Description
- Supplied complete with a 100 Amp 50mV shunt and all necessary cables to connect to the main service battery.
- Monitors a 12 volt lead-acid battery or bank of batteries with a total capacity between 5 and 600 Ampere-hours (Ahr).
- Current consumption typically 2 mA.
- Monitors main battery voltage the current flowing into or out of the battery and calculates the best approximation of the state of charge and the time to charge or discharge.
- Alarm alerts if the charge gets dangerously low when load shedding or charging becomes necessary.
- Second input measures starter battery voltage.
- Information is transmitted using Low Energy Bluetooth (Bluetooth 4) viewable on any compatible device with a suitable App.
- Android App can be freely downloaded from the Nasa Marine website while a 3rd party Apple App with additional features can be found on the apple App store.
When you need a battery monitor but don’t have space for the display or routing the cables would be a nightmare there is now a solution. The BM-1(BT) will monitor your boat or Caravan’s lead-acid batteries and transmit the data directly to your mobile phone or tablet wirelessly by Bluetooth.
A simple Android app freely available from the nasamarine.com website or Google Play Store (requires Android V4.3 or later) shows your service battery voltage current flowing in or out state of charge and time to charge or discharge the battery. An audible alarm warns if the battery level gets dangerously low. It will also show the starter battery voltage. For apple users a more sophisticated app with additional features can be purchased from the Apple app store. Compatible with iPhone iPad and iPod touch. Offers Apple Watch App for iPhone. (Requires iOS 9.0 or later).
The monitor which draws a meagre 2 mA is supplied with a 100 amp shunt and a premade cable assembly to simplify connection to your service battery.
Upgrade Options
Alternative or higher-specification products you may also wish to consider.
NASA
NASA Battery Monitor Clipper BM1 12VDC
The BM-1 is designed to monitor performance of 12Volt lead acid battery systems with capacities of up to 600 Amp hours. It is supplied complete with a precision 100 AMP shunt and a prefabricated cable assembly to enable simple DIY installation. The unit continuously monitors 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 battery, which can enhance battery life and reduce the risk of failure.
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NASA Battery Monitor Clipper BM1 24 VDC
The BM-1 is designed to monitor performance of 24 Volt lead acid battery systems with capacities of up to 600 Amp hours. It is supplied complete with a precision 100 AMP shunt and a prefabricated cable assembly to enable simple DIY installation. The unit continuously monitors 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 battery, which can enhance battery life and reduce the risk of failure.
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NASA Battery Monitor Clipper BM-2 12VDC
The BM-2 is designed to monitor performance of 12 volt lead acid battery systems with capacities of up to 999 Amp hours. It is supplied complete with a precision 200 AMP shunt and a prefabricated cable assembly to enable simple DIY installation. The unit continuously monitors 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 battery, which can enhance battery life and reduce the risk of failure.
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NASA Battery Monitor BM2 Compact 12VDC 200amp
BM-2 Compact is designed especially for applications where space is at a premium. It fully monitors performance of 12 volt lead acid battery systems with capacities of up to 999 Amp hours. The package is supplied complete with a precision 200 AMP shunt and a prefabricated cable assembly to enable simple DIY installation. The unit continuously monitors 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 battery, which can enhance battery life and reduce the risk of failure.

