Been off grid for 5 years, the system basics include PV modules: 24 Kyocera KU265-6MCA (6.36kW); Batteries: 16 Rolls S-480 Flooded Lead Acid Battery Capacity: 750Ah; Generator: 15kW Generac EcoGen, the input and storage is 48v. The dual inverters and charge controllers are Outback with a Mate3 interface.
I equalize the batteries every three months (sometimes sooner) and check levels every month. Yesterday when checking levels before equalizing, I noticed one cell (the 43 rd I checked) did not appear to vent off any fluid over the past 30 days. All others where okay, though a few might have been lower than I would have expected, but this could have just been they were not quite as full from when I added distiller water 30 days ago. After equalizing, I noticed that the fluid level in the 43 cell was appeared unchanged.
A closer inspection inside the cell revealed the electrolyte to be brownish, like there was rust in the cell. The plates also look to has some corrosive build up that is rust in color.
Still, the system overall is performing with in anticipated parameters. So I do not want to replace the entire battery bank. Any suggestion?
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