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From playing with off grid power I have found that even batteries of the same make and model charge at differing rates and therefore require differential charging or charging in sequence. This is one of the problems that has haunted the electric vehicle world for years and in now only slowly being slowly overcome with quite complex computer controlled monitoring and charging systems. To get the best out of both batteries I would suggest charging them separately with a decent charger, or if using two batteries with solar using a reputable regulator that will provide the most suitable charge to each battery. In the ideal world each cell would be monitored but that isn't going to be happening in the leisure industry unless we get a radical shift from the existing technology of using slightly modified car batteries.
A nice bank of Lithium-ion cells with a specialised charging unit could make a massive difference to caravanning and the use of motorhomes in the future.
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'A sure cure for sea-sickness is to sit under a tree'
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Topic: 2 Batteries ?
