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I live in NYC and do possess a Renogy 50 Watt 12 Volt Monocrystalline Solar Panel that I am using to charge a KYNG portable power station 540w (SGR-PPS500). The KYNG is at 47% and I've placed the solar panel by the living room window at my apartment. The KYNG does turn on as it detects charge coming from the panel but for the few hours of sunlight it seems to be stuck at 47% charge. Are there any suggestions or just wait for spring. Thanks.