TECHNICAL AND ECONOMIC FEASIBILITY OF OFF-GRID PHOTOVOLTAIC SYSTEMS FOR IRRIGATION

Bruning, Jhosefe; Robaina, Adroaldo D.; Peiter, Marcia X.; Chaiben Neto, Miguel; Rodrigues, Silvana A.

doi:10.1590/1809-4430-Eng.Agric.v43n3e20210168/2023

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Technical Paper • Eng. agríc. 43 (3) • 2023 • https://doi.org/10.1590/1809-4430-Eng.Agric.v43n3e20210168/2023 copy

TECHNICAL AND ECONOMIC FEASIBILITY OF OFF-GRID PHOTOVOLTAIC SYSTEMS FOR IRRIGATION

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

In rural areas, the electricity supply is affected by problems such as low quality and limited access in some regions. The use of renewable sources, with decentralized generation, can offer an alternative to the existing scenario. The objective of this work is to perform a technical and economic analysis of off-grid photovoltaic systems, without energy storage, intended for irrigation. Photovoltaic systems from different irrigation systems were sized, with power ratings from 0.736 to 29.44 kW. Their technical feasibility was determined based on the energy supply period and the availability of solar radiation as restriction variables. Economic feasibility was determined by the indicators of net present value (NPV), internal rate of return (IRR), benefit/cost ratio (B/C) and profitability index (PI). Feasible operation was found for irrigation systems with motors up to 11.04 kW; however, for systems that required higher powers, the number of operating hours available was less than the minimum required. NPV, IRR, B/C and PI showed increasing values as a function of increasing power. Thus, off-grid photovoltaic systems without energy storage are technically and economically feasible for systems with power of up to 11.04 kW.

solar power; economic indicators; off-grid; water pumping

Motor power (kW)
0.7	1.1	1.5	2.2	2.9	3.7	4.4	5.5	7.4	9.2	11.0	14.7	18.4	22.1	29.4
Rated current at 380V (A)
1.68	2.4	3.14	4.53	6.25	7.39	8.88	11.3	14.5	17.3	21.3	28.8	35.2	42.2	57.3
Performance (%)
80.5	84.0	85.5	86.5	88.5	88.5	88.5	89.5	90.2	91.0	91.0	91.0	91.7	91.7	92.4
Power factor
0.84	0.83	0.85	0.85	0.82	0.86	0.87	0.83	0.87	0.89	0.86	0.87	0.87	0.86	0.86

Rated current (A)	Maximum power of inverter (cv)	Maximum input voltage CC (Vcc)	Operating voltage CC (Vcc)	Output supply voltage CA (V)
4.3	1.50	810	450–760	380
4.3	2.00	810	450–760	380
6.1	3.00	810	450–760	380
10	5.00	810	450–760	380
14	7.50	810	450–760	380
14.6	7.50	780	350–780	380
16	10.00	810	450–760	380
24	15.00	810	450–760	380
31	20.00	810	450–760	380
32	20.38	810	450–760	380
45	30.00	810	450–760	380
62	40.70	780	350–780	380
76	50.30	780	350–780	380

Electrical parameters solar module
Maximum operating voltage	Vmp	41.7	V
Open-circuit voltage	Voc	49.8	V
Operating current	Imp	9.6	A
Short-circuit current	Isc	10.36	A
Maximum power	Pmax	400.32	Wp
Module efficiency		19.88	%
Rated operating temperature		45±2	°C
Temperature coefficient	Pmax	−0.37	%/°C
Temperature coefficient	Voc	−0.28	%/°C
Temperature coefficient	Isc	0.048	%/°C

Power (kW)
0.7	1.1	1.5	2.2	2.9	3.7	4.4	5.5	7.4	9.2	11.0	14.7	18.4	22.1	29.4
Area power ratio kW/ha
4.2
Area irrigated by power (ha)
0.17	0.26	0.35	0.52	0.69	0.87	1.04	1.30	1.74	2.17	2.6	3.47	4.34	5.21	6.94
Production (sc)
17.4	26.7	35.6	53.4	71.2	89.0	106.8	133.6	178.1	222.6	267.1	356.1	445.1	534.2	712.3

Associação Brasileira de Engenharia Agrícola SBEA - Associação Brasileira de Engenharia Agrícola, Departamento de Engenharia e Ciências Exatas FCAV/UNESP, Prof. Paulo Donato Castellane, km 5, 14884.900 | Jaboticabal - SP, Tel./Fax: +55 16 3209 7619 - Jaboticabal - SP - Brazil
E-mail: revistasbea@sbea.org.br

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[1] * Corresponding author. Universidade Federal de Santa Maria/Santa Maria - RS, Brasil. E-mail: jhosefe.b@gmail.com | ORCID ID: https://orcid.org/0000-0003-1474-7001