With the completion of 95 copper bus bars, I was nearly ready to assemble the Really Big Lithium Ion Battery. There is a little process involved though. The Lithium Iron Phosphate (LiFePo) cells I was using had been in storage for a while and though new, would need a some maintenance. There would be 64 of them, arranged in 16 sets of four cells.
Continue reading →After building a wooden enclosure for the Lithium Ion Solar Battery, it was time to think about copper bus bars to connect all those cells together. This requires a little math, since the bus bars have to be big enough to handle current demand, but not too big — copper is expensive!
Continue reading →The next upgrade for our Solar Power System was a Really Big Lithium Ion Battery (RBB). When we first installed the system in 2020, I didn’t have a cost-effective solution for Lithium Ion (LiFePo4 chemistry). That came later with the acquisition of a lot of LiFePo4 cells. Since then, I’ve built two small batteries to get used to the technology; one as a portable solar generator, and a slightly larger one to power the ham shack. With those under my belt, it’s time to tackle a 48-volt battery to replace the existing lead acid batteries.
Continue reading →Previously, I wrote about Upgrading a Solar Power System and mentioned a cache of new Lithium Iron Phosphate (LiFePo4) cells. The “ThunderSky Winston” cells had come from a Segway repair operation and were new. A little looking around the ‘net revealed they were still available from GWL Group. With a capacity of 60 Amp Hours (AH) and nominal voltage of 3.3 volts, they looked useful for building a 12-volt Solar Generator.
Continue reading →Ikea makes a wonderful work light (JANSJÖ)that sells for about $13. I have several of them, and love the warm pool of light they provide on desk surfaces. Let’s convert one of them to solar power with the Altoids LED light project
Continue reading →Choosing the right solar inverter charge controller can make or break an off-grid system. This real-world project walks through sourcing a hybrid inverter, evaluating features, and navigating the challenges of overseas ordering and delivery.
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