About to install an Easysolar II gx system in my mountain cottage in Norway (-37 C this winter). My first off grid move and the fact of there being Victron is amazing. Thx!!
To make it as clear as possible: my question is NOT about charge or discharge but solely about idle storage aka long term effects of freezing electrolytes (freeze point being -30/35 C)
Neither interested in battery heating nor LTO solutions
Most LFP manufacturers define cold storage limit as: -20C
Only Victron and Mastervolt (which both use Winston cells (LYP) spec the batteries to -45C
Failed finding any real test data except one very interesting study that shows that deep freeze ( cryogenic freezing ) got no harmful effect.
This study does not address temperature-fluctuations around freeze point, and only measures short term effects. http://wrap.warwick.ac.uk/119502/13...erflash-cryogenic-freezing-Grandjean-2019.pdf.
It does match my understanding though that the electrolytes do NOT expand when it freezes (unlike water). If so any LFP battery would actually survive sub -30C temperatures ! ?
....this is a technical fringe question and I could just go with the winston/victron/lyp solution but if someone got the science/information I would really appreciate!
the best to you all, Nilo