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i have been able to identify the three ic's erased in the Excel 2000watt inverter-charger. Replace the three ic's with SG3525A PWM ic. The inverter has 2* LM324. Test all Dc-DC Mosfets usually IRFZ44 you can replace with the 3205 they work fine. The H-Bridge uses the IRF740 or equivalent.
A stand alone PV system is designed in such a way that the power from the solar panels (solar panel current * number of hours the battery is charged) should be always be greater than your load requirements. this will mean the battery is charged to its full capacity and the inverter and all DC...
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