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Are you using lots of water for the batteries? I found my 4x6v Interstates were after 7 years of solar use and the charge went down fast during normal usage. Replaced last year with 4 Trojan T105's. Everything is working normal again.
Hope my Trojan's last as long.
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Lenny and Ros
2012 Montana 3400RL,680 Watts Solar,4xT-105 Trojans,GP-ISW2000-12 Inverter,Trimetric 2020, EMSHW50C
2009 Chevy Silverado 3500 LTZ Duramax 4x4 CC Dually, Banks Speed Brake
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