This exceptional trouble shooting device is not just a watt meter it is an All-in-one power meter, volt meter, amp-hour meter, ammeter and energy meter. It's designed for systems less than 60V and currents up to 200A (Peak). This genius device comes with Anderson connectors on both source and load end which makes it an easy fit into most high current DC set ups. It can check charge going to a battery from battery charger or alternator, solar panel output, charge controller output, health and performance of batteries, evaluate charging efficiency or measure power and energy consumption of any load device with a battery. The Watt Meter only requires a tiny 7mA draw to operate making little difference to power production during usage. Ideal for cars, boats, caravans, off-grid installations, Wind, solar installations, and so much more.