Portable Strobe Battery Pack.

Hi Eric, The inverter would more than likely be fine, as a little extra headroom would avoid thermal shut down.

The sealed battery would have to be trial and error I think..Due to flash and inverter running off the battery.
Perhaps a 12AH to start and do some testing on how long it lasts.

However, my concern would be using it in sync with an expensive camera. These inverters are not pure sine wave and interfere with delicate electronics.
I wouldn't trust what it says about 'laptops, cameras etc.

Just my two cents worth.
Martin.

 

The inverter is overkill, and that will cost you efficiency and battery time. Do you need to power the modeling light when on battery power? If not, a 400-500 W inverter should be plenty. Let's whip out a coctail napkin and run some numbers.

900 W-s total energy over a 3 second cycle time is 300 W for three seconds. At 75% efficiency, the battery has to supply 400 W / 12 V = 33 A for 3 seconds for each full-power shot, plus some margin for startup transients. 3 seconds is 1/1200th of an hour, so each full power shot is 0.0275 A-h. So you need a relatively small battery with gigantic peak current capability. Peak currents can warp the plates in a SLA battery. Get a battery that can handle the peak currents and you should get plenty of shots, even with running the flash electronics and fan between shots.

ak