2004منتدى Batteries/Power
تطابق بطارية الليثيوم وإيصال الطاقة مع Arri 435 كاميرا
مضى على هذا 22 سنة. قد تكون المعدات والأسعار قد تغيّرت منذ ذلك الحين.
ما توصّل إليه النقاش
- The original Arri 435 and 435 ES models draw an 18 ampere spike at startup that lithium-ion batteries cannot handle, while newer 435 models include a slow ramp option to address this issue.
- يمكن لطيور البطارية مع بطاريات الليثيوم ايون أن تحل مشكلة التوابل البدائية، مع معالجة الزناد للطلب الأولي على الطاقة بينما يدير الليثيوم الكاميرا أثناء العملية المستمرة.
- وتعاني بطاريات الليثيوم - الأيون من مقاومة داخلية أعلى من بطاريات النكيد، مما يتسبب في انخفاض أكبر في فولطية الحمولة وسحب أكبر من الأمبير.
- زر أسود صغير في مؤخرة 435 كاميرا تحت مرفأ المجلة، عندما يكتظ بمجلات عمرها Arri 3 سنة أو 1000 مغناطيس قدم، يقلل من ارتفاع القوة وقد يحسن أداء البطاريات بالبخار أو 400 مغناطيس قدم.
- Long extension cords and high-resistance sled wiring can cause voltage drops exceeding 2 volts, preventing the 435 from running properly since it requires minimum 22 volts to operate and at least 25 volts for high-speed filming up to 150 fps.
- Lithium-ion batteries can be safely wired in parallel without additional electronics, unlike nicad or nickel-metal hydride batteries which require diodes to prevent cross-discharge.
- When using parallel nicad or nickel-metal hydride batteries, diodes must be installed between cells to prevent the higher-voltage battery from discharging into the lower one, though this causes a voltage drop of 0.6 to 0.9 volts per battery.
- Lithium-ion batteries maintain consistent performance in cold weather conditions where nicad batteries experience degradation.
- During acceleration to high frame rates on the 435, voltage can drop significantly under load before stabilizing once the camera reaches operating speed.
يعتمد على
- The original solution involved specific battery models from several years ago that may no longer be available.
- Testing of lithium-ion performance was conducted without fully discharging batteries to verify behavior at 70% or 50% charge levels.
- The button depression trick for reducing power spikes was reported secondhand and had not been personally tested by the reporting party.
- Mixed results were reported when combining different battery chemistries, with one user experiencing shutdown of lithium-ion batteries in certain setups while another had success.
- The specific voltage requirements and spike characteristics may differ between individual 435 units or variants.
- Cold weather testing observations were anecdotal rather than systematic.