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ECOWORTHY-US Store via AliExpress has ECO-WORTHY 3500W 48V Pure Sine Wave Solar Inverter Charger for $374.74 – $70 when you apply promo code USDEAL70 or USAFF70 (or $60 off w/ USD1160 or JJY60S) at checkout = $304.74. Shipping is free.