SKU: 80616978392

NASA Battery Monitor Clipper BM-2 12VDC

Sale price$121.50 Regular price$135.00
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Description

NASA Battery Monitor Clipper BM-2 12VDCFeatures Specifications Supply voltage 8 16 Volts DC Supply current 1. 5 milliamps Battery capacities 5 999 AMP Hour Load current 199 AMPS Maximum Charge current 199 AMPS Maximum Shunt Standard 50 millivolt @ 200 AMP Cables supplied: 200 AMP shunt link to M8 Ring terminal. 5 Metre from display unit to battery fused and fitted with ring terminals for shunt fuse holder and M8 ring terminal to battery. Display unit Standard 110mm square Clipper case.

Features

Specifications

  • Supply voltage 8 - 16 Volts DC
  • Supply current 1.5 milliamps
  • Battery capacities 5 - 999 AMP Hour
  • Load current 199 AMPS Maximum
  • Charge current 199 AMPS Maximum
  • Shunt Standard 50 millivolt @ 200 AMP

Cables supplied:

  • 200 AMP shunt link to M8 Ring terminal.
  • 5 Metre from display unit to battery - fused and fitted with ring terminals for shunt fuse holder and M8 ring terminal to battery.

Display unit

  • Standard 110mm square Clipper case. High contrast LCD backlit for night viewing.
  • Minimum voltage visual alarm
  • Simple operation - 4 keys to select backlight Volt/Amp/State of Charge screen
  • AMP hours or Time to run.

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 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.

A 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.

** 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?.

In The Box

Display; 200 AMP shunt link to M8 Ring terminal; 5 m cable.

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
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Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 80616978392

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kathy rozanski
Boise, US
★★★★★ 5
RayBans
Color: Black/Dark Grey, Lens Width: 65 Millimeters
Always lived RayBans....order the same kind everytime I need new ones
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 12, 2026
M
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Mindy S.
Dallas, US
★★★★★ 3
Not exactly as described
Color: Havana/Brown Gradient, Lens Width: 65 Millimeters
These run large. Was not expecting that.
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Reviewed in the United States on February 14, 2026
A
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ASRC
New York, US
★★★★★ 5
For your big head instead.
I bought these in anticipation of my upcoming lasik procedure. These things look great and the seller even included a cleaning kit in box. As someone who is 6'3" with a larger head, these sunglasses are snug without being uncomfortable. I actually love that since my current prescription sunglasses are so loose on my head that they can fall off during light activity or when I sweat. Now that I have my pick of the litter with sunglasses, I could not be happier with the money I spent on these and the quality that comes with them.
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Reviewed in the United States on February 19, 2026
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marie english
Lexington, US
★★★★★ 5
Great glasses
Color: Black/Dark Grey, Lens Width: 65 Millimeters
Love them. Fit perfectly. Most important, it really blocks the strong sun rays.
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Reviewed in the United States on May 26, 2026
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Larry G
Natrona Heights, US
★★★★★ 5
TOM CRUISE, EAT YOUR HEART OUT.
Color: Black/Dark Green Polarized, Lens Width: 65 Millimeters
Superb product, delivered on time. (NOTE TO SELF: Get the polarized version next time)
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Reviewed in the United States on June 2, 2026

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