If your start
battery is a lead acid
battery of any type I'd use a dc to dc
charger to charge it off the house bank.
Lead acid
batteries lose
power when they sit for any period of time.
On my
boat I have
solar for the house
batteries that keeps them charged year round, the dc to dc
charger keeps the starter charged as well.
Unfortunately I had to pull the
motor to
rebuild it and the
transmission last year, due to treatment schedules and other timely issues I didn't get it back in until recently. The
boat sat for a year, the house bank and starter battery were in perfect shape, fully charged and healthy.
Otherwise I'd have to drive to the marina every week to
plug in the shore cord to charges the starter battery, for
safety issues the marina unplugs the
power from
boats stored
on the hard weekly to prevent a possible fire issue.
When running, the
alternator will charge all the batteries (its a 200 amp alternator) if needed, but while stored the
solar keeps everything topped up.
Once a lead acid goes flat it'll never come completely back.
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