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Hi all - first time post here 🙂

I have a 54 Volt Blue Nova battery approximately 10 months old now.  It is controlled by a Victron Multiplus 48/5000 unit - age of installation approx 5 years.  The available energy from the battery is constantly decreasing  up to a point where it now disconnects the Multiplus while even being at 40-50% State of Charge.  This is with an approximate continuous load of around 120watt overnight.  Originally when new it could go down to below 5% SOC with such a low load, only requiring a big load for it to go into protection  (Low Battery state) while still at say 20% SOC.  

I have a full island system being on a small holding and have a generator as backup but it does not auto-start. The island setup means that the battery is fully charged every day and drained to on average about 25% SOC overnight, infrequently down to 15% and lower.  It never stays at that  SOC for longer than a few hours - it is usually charged back up to at least 50% within 90 minutes - so chances of it getting damaged through prolonged discharge is slim. I have been advised by Blue Nova to allow for Equalisation charge which it does currently once a week (and has always been set like that) - we draw very low loads in the afternoons so the battery is fully charged daily.

Does anybody else have the same experience with Lithium batteries?  If so - how does one handle this? What is the safe Equalization repeat setting for Lithium batteries - will it do any damage to the batteries if set for "Daily"?