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Chris, you might try using a clamp-on type VA meter to see how much current is leaving the battery…You must make sure that the meter is ‘d.c. capable’ and note the correct pos (+) and neg (-) orientation symbols on the meters clamp…

I would normally suggest to be aware that this time of year solar harvest is reduced, but a 50% loss with only minimal usage sounds a bit unusual…Not sure if this applies, but this can sometimes happen if you have an inverter quietly idling while set to the ‘standby mode’…Or the battery may have lost capacity due to improper charging or too extreme DOD (depth of discharge) – just saying.

FWIW, Here’s a brief primer on d.c. clamp-on VA meter techniques:

Good Luck