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The device below is an all in one solution. Recommended for smaller setups / when engine can be run. This is a 40kg 'silent' power supply with a 4kWh Lithium Battery, DC DC charger, 3.5kW inverter 240VAC. Solar input + all wiring / fuses built in.

Saves a lot in installation costs and can be taken from old vehicle to new, by simply unplugging.

Perfect backup power supply, too! gets you out of a sticky situation