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I would invest in jumper cables before a PV charger. When your battery is dead, you want to start it immediately, not 8 hours from now assuming it dies during the day in the sun. That said, using one to maintain the battery of a vehicle that sits is a good use.
If your battery is still weak despite PV "maintaining" it, then you need a higher output PV. The battery will eventually fail from discharging so low.
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