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Summary of Contents for NASA Marine Clipper BM1
- Page 1 DESIGNED AND MANUFACTURED IN ENGLAND BATTERY MONITOR BM-1 100% 100% CHARGE A-Hr ILLUM V&A TIME CLIPPER BATTERY MONITORS RoHS 2002/95/EC BM1 / BM2...
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Page 2: Table Of Contents
CONDITIONS. IMPORTANT BM1 / BM2 look identical but they are different Models. The Shunts and Shunt cables are NOT interchangeable. CLIPPER BM1..Load & Charge Current - 100 Amps Maximum CLIPPER BM2.. -
Page 3: Introduction
INTRODUCTION The NASA Clipper BM1/BM2 is supplied complete with display unit, current shunt (standard 50mV), and connecting cables. They are intended for operation on 12V Lead-Acid batteries with capacities between 5 and 600 Ampere-hours (Ahr). Their own current consumption is less than 1.5 mA, which is about 1 Ahr per month, less than the self-discharge rate of most Lead-Acid batteries. - Page 4 No other connection should be made to POSITIVE NEGATIVE this post TO ALL DOMESTIC TO ALL DOMESTIC LOADS & GENERATORS LOADS AND GENERATORS Cables supplied FUSE DOMESTIC Original BATTERY OR cables BATTERIES SHUNT YELLOW 5-metre ORANGE CABLE YELLOW YELLOW WHITE WHITE BLACK BLACK...
- Page 5 11 Connect short link cable to the shunt and then to the negative terminal of the battery. 12 If the starter battery voltage is to be monitored then connect the orange wire to the positive terminal of the starter battery. A 1 amp fuse close to the starter battery will aford protection if a fault occurs.
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Page 6: Battery Management Basics
BATTERY MANAGEMENT BASICS After Voltage and Current, the most useful measurement available from a battery condition monitor is the sate of charge of the battery. However. estimation of the state of charge of lead-acid batteries is never exact. The problem of making accurate estimates results from the characteristics of the cells, the electrolyte, and the history of currents drawn from (discharge) and supplied to (charge) the battery. -
Page 7: Normal Operation
The effects of cell deterioration on the available capacity are significant. If the battery is charged for long periods, gassing takes place. The gases are Hydrogen and Oxygen, derived from the water in the battery acid. Loss of this water needs to be made up by topping up the cells if possible, or by avoiding lengthy overcharges in sealed cells. -
Page 8: Switching The Backlight
The three normal modes, and the keys which activate them, are shown in Figure 2, below. 100% 100% 100% 100% 100% 100% CHARGE CHARGE CHARGE TIME TO A-Hr A-Hr A-Hr ILLUM ILLUM ILLUM V&A V&A V&A TIME TIME TIME Volts and Amps Ampere-hours Charge/discharge times Figure 2 - Operating modes... -
Page 9: Engineering
If the BM-1+ is left for long periods registering little or no charge or discharge current, the estimate of capacity may become unreliable. It is important to switch some load onto the battery for a few minutes so a reliable estimate can be calculated, and its value settles, before starting charging. -
Page 10: Questions And Answers
QUESTIONS AND ANSWERS Why is the screen of my BM1/BM2 blank? Check the wiring is correct and securely terminated. Check the fuse, and check that the battery is not completely flat. Why does my BM1/BM2 show that the number of hours remaining is high or low when a constant discharge current is flowing?. - Page 11 Do I need to disconnect my BM1/BM2 when I leave the boat for long periods? No. The BM1/BM2 is designed to be permanently connected to the battery. It is independently fused, and draws only 1.5mA from the battery. At such a low current, it would take several years to discharge a typical fully-charged marine service battery.
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Page 12: Limited Warranty
Prior to unpacking this instrument read and fully understand the installation instructions. Only proceed with the installation if you are competent to do so. Nasa Marine Ltd. will not accept any responsibility for injury or damage caused by, during or as a result of the installation of this product.
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