The Pros and Cons of Adopting an 8S FPV Drone Configuration
Posted by sheryl
from the Hobbies category at
27 Nov 2023 06:20:44 am.
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Preparing for Implementing an 8S Battery Setup
An 8S FPV drone battery relies on the number of cells in a LiPo battery, impacting its voltage output.
Obtaining an 8S LiPo Battery
These batteries are available from various sources. However, it's crucial to note that most current LiPo chargers only handle up to 6S, necessitating the purchase of an 8S-compatible charger.
Securing Suitable KV Motors
Motors with appropriate KV ratings between 1200KV to 1500KV are crucial for 8S drones. Alternatively, 6S brushless motor can function with an 8S battery at a 75% output limit, akin to operating 6S on 4S motors. Compatibility with 8S voltage necessitates an 8S-compatible FC/ESC setup.
8S-Compatible Flight Controller and ESC
An essential aspect of the setup involves having an 8S-compatible Flight Controller (FC) and Electronic Speed Controller (ESC). However, finding FC/ESC stacks that are compatible with 8S is presently limited.
Introduction to Flight Control System:
The flight control system, serving as the drone's core, connects all components except the brushless motor for drone, regulating their operations and precisely controlling the drone's flying attitude.
Overview of ESC:
The Electronic Speed Controller (ESC) manages motor speed by converting DC power into usable three-phase AC power. It acts as the intermediary between the motor and the flight control system.
Advantages of Higher Voltage
Utilizing higher voltages in FPV drones offers several benefits. Higher voltages facilitate similar power delivery at lower currents, reducing heat generation across the system. This decrease in current mitigates battery voltage depression, enhancing throttle control and response, similar to the transition from 4S to 6S for 5-inch FPV drones.
Disadvantages of Higher Voltage
Higher voltage necessitates lower KV motors to achieve the desired RPM with increased battery counts. While higher voltages offer significant benefits, they also present challenges. Motors with increased stator windings for lower KV might compromise cooling performance, albeit less notably with 8S compared to 6S.
Furthermore, only a few FPV components, such as FC and VTX, are compatible with higher voltages, requiring voltage regulators for these electronics. The limited extensive testing for 8S compatibility in most market components could elevate failure risks.
Conclusion: Not Recommended in 2023
Currently, 8S batteries are scarce and notably more expensive than 6S options. Their larger size increases drone weight, heightening the risks of crash-related damages. Limited compatibility of FPV components and potential durability concerns make 8S less feasible. Despite its potential performance advantages, concerns about readiness, cost, and compatibility outweigh its benefits. As technology advances, 8S may evolve to cater to individual needs and flight styles.
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