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Jay, My logic about raising the end amps is that it would shorten the amount of time spent at gassing voltage in absorption by allowing the controller to shift to float a bit sooner. It's an idea, and I'm not sure whether it's a good one -- a compromise to reduce the time spent gassing, especially when the client is away and loads are light. What do you think? My original request was for opinions about working with higher charge rates with larger arrays and smaller banks. However, in the particular case that prompted this thread, the client has a large bank: 16 cells, 32V system, 1690 amp-hours. It's one of Windy's original systems from the early 1980s, updated over the years. It was originally based around a rebuilt Jacobs Wincharger, thus the 32V, with a dozen early French 55W Photowatt modules (all of which continue to perform like new after 30 years), and a handful of other modules added over the years. The Jake was maintained well over the decades, but when it recently failed the client chose to add more PV rather then repair it, given that we're all getting older and there's no next generation coming along to climb towers and service 50 year old birds. So I added 1.68 kw in six Solarworld 280s. I think that it's more an issue of going from a quite small array and little energy use - the clients are currently overseas - to a larger array and more time spent at gassing voltages, and changing old habits. This is still less than a C/20 charge rate. The charge controller that I added with the new array is a Midnite Classic. I did not add the Whizbang Jr. but I could. Please teach us, Jay (and other Wrenches): given the IBE 1690 A-hr FLA cells, where would you set the VPC and end of charge time/amps? Thanks, Allan Allan Sindelar On 5/21/2015 9:14 PM, jay peltz wrote:
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