Great thread, @PaddyGibson. One thing worth adding to what's already been said — pay close attention to the Isc (short circuit current) differences between your 200W and 400W panels before wiring...
RogerRoberts85 | 847 posts
@OllieGraham91 Classic cold weather issue, this. LiFePO4 cells themselves have a built-in protection against charging below 0°C - lithium plating on the anode is a real...
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