For setting up LED or even a whole house 12V system, knowing how much is lost is critical

Here is the voltage drop for each 10 feet (about 3 metres, 3.048) of wire.
This page is intended for Peter's personal use only.
Example, if the consumer of power is 100' away from the converter providing the power, and you are drawing 50 watts (4.17 amps), and you want at maximum a 1 volt drop in line voltage you need a 10 gauge wire.

LED and controller POWER at source Watts		Wire gauge (AWG), Class K copper
		18	16	12	10	8
	Amps	Resistance (Ohms per 10' of cable, both conductors) @ 25 °C
	Amps	0.1358	0.0852	0.0336	0.0212	0.0136
20	1.67	0.226	0.142	0.056	0.035	0.023
25	2.08	0.283	0.178	0.070	0.044	0.028
30	2.50	0.340	0.213	0.084	0.053	0.034
35	2.92	0.396	0.249	0.098	0.062	0.040
40	3.33	0.453	0.284	0.112	0.071	0.045
45	3.75	0.509	0.320	0.126	0.080	0.051
50	4.17	0.566	0.355	0.140	0.088	0.057
55	4.58	0.622	0.391	0.154	0.097	0.062
60	5.00	0.679	0.426	0.168	0.106	0.068
65	5.42	0.736	0.462	0.182	0.115	0.074
70	5.83	0.792	0.497	0.196	0.124	0.079
75	6.25	0.849	0.533	0.210	0.133	0.085
80	6.67	0.905	0.568	0.224	0.141	0.091
85	7.08	0.962	0.604	0.238	0.150	0.096
90	7.50	1.019	0.639	0.252	0.159	0.102
95	7.92	1.075	0.675	0.266	0.168	0.108
100	8.33	-	0.710	0.280	0.177	0.113
105	8.75	-	0.746	0.294	0.186	0.119
110	9.17	-	0.781	0.308	0.194	0.124
115	9.58	-	0.817	0.322	0.203	0.130
120	10.00	-	0.852	0.336	0.212	0.136
125	10.42	-	-	0.350	0.221	0.141
130	10.83	-	-	0.364	0.230	0.147
135	11.25	-	-	0.378	0.239	0.153
140	11.67	-	-	0.392	0.247	0.158
145	12.08	-	-	0.406	0.256	0.164
150	12.50	-	-	0.420	0.265	0.170
155	12.92	-	-	0.434	0.274	0.175
160	13.33	-	-	0.448	0.283	0.181
165	13.75	-	-	0.462	0.292	0.187
170	14.17	-	-	0.476	0.300	0.192
175	14.58	-	-	0.490	0.309	0.198
180	15.00	-	-	0.504	0.318	0.204
185	15.42	-	-	0.518	0.327	0.209
190	15.83	-	-	0.532	0.336	0.215
195	16.25	-	-	0.546	0.345	0.221
200	16.67	-	-	0.560	0.353	0.226
205	17.08	-	-	0.574	0.362	0.232
210	17.50	-	-	0.588	0.371	0.238
215	17.92	-	-	0.602	0.380	0.243
220	18.33	-	-	0.616	0.389	0.249
225	18.75	-	-	0.630	0.398	0.255
230	19.17	-	-	0.644	0.406	0.260
235	19.58	-	-	0.658	0.415	0.266
240	20.00	-	-	0.672	0.424	0.272

note:

Why blank spots? The chart shows voltage drops for maximum of 80% of the cable's max amperage.
AIt provides voltage drops for a maximum wattage of 240 watts which is 80% of 300 watt transformer circuit rating.

12V line loss

For setting up LED or even a whole house 12V system, knowing how much is lost is critical

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