Darin, The Hawker 16ah batteries weren't designed for more than a 600 amp draw. EV drag racers will draw 700-800 amps from them but for a very short time 8-10 sec. At any rate the most experienced racers don't let them get below 7.2V because as they age they will "pop" at around 7V.
But regarding your question about voltage sag. With the kind of currents you are drawing, a lead-acid battery of that size is going to sag pretty bad. Hawker and Optima batteries are the best choice for high amp, high power cyclic use. They are very stiff batteries, but what you are doing is abuse. Too many 900 amp draws and your cycle life will reduce exponentially. Keep up the good work! :-) and keep us informed of your results. I like guys that want to draw 900 amps from 16ah Hawkers... kind of like John Wayland...and... Good Luck, Rich Brown Dualin'7 NEDRA SC/E and SC/F record holder >Hi all, > >I recently got a fluke scopemeter and have an abundance >of voltage/amperage data to analyze. I'm surprised at >my voltage sag on my 48V 16ah hawker genesis pack. > >900 amp draw > 33.2 volts >after about 1 second >812 amp draw > 22.8 volts >after amp draw falls to about 300, volts come up to >about 40. > >Um, that's less than 6V per battery? What do you guys >see, or what do you guys with SVR batteries see? > > >thanks in advance, > >Darin Gilbert
