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The Victron Inverter/Charger units draw 12 V power from a single or a bank of 12 V batteries which is inverted into clean, pure sine wave, 230 V power. Newton sell high performance, telecommunications grade batteries of the following sizes: 60 Ah – 12V – Code BB20, 101 Ah – 12V – Code BB21, 201 Ah – 12V – Code BB22