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NASA - Clipper BM-1/BM-2 Battery Monitors Model:   Select:BM-1:  £109.99BM-2:  £129.99 Manufacturer #:  NSBM1 £109.99    (Inc. UK VAT @ 20%)RRP:  £110.26Save:  £0.27 (0%)(£91.66 Exc. VAT) Add to basket Details Delivery Customer reviews (0) The BM-1 and BM-2 Nasa Battery Monitors are designed to monitor performance of 12 volt lead acid battery systems with capacities of up to 600 Amp hours. They are supplied complete with a precision 100 AMP (BM-1) or 200 AMP (BM-2) shunt and a prefabricated cable assembly to enable simple DIY installation. The units continuously monitor voltage, current (charge or discharge), number of amp/hours (charge or discharge), the batteries state of charge and the time to charge or discharge. This information leads to more efficient use of the batteries, which can enhance battery life and reduce the risk of failure. We're currently unable to show live stock information on our website, so if you need delivery fast we strongly recommend checking availability first. Simply fill out the form below and we'll get back to you, or call us on +44 (0)1243 375774 for an immediate answer. * Quantity Required: Article Number: * E-mail Address: * Please add the two numbers RequestRequest Be the first to Write a Review for this item!

Product Information

Nasa Battery Monitor - How does it work?

The minimum information required to monitor the state of charge of a battery is the terminal voltage and the charge/discharge current. The Nasa Battery Monitor measures both these parameters and computes the state of charge using a complex, well proven algorithm.

A simple and intuitive display shows the service battery voltage, charge/discharge current, state of charge, and time to charge/discharge. The instrument also warns the user when the charge level is too low so that load can be shed or charging commenced to protect the battery. A resettable Amp Hour counter is provided for checking the efficiency of the charging system or keeping a track of power consumption and a second input lets the user monitor the voltage of the starter battery. The simple display format does not mean the internal software is unsophisticated. In fact, two separate algorithms are used; one based on integrating amp hours over the charge and discharge cycle, the second based on an adaptive internal mathematical battery model.

A unique feature of the Nasa Battery Monitors is their ability to use information from both algorithms, during the charge/discharge cycles, to continually update its performance. This means that, unlike many other systems that rely solely on amp hour integration, the NASA Marine Battery Monitor never needs to be re-synchronised with the battery. The algorithm includes Peukert's equation to ensure accuracy over a wide range of load currents.

The Battery Monitor does all this whist consuming a meagre 1.5 milliamps. It is a true battery monitor, easy to install and excellent value for money.

Some say that they can calculate the state of charge from the terminal voltage only but, as we all know, the terminal voltage falls when the battery is under load and rises when under charge. This fall and rise can be quite substantial, especially when a heavy current is flowing, so how can the terminal voltage be used to calculate anything without knowledge of the magnitude of the current involved?

Nasa Clipper Battery Monitors Specifcations