To avoid voltage drops, the 5A connections should use at least 18AWG cables (lower numbers better), as short as possible. At the converter's higher input voltage, the current (and therefore voltage drop) is proportionately less, and also less significant as a proportion of the voltage -- but cables should still be thick and short.The problem with 5V 5A negotiation might be that the connectors of these converters will drop significant voltages. If cables are present between adapter and converter, that drops more voltage as well. The voltage drop gets very worse at this 4-5A range. Special cables might make sense at very high currents.
The "negotiation" is irrelevant to the voltage loss -- given that the Pi needs 5V (within 5%) and given that its current needs are determined by its workload and peripherals, whether 5A is negotiated or not, the actual current used is the same, within the PSU's limit.
I'm not sure what you mean by "special cables". There are of course many unsuitable cables, but "thick and short" covers the needs. Also, avoid having more plugs and connectors than necessary. If you are making cables, ensure the connectors are rated for 5A.
Statistics: Posted by davidcoton — Fri Aug 23, 2024 10:50 am