2004Forum Batteries/Power
Lithium-Ionen-Batteriekompatibilität und Stromversorgungsprobleme mit Arri 435 Kamera
22 Jahre alt. Geräte und Preise können sich seitdem geändert haben.
Was die Diskussion ergab
- Die ursprünglichen Arri 435- und 435-ES-Modelle zeichnen beim Start einen 18-Ampere-Spike, den Lithium-Ionen-Batterien nicht bewältigen können, während neuere 435-Modelle eine langsame Rampenoption enthalten, um dieses Problem zu beheben.
- Die Kombination einer Nicad-Batterie mit Lithium-Ionen-Batterien kann das Problem der Startspitze lösen, wobei die Nicad den anfänglichen Strombedarf abdeckt, während Lithium-Ionen die Kamera während des anhaltenden Betriebs betreiben.
- Lithium-ion batteries have higher internal resistance than nicad batteries, causing greater voltage drop under load and higher amperage draw.
- A small black button at the back of the 435 camera under the magazine port, when depressed by older Arri 3 magazines or 1000 foot mags, reduces the power spike and may improve battery performance with steadimag or 400 foot mags.
- 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.
Hängt ab von
- 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.