Batteries on Boats and Motorhomes

Batteries in boats and motorhomes play a crucial role in powering electrical consumers such as lights, refrigerators, pumps, navigation systems, and many other electronic devices. Therefore, regularly monitoring the battery's state of charge is extremely important. This helps you avoid unpleasant situations such as a dead battery at sea or while camping without access to the electrical grid.

In boats and/or motorhomes, we typically find two types of batteries. The first type is starter batteries, which are designed to start the engine, as they deliver a short but very high current. The second type is service batteries, which power your outlets, microwave, TV, etc. These batteries are usually AGM or LiFePO4.

Below, we’ll go over:

• which devices can help with this, and

• how to extend your battery’s lifespan

How to Determine the Battery's State of Charge?

1. Using a Battery Monitor

You can integrate a battery monitor into your existing electrical system. It will display:

• current (A)

• voltage (V)

• state of charge (SOC)

• remaining capacity (Ah or %)

• consumption history

In our selection, you will find high-quality Victron Energy battery monitors, which additionally display:

• time to full charge, energy consumption in watts (BMV-700 monitor)

• charge level of a second (auxiliary) battery, battery temperature, voltage measurement between two batteries in series (BMV-702 monitor)

• built-in Bluetooth interface (BMV-712 Smart monitor)

2. Using a Smart Shunt

Smart shunts from Victron Energy offer all the features of a battery monitor, but they display the values directly on your phone screen. You can connect via Bluetooth and the Victron Connect app. SmartShunt devices are an excellent alternative when minimal wiring is preferred.

You can browse our selection of battery monitors and shunts in our online store.

How to Extend Battery Life?

With the following actions, you can effectively maintain your batteries and prolong their lifespan:

• Keep the battery compartment clean and dry.

• Regularly check the battery voltage.

• Fully recharge the battery after each use using the appropriate battery charger.

• Monitor energy consumption while the battery is in use, and try to reduce consumption as much as possible.

• Store the battery at a moderate temperature, between 0 and 25°C.

Conclusion

Regular monitoring of your battery’s condition in a boat or motorhome is not just recommended – it’s essential. It helps you avoid potential problems during your travels or in the wilderness. With the use of a monitor or smart shunt, you can always know exactly how much energy you have left in your battery.