My Heltec LoRa 32 v3 microReticulum node draws down a 15000 mAh power bank in a day. This might work with solar in summer here, but never in winter. Actually we need a nRF node with enough storage.

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Yeah, my thoughts too probably. But with my battery, which is much lower capacity than that, I will defs not be able to make it through the night entirely. Even after a sunny day. So I need to really start moving towards the nRF platform for nodes that don't have a large battery capacity. I have ordered the WisBlock now.