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Default Engine run time to keep battery charged

On 2019-02-06 08:44, wrote:
A Float Charger will activate at some point when the battery charge drops below the trigger level, charge to a specific set-point, and then shut off until the next cycle.


It seems like you don't know what a float charge is. It involves
maintaining the battery terminal voltage at the correct point for the
ambient temperature with a permanently-connected charger so that the
battery neither passes an appreciable amount of charge current nor
self-discharges. The relevant type of lead-acid cells will remain
fully-charged and healthy for decades when this is done correctly, but
only if they are intended for low-discharge float service, as seen in
telco POPs and similar where they are rarely called on for service.

Starter batteries don't deserve this sort of treatment, and the chargers
you get for them don't behave in this way. There are maintenance
chargers which are intended to be permanently connected which operate in
the way you suggest, but it's not float charging.