“Most flooded batteries should be charged at no more than the "C/8" rate for any sustained period. While some battery manufacturers state a higher maximum charge rate, such as C/3, higher charge rates can result in high battery temperatures and/or excessive bubbling and loss of liquid. ("C/8" is the battery capacity at the 20-hour rate divided by 8. For a 220 AH battery, this would equal 26 Amps.)“ Northern Arizona Wind & Sun https://www.solar-electric.com/learning-center/deep-cycle-battery-faq.html/#Battery%20Charging
