growatt made in 51.2V Batteryprismatic cells lifepo4langzeit solar 280ah 12v batterieweighted blanketSUN 5K SG03LP1 EU3.2 v 280ah lifepo4 battery3kw solar system price south africagrowatt hybrid inverter price compatible LiFePO4 Batteryзарядноdyness lithium batterieslifepo4 280ah grade bsun2000 6ktl m1