I can understand the desire to keep the system simple and you made a good point and such a proposal may not be for you.
The way I see it is that batteries are the single biggest expense in an off grid system, and that is the bottom line. Anything one can do to minimize this expense is to their advantage. Sodium ion batteries have the potential to offer a relatively low overall cost option for storage. They have a few shortcomings that can possibly be dealt with. It does increase some complexity to the system, but not in a big way.
Think of the LFP batteries as just there to give the sodium ion batteries a boost when needed. Otherwise they would be completely separate from the system. Of course it would be best to have the LFP battery pack on a separate charge controller, and still have a low voltage disconnect to protect from damage.
It would not be difficult to control the cut in and out of the LFP pack. Essentially, by examining the voltage and current flows from the sodium ion pack, a decision could be made. Would be a simple circuit that could be fine tuned with further logic possibly.
The way I see it is that batteries are the single biggest expense in an off grid system, and that is the bottom line. Anything one can do to minimize this expense is to their advantage. Sodium ion batteries have the potential to offer a relatively low overall cost option for storage. They have a few shortcomings that can possibly be dealt with. It does increase some complexity to the system, but not in a big way.
Think of the LFP batteries as just there to give the sodium ion batteries a boost when needed. Otherwise they would be completely separate from the system. Of course it would be best to have the LFP battery pack on a separate charge controller, and still have a low voltage disconnect to protect from damage.
It would not be difficult to control the cut in and out of the LFP pack. Essentially, by examining the voltage and current flows from the sodium ion pack, a decision could be made. Would be a simple circuit that could be fine tuned with further logic possibly.
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