Electrical question

[Navatech]

A certain manufacturer sizes their chargers by 20 hour capacity but the data I have on my batteries is only 6 and 8 hour...

So, if I know that a specific battery has a 6 hour capacity of 166 ah and an 8 hour capacity of 170 ah how do I know what that battery's 20 hour capacity is?!... Is it possible to calculate the 20 hour capacity from the above data?!...

[Bruce]

Don't know how your battery manufacturer rated its batteries. While most do it at the C20 rate, not all do. If you were to see a battery rated at 100AH, it would have been tested at a 20 hour rate, unless otherwise noted. This means that the manufacturer posted the 100AH rating on the battery after testing that battery for 20 hours with an actual amperage drain of 5 amps

I'd contact the battery maker and ask them for the C 20 rate. Unfortunately the rate is not linear because if you upped the load to 15amps, the battery wouldn't last 6.6 hours but a much smaller number.