How can I ensure a reliable power supply from the built-in battery?
An important consideration is the required battery capacity—it's not advisable to choose an "approximate" capacity. In practice, skippers often opt for a lower-capacity battery when replacing batteries because the new battery no longer fits into the stowed battery box due to the varying size of the electrical installation on a small vessel. This can cause the new battery to discharge to an unacceptable depth, leading to rapid degradation and premature wear. Unless otherwise specified by the battery manufacturer, the maximum permissible depth of discharge for consumer batteries is 50%. For a consumer battery with a capacity of 100 Ah (lead-acid), only 50 Ah can be used! For LiFePo4 batteries, up to 95% of their capacity can be used. In datasheets, the final depth of charge is also referred to as "depth of discharge," or DoD for short.
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