![]() Please note that this product has no fast charge / boost ability but simply mirrors the input voltage with a small voltage drop (depending on the current flow), the final charge voltage would be around 0.2 volts lower than the primary charge voltage, more than enough to keep a battery topped up and supply any small loads such as the battery internal discharge and the engine management system discharge (up to about 1 amp continuous). This unit is activated when the main battery has reached about 13.3 volts and allows excess power to be transferred from the primary charging system to charge/maintain an auxiliary battery bank. Relays also have a limited life cycle and on low power generation a relay could be clicking on and off all day, however with a FET control system does not have any physical contacts to wear out and no noise produced. Also the maintainer is current limiting so the high load on starting would not affect it. The battery maintainer uses FETs instead or relays and as such uses very little power itself (less than 1.5 ma) and so the power generated for example in a solar cell ) can be passed through with little loss. Why use this product instead of a voltage sensitive relay?Ī voltage sensitive relay is great where a large current flow is required, but it takes a relatively large amount of power to hold in a relay, this is power you cannot afford if you are only producing low current, also if the other battery you are charging is a engine battery then the starting current that will be present on engine start up will cause problems through the relay unless its current limiting. The auxiliary battery charger maintainer is simple to install, low cost product designed to enable extra battery banks on a boat or a camper van to be kept topped up from a separate battery bank which has, for example, a battery charger / wind gen/ solar cell connected to it. A flat battery means you need an expensive replacement. Save money on batteries and stop them from being destroyed by discharging.
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