External charging:
Charge with an unsuitable charger, e.g. one that switches off after reaching a charging voltage of 14.1 – 14.4 V, leads to severe sulphating of the battery plates and thus to battery “starvation”.

The correct charging technique:
Characteristic curve IU or IU_oU₁, i.e. “I” phase at a minimum ¹/₁₀^th of the battery capacity as the charging current (e.g. 8 A for a G 80).
After reaching the charging voltage of 14.1 – 14.4 V, switchover to the “U” phase (main charging phase) at 14.1 – 14.4 V takes place. The total charging time must be at least 12 hours, even if the battery was only slightly discharged. After that the charger can be switched off (= IU characteristic curve) or switched over to float charge (IU_oU₁).

The voltages mentioned above apply for a 12 V on-board electric system. The data is doubled for a 24 V on-board electric system.

The voltage values stated in each case are set-point values for the voltage at the battery terminals.

		Permitted charging voltage
		Generators with controllers 14.1 to 14.4 V for 12 V 28.2 to 28.8 V for 24 V
		2. Chargers (according to the data quoted above) 14.1 to 14.4 V for 12 V 28.2 to 28.8 V for 24 V
		3. Solar panels (with appropriate voltage regulators) 14.2 V constant
		4. Wind or wave generators (with appropriate voltage regulators) 14.2 V constant

• Optimum supply performance



• Cycle stability and long life



• Consistent starting performance



• Sturdy construction



• Leak-proof, permitted angle of inclination 180∞



• Minimum self-discharge



• Clean and environmentally friendly



• Absolutely maintenance-free



• Clean and safe to handle



• Very long storage times



• Versatile applications –
  from local buses to sailing boats