I don't know of any adapters to allow a battery charger to act as a maintainer. Depending on the output of your solar charger, It could be a "maintainer" Dash board solar chargers rated between 5 and 10W and 13 to 13.5v will act as a maintainer.. Maintainers typically normally output a very low amperage, generally one amp or less and a voltage between 13 and 13.5v to apply a very low charge rate to balance the internal leakage of a battery. Normal full charge voltage of a 12v leaed acid battery is between 12.5 to 12.8V

More is sometimes not good I guess....is there an adapter to convert my solar charger o "maintenance " so I don't over charge?

Thanks. Both the Eiger and Kodiak are sadly not offen for sale here in Denmark, its not like I have 3x Kodiak 400 and 3x Eiger 400 for sale at the same time. The last Kodiak 400 i found was sold very fast and was from 1998, and right now I can find a Eiger 400 for sale in my price range, thats from 2003. Has not seen many Kodiak 450 for sale, and all pretty high asking prices. But just happy to know if I get either a Kodiak or a Eiger that has been serviced I should have a machine that can do the job without problems.

The biggest killer of all forms of lead acid batteries is letting them sit without a maintainer on them, or at least bringing them to full charge at least once a month when they are not in use.. When a lead acid battery drops belo2w full charge , either from being parked when partially discharged or by normal internal leakage the lead sulfate produced can harden on the plates. When that happens a lot of the hardene4d sulfate does not break down back into lead dioxide and sulfuric acid. You don't notice the slow loss of capacity because of it unless the battery is often left at deeper discharge rates. Any lead acid battery that sits idle for long periods loses a lot of capacity over time and if allowed to drop extremely low can easily short out when thicker sulfate can flake off the plates on recharge. A battery regularly used and kept full charged when idle can last for years while one allowed to sit for long periods at less than full charge can fail in a year.. My Quad battery is about 5 years old, as is the one for my riding lawnmower. Both are on trickle charge maintainers when not in use. The AGM battery in my 2016 Traverse is likely original as I bought it used 5 years ago. I know its reserve capacity is very low now and I will likely have to replace it next winter. As I have mentioned in other threads, a good maintainer is a lot cheaper than buying a replacement battery every couple of years.