More Nomura Testing

This page will illustrate the Nomura MPPT Testing performed on November 6th, 2022.

MPPT Efficiency Testing with Load

During this test, we tested what input voltages achieve the greatest power efficiency. We connected a digital power supply to the MPPT input and from the output we connected it to a digital load.

Input Voltage	Input Current	Input Power	Output Voltage	Output Current	Output Power	Efficiency

Input Voltage	Input Current	Input Power	Output Voltage	Output Current	Output Power	Efficiency
7	0	0	21.33	0	0	0%
7.5	0	0	23.4	0	0	0%
8	0	0	24.93	0	0	0%
8.5	0	0	26.17	0	0	0%
9	0	0	27.43	0	0	0%
9.5	0.9	8.55	32	0.25	8	93.57%
10	3.48	34.8	32	0.95	30.4	87.36%
10.5	5.57	58.485	32	1.55	49.6	84.81%
11	5.3	58.3	32	1.57	50.24	86.17%
11.5	5.15	59.225	32	1.6	51.2	86.45%
12	4.93	59.16	32	1.62	51.84	87.63%
12.5	4.75	59.375	32	1.63	52.16	87.85%
13	4.57	59.41	32	1.642	52.544	88.44%
13.5	4.39	59.265	32	1.645	52.64	88.82%
13.98	4.24	59.2752	32	1.66	53.12	89.62%
14.48	4.13	59.8024	32	1.68	53.76	89.90%
14.99	4.04	60.5596	32	1.71	54.72	90.36%
15.98	3.8	60.724	32	1.727	55.264	91.01%
16.99	3.5	59.465	32	1.715	54.88	92.29%
17.99	3.3	59.367	32	1.716	54.912	92.50%
19	3.06	58.14	32	1.693	54.176	93.18%
19.98	2.95	58.941	32	1.719	55.008	93.33%
20.98	2.83	59.3734	32	1.752	56.064	94.43%
21.99	2.75	60.4725	32	1.777	56.864	94.03%
23	2.65	60.95	32	1.8	57.6	94.50%
24	2.58	61.92	32	1.826	58.432	94.37%
24.99	2.54	63.4746	32	1.888	60.416	95.18%
25.99	2.57	66.7943	32	1.988	63.616	95.24%
26.99	2.78	75.0322	32	2.23	71.36	95.11%
27.98	3.24	90.6552	32	2.684	85.888	94.74%

extension

From the results we see that input with around 26V will give us the best power efficiency.

MPPT Efficiency Test with Batteries

For this experiment, we connected a DC power supply to a MPPT input and connected the output to 8 battery cells (rated at 4.2V each) connected in series.

Input Voltage	Input Current	Input Power	Output Voltage	Output Current	Output Power	Efficiency

Input Voltage	Input Current	Input Power	Output Voltage	Output Current	Output Power	Efficiency
0	0	0	31.1	0	0	0%
6	0	0	31.13	0	0	0%
6.5	0	0	31.13	0	0	0%
7	0.003	0.021	31.13	0.0001	0.003113	14.8238095
7.5	0.405	3.0375	31.24	0.0864	2.699136	88.8604444
8	1.44	11.52	31.5	0.3	9.45	82.03125
8.5	1.26	10.71	31.59	0.3	9.477	88.487395
9	1.2	10.8	31.64	0.31	9.8084	90.8185185
9.5	1.05	9.975	31.59	0.28	8.8452	88.6736842
10	0.98	9.8	31.61	0.29	9.1669	93.5397959
10.5	0.94	9.87	31.64	0.29	9.1756	92.964539
11	0.89	9.79	31.66	0.28	8.8648	90.5495403
11.5	0.85	9.775	31.69	0.28	8.8732	90.7744246
12	0.75	9	31.63	0.26	8.2238	91.3755556
13	0.6	7.8	31.67	0.238	7.53746	96.6341026
14	0.56	7.84	31.65	0.24	7.596	96.8877551
15	0.56	8.4	31.72	0.24	7.6128	90.6285714
16	0.5	8	31.75	0.24	7.62	95.25
17	0.51	8.67	31.78	0.25	7.945	91.6378316
18	0.52	9.36	31.8	0.27	8.586	91.7307692
19	0.55	10.45	31.84	0.3	9.552	91.4066986
20	0.55	11	31.87	0.32	10.1984	92.7127273
21	0.55	11.55	31.9	0.33	10.527	91.1428571
22	0.56	12.32	31.94	0.36	11.4984	93.3311688
23	0.62	14.26	32	0.42	13.44	94.2496494
24	0.66	15.84	32.05	0.47	15.0635	95.0978535
25	0.65	16.25	32.12	0.49	15.7388	96.8541538
26	0.74	19.24	32.22	0.58	18.6876	97.1288981
27	0.77	20.79	32.28	0.61	19.6908	94.7128427
28	0.88	24.64	32.39	0.71	22.9969	93.3315747
29	0.94	27.26	32.51	0.8	26.008	95.40719
30	0.7	21	32.38	0.61	19.7518	94.0561905

extension

For this experiment we can also see that around 26V input power, will give us the best power efficiency. It also looks like all values within the MPPT’s rated voltage (10V - 30V), provides an acceptable power efficiency.