It has been a long time since I posted an update! All the momentum I had built up with cell testing suddenly crashed when I had to get the proper “modular design infrastructure” ready to handle more than one string of packs. Each task pushed back on a dependency that rapidly expanded the to-do list. The “mainframe” bus-bars really needed the rack system to be a bit complete, and then my battery leads needed upgrading to cope with the coming packs, and then the inverter needed to be mounted more permanently, and so on.
So it feels as though no progress has been made on the battery. However, looking back at photos from 18 months ago highlights what has changed. Last year I got a second-hand Flammable Materials storage cabinet and mounted it in place. I didn’t have feed-throughs for my battery leads and so the original string of packs was just sitting on top of the cabinet. The inverter was temporarily mounted to a palette leaned against the wall.
It seemed like the right time to put the cells aside and focus on some construction and engineering. Mounting the inverter was mostly straightforward, but there were a range of design decisions that needed to be made for the battery pack rack. It was during this process that I lowered my packs from 20 cells down to 18 – the slightly shorter packs will fit two-deep in the cabinet if I ever get to that many cells!
Here’s a little window into the things that have occupied my battery time. In fact, this installation was all completed some months ago, but the video has been languishing waiting for the simple voice-over.