I have an interesting situation where I want to combine a lithium battery bank with a single 12V lead acid battery. The idea is to use my larger LiFePO4 batteries to charge the lead acid battery, which would serve as a buffer for high spikes in power draw. My LiFePO4 batteries can handle up to 150A, but the lead acid battery can support 800CCA, which would be beneficial for quick bursts of power, like when using a vacuum cleaner.
While I know the lithium bank limits the total amperage available, I want to leverage the lead acid battery for those sudden spikes that exceed the lithium bank's capacity. I'm specifically looking for advice on how to manage power flow between these two battery types. Is there a DC to DC charger that can keep the lead acid battery charged during use? I'm concerned that potentially charging the lead acid at high currents while drawing power could harm the lithium bank. I appreciate any advice or insights into whether this setup is feasible!
1 Answer
Running a setup like this might not be the most efficient way to go about it, and you may encounter issues like voltage sag. It could be better to look into lithium batteries with higher C ratings to handle those spikes. Also, can you share more about your specific use case? How long do you anticipate needing 10kW? That might help narrow down options like supercapacitors that could fit your needs better.