Originally Posted by PeterH
What is the word on your batteries?? Your last post said they'd been delivered so I'm been watching and hoping for an update. :-)
I've had to cancel my order for 160 Ah HiPower cells and I'm going with 130 CALBs. the CALBs might be delivered before the holidays but the HiPower weren't going to even be shipped till Feburary.
They arrived! sorry for the lack of updates, a combination of cold weather and a busy schedule has kept me from working on the project much over the past few weeks.
I ordered from CanEV which was a positive experience. Randy at CanEV was very good at communicating with me via email and letting me know when there were delays in the shipment, when they'd arrived at his business, and when to expect them at my door. That being said, I think if I was in the U.S. I would probably have ordered through CALIBPower and saved the wait times. The batteries arrived with all the hardware required (bolts, washers, connectors, etc.) and were very well packaged in two crates and strapped in groups of 5 as per my request.
I've started the process of top balancing the pack by putting all the cells in parrallel and using a small 3.7V, 10 amp charger from Chennic. Unfortunately I realized after connecting half the pack that I wouldn't have enough stock connectors to finish the job because they'd only sent me enough connectors to facilitate a series connection of the pack which is half the number needed to connect them all in parrellel. So I've been stripping out sections of 10 gauge wire to finish connecting the rest of the pack so that I can start the charging process.
Assuming the pack was shipped at half charge my little Chennic charger should take around 250 hours to charge the entire pack so just over 10 days! Actually now that I think of it, because the charger is just a simple constant voltage charger, the current will taper off over time so it'll probably take even longer....
Sounds like a long time but I can't think of a better way to safely charge 50 100aH cells in parrallel safely. Plus I'm not really in a hurry, I still have to figure out the battery box, BMS and state of charge metering. This little charger will ensure that the pack never goes over 3.7 volts, well below the 4 V limit of these thundersky cells so I think it's a good, low cost approach to top balancing these cells.
I should be finished with my wire stripping tomorrow and start the charging process so I'll post some pictures of the process.
On a more exciting note (battery charging isn't very exciting) I think I'm finally starting to get my head around the design of a reasonably priced fluid cab heater. Still in the conceptual stages but I'll post more soon.