2006Forum Batteries/Power
Alimentation d'une caméra ARRI 435 avec des systèmes de batterie conçus pour la basse tension
Il y a 20 ans. Le matériel et les prix ont peut-être changé depuis.
Ce que le fil a révélé
- La ARRI 435 nécessite environ 17 ampères à 28 volts pour un démarrage de 14 millisecondes à 24 fps, avec des demandes actuelles encore plus élevées pour des taux de trame plus élevés.
- L'utilisation de deux batteries NiMH ensemble pour créer une alimentation de 24 volts peut ne pas fournir une capacité de courant suffisante pour la ARRI 435, car la chimie NiMH a des limites de livraison actuelles.
- Combiner une batterie NiCad avec une batterie NiMH peut fournir une puissance plus fiable pour la ARRI 435 que combiner deux batteries NiMH du même type.
- Operating at 50 fps with a 12-to-24-volt converter powered by AB Hytron batteries is feasible if all batteries, cables, and connectors are in good condition, though testing before a shoot is recommended.
- Voltage converters designed to step up from 12 to 24 volts can struggle during camera startup due to high amperage surges, even if rated for continuous high-amp loads.
- The amperage requirement doubles through the source battery when using a voltage converter, so a 15-amp surge at the camera requires approximately 30 amps from the 12-volt battery.
- Converting a 12-volt rig to native 24 or 28 volts is preferable for modern film cameras, with a separate step-down converter available for older equipment and video work.
- The ARRI 435 can be configured on some models to ramp up to speed more slowly, which reduces amperage spikes during startup.
Dépend de
- This discussion focuses specifically on the ARRI 435 and may not apply equally to other camera models.
- Battery performance is affected by age, condition, temperature, and specific rig configuration.
- The technical specifications mentioned are based on reports from battery manufacturer representatives but were not independently verified in all scenarios discussed.
- Recommendations vary based on individual rig design and component compatibility.
- One participant achieved 90 fps with a mixed battery combination but noted that different sled designs react differently to the same battery setup.