Quote by eirebus
It's probably a good idea to disconnect your Vans from the mains or solar charging systems as continuous charging and non use can damage batteries especially ones with older charging systems, charge for a day every few weeks rather than leave on all the time
All 'decent' battery chargers are smart three-stage. There is a fourth stage called Equalisation but that's another story
Stage 1 | Bulk Charge
Stage 2 | Absorption Charge
Stage 3 | Float Charge which keeps the battery at approximately 13.5v - 13.8v
Chargers with a Stage 3 can be left continuously connected and they ensure the battery remains in a fully charged (not overcharged) condition and ready for its next use.
If the voltage climbs over 13.8v then the charger is not 'smart' three-stage or it's knackered.
After a day, or two at the most, when the battery should be definitely fully charged the input amps should have dropped to less than 1% of the battery capacity because the battery is 'full'. If the amps remain over that reading either there is a parasitic load or one or more of the cells in one of the batteries is knackered this can be confirmed if the battery feels a bit warm to the touch.
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