Only with a suitable on-board battery that is in the camper really brings joy. Promobil explains the workings, lists the advantages and disadvantages of different battery types and gives a market overview.

The onboard battery is the powerhouse of the motorhome without it you sit on the road in the dark. In everyday life we ​​all handle regular household batteries – the rechargeable batteries in the motorhome are good but in a completely different league: price, performance, maintenance, and not least the charge, they differ significantly from their little cousins ​​from the supermarket.

How large is the “battery consciousness” of the motorhome driver is revealed in an online survey by Promobil. 91 percent of the participants were able to identify exactly what type of battery you have installed in the vehicle. There are four technologies.

Starter batteries are not suitable as onboard battery
Reine starter batteries are not suitable for use as on-board batteries, because of their construction, they are not designed for a cyclic loading. The result is an early loss of memory. As board battery is deep cycle lead-acid batteries are used. Outwardly we can distinguish them only by the imprint of starter batteries. A deep cycle battery has printed a discharge duration (C) in addition to the capacity specified in ampere hours (Ah). Example: 90 Ah C20 means that 90 Ah could be removed via a discharge time of 20 hours.

The classic board batteries is the battery wet, their basic structure is similar to a starter battery. The difference is in the inner panel assembly: The plates are thicker, and therefore this type of battery for cyclic loading is suitable. Older or simple wet batteries must be maintained, which is connected with the gassing. The gases do not condense in the housing – as is the case with modern, maintenance-free wet batteries – they must be led through a hose to the outside. If so, then has to be refilled occasionally distilled water. A wet battery is the cheapest type of power supply on board and well suited for short-term provision of high currents. However, they should not be over-discharged, because it is then subject to very high wear. Good wet batteries are for moderate battery loads, for example for motorhome owners, who can usually rely on shore power.

Yellow batteries are maintenance free
In gel batteries, the electrolyte is bound in a gel, therefore they do not require external venting. Another advantage is that in a case fraction no acid can emerge. Gel batteries are maintenance-free, which means that you do not have to check the fluid level.