SMALL UPS...

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phil99 Guru Joined: 11/02/2018 Location: Australia Posts: 2398	Posted: 01:02am 16 Jun 2024         Quote   Looked up the wire tables. 0.2 sq.mm is rated at 2A with a resistance of 0.1Ω/m For a 50m run length = 100m x 0.1Ω = 10Ω per pair so 5Ω for 2 in parallel. How long is the line? 80Ω = 800m for 2 pair in||. Most VCRs power the motors briefly at startup so you are comparing apples with oranges. A better test may be a 12V 1A plug-pack with a 15Ω load. Better still, take your test rig to the site and put it between the power point and launch amp. Start with 10Ω in the 30VAC line and work your way up till it won't start. Edit. Next step is use 48V transformers. Both the current will be lower (30/48 times) and the tolerance for voltage drop will be higher (each volt drop is a smaller % of 48 than of 30). The losses are reduced to 30/48 squared = 0.390625 times those at 30V. Edited 2024-06-16 11:16 by phil99