LiFePO4 Batterybaterélifepo4 12v 100ahlifepo4 li ionctechi lifepo45kw growatt 51.2V Batterylithium iron phosphate battery 200ah