{"product_id":"nasa-battery-monitor-clipper-bm-2-12vdc","title":"NASA Battery Monitor Clipper BM-2 12VDC","description":"\u003ch3\u003eFeatures\u003c\/h3\u003e \u003ch4\u003eSpecifications\u003c\/h4\u003e \u003cul\u003e \u003cli\u003eSupply voltage 8 - 16 Volts DC\u003c\/li\u003e \u003cli\u003eSupply current 1.5 milliamps\u003c\/li\u003e \u003cli\u003eBattery capacities 5 - 999 AMP Hour\u003c\/li\u003e \u003cli\u003eLoad current 199 AMPS Maximum\u003c\/li\u003e \u003cli\u003eCharge current 199 AMPS Maximum\u003c\/li\u003e \u003cli\u003eShunt Standard 50 millivolt @ 200 AMP\u003c\/li\u003e \u003c\/ul\u003e \u003ch4\u003eCables supplied:\u003c\/h4\u003e \u003cul\u003e \u003cli\u003e200 AMP shunt link to M8 Ring terminal.\u003c\/li\u003e \u003cli\u003e5 Metre from display unit to battery - fused and fitted with ring terminals for shunt fuse holder and M8 ring terminal to battery.\u003c\/li\u003e \u003c\/ul\u003e \u003ch4\u003eDisplay unit\u003c\/h4\u003e \u003cul\u003e \u003cli\u003eStandard 110mm square Clipper case. High contrast LCD backlit for night viewing.\u003c\/li\u003e \u003cli\u003eMinimum voltage visual alarm\u003c\/li\u003e \u003cli\u003eSimple operation - 4 keys to select backlight Volt\/Amp\/State of Charge screen \u003c\/li\u003e \u003cli\u003eAMP hours or Time to run.\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eHow 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 BM2 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 batter. 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.\u003c\/p\u003e \u003cp\u003eA unique feature of the BM2 is its 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 BM2 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 BM2 does all this whist consuming a meagre one and a half milliamps. It is a true battery monitor easy to install and excellent value for money.\u003c\/p\u003e \u003cp\u003e** 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?.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eIn The Box\u003c\/strong\u003e\u003c\/p\u003e \u003cp\u003eDisplay; 200 AMP shunt link to M8 Ring terminal; 5 m cable.\u003c\/p\u003e","brand":"NASA","offers":[{"title":"Default","offer_id":59814728335694,"sku":"523-BM2-12","price":99.5,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1043\/8914\/9006\/files\/523-bm2-12_1.jpg?v=1780676816","url":"https:\/\/southernyachtelectrics.store\/products\/nasa-battery-monitor-clipper-bm-2-12vdc","provider":"Southern Yacht Electrics","version":"1.0","type":"link"}