Garymyro, not to hijack the post but perhaps your battery brand has included a BMS with cold temp monitoring and shut down. Without that feature all the experts say do not charge below freezing. Most lithiums do have that.
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Gayle and John Devall
2017 Legacy 3720 IS and Disc brakes
1120 watts solar panels and 300 AH lithium batteries
2011 Ford f350 srw long box Lariat with B&W Patriot hitch. Residential Fridge.
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