Solar panel charger that works without a battery or discharged battery


Can someone please help me? I'm looking for a solar panel charge to charge lithium 3.7V battery that works without a battery. I'm using one solar panel 6V, 12V or 24V which charges the battery and also supplies the power to the load. I need to be able to supply the power even though the battery is not connected or broken. How can I do this? 

I found LT3652 part but I dont think this can do it. Or this part LTC4015 because it states the instant on when the battery is discharged.

Or could I design a switch that turns on when battery is not present and delivers power to the system? I was thinking to use a step down to 5V which is enabled only when there is no battery.



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