Victron Orion-Tr 48/12-9A (110W) Isolated DC-DC Converter - ORI481210110 lifepo4 and the battery monitor from

and the battery monitor from Victron (BMV-712)

1 150Ah 12V GEL Battery

default 2 hours

Hybrid Photovoltaic Solar Inverter Infinisolar 15000W 48Vdc / 3 Phase - IP65 Water Proof

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Victron Orion-Tr 48/12-9A (110W) Isolated DC-DC Converter - ORI481210110 lifepo4 and the battery monitor fromThe converter steps down the voltage from a 48V battery bank to 12V, for feeding low power 12V loads up to 110Watt Remote on off The remote on off eliminates the need for a high current switch in the input wiring. The remote on off can be operated with a low power switch or by for example the engine run stop switch (see manual). Adjustable output voltage: can also be used as a battery charger For example to charge a 12 Volt starter or accessory