How can you calculate how many cells in series for different chemistry? What is the best voltage range? I’ll try to answer these questions in this video. Warning, it’s a bit dry.
48 volts is a nominal voltage. I think of it as the category our equipment falls into. But the batteries, inverters, and charge controllers all work in ranges of voltages. The trick is getting the most efficiency from the equipment. Choosing the right number of cells in series. Understanding your chemistry.
When I built my first powerwall I build a 12s lithium NMC battery. This was simply because the battery was easy to break into 12s modules. Later I started discovering why this configuration had some downsides.
After pouring through manuals and speaking with tech support, I found that inverters love voltages of 48v to 54v. This is the sweet spot. A lot of charge controllers have settings between 54v and 60v. If you want to make life easy, set up your battery to work with these settings.
This video shares my experiences. I make several generalizations. However, every rule has exceptions. The voltages I lay out will not work for every battery.
LTO battery pictured is thanks to Battery Hookup. Use coupon code “davidpoz” for 10% off. Affiliate link: https://www.batteryhookup.com/?rfsn=3333666.ca06e9
Tesla photos are thanks to Carel Hassink