I found this https://www.youtube.com/watch?v=cBM0aUGW87Q&t=22s Idea on YouTube but is interested in extending the Idea.
What I plan to do is to Isolate the TPS4056 with a higher drive DC-DC converter. The only on I could found locally is a URB2405YMD-10WR3 with an input voltage of from 9VDC to 36VDC to an output of 5VDC and a drive of 10Watt. I could thus probably drive each individual TP4056 at the full level of 1A at 5VDC (thus 5W) and thats a safety net for the DC-DC converter.
I would also be able to charge a LiPo stack with either a Lead Acid input of 11VDC to 14.8VDC or a 36 sell PV panel (Max unloaded voltage of 21.4VDC).
If I stack up 6 LiPo cells to provide an output of approximately 24VDC (theoretically and I hope so)
It is then Isolating the Charge circuit of the LiPo's from the input charge.
My problem is to provide a stable enough charge circuit for a 6 stack LiPo cell's ( I plan to use a 6X2 stack thus six in series each with two in parallel).
Thus each stack could be charged with its own TP4056 that is Isolated from the Input (I hope).
As the planned tagged LiPo cells (Panasonic NCR18650B at 3.7VDC 3.4A/h) that do not have protection so I will have to add a BMS to limit the depletion level of each cell (I'm going to use two three cell BMS without balance as this is already done by the Induvidual 6 TP4056.)
The load will be then supplied through the two 3S BMS's in series to provide the required output of 24VDC.
This would then limit the problems with the Charge circuit for a 6 cell stack that is at least 25.2VDC (I hope)
It is very experimental at this stage but I hope it would be successful at the end for a bugout SHTF lithium stack the DIY way. Im still awaiting the components (of which the DC-DC converters is by far the most expensive) and the PCB for this components. (i'm also putting on a Polyfuse (self re-settable fuse) with I-hold of 7A and I-trip of 14A at the input side just for protection of the DC-DC converters (LP30-700 with a Vmax of 30VDC of Way-ON; also locally available))
Please help me regarding this Idea because locally available components is quite limited.