The top solar panel manufacturers of 2019

Manufacturer	Efficiency range	Temperature coefficient range	Materials warranty
Amerisolar	14.75% to 17.01%	-0.43 to -0.43	12 years
Axitec	15.37% to 19.41%	-0.44 to -0.39	12 years
BenQ Solar (AUO)	15.5% to 18.3%	-0.42 to -0.39	10 years
Boviet Solar	16.5% to 17.5%	-0.4 to -0.4	12 years
Canadian Solar	15.88% to 19.91%	-0.41 to -0.37	10 years
CentroSolar	15.3% to 17.8%	-0.44 to -0.42	10 years
CertainTeed Solar	15.4% to 19.9%	-0.45 to -0.37	10 years
China Sunergy	14.98% to 21.17%	-0.42 to -0.41	10 years
ET Solar	15.67% to 19.07%	-0.44 to -0.41	10 years
GCL	16% to 17%	-0.41 to -0.41	10 years
Grape Solar	16.21% to 17.64%	-0.5 to -0.4	10 years
Green Brilliance	14.24% to 15.58%	-0.45 to -0.45	5 years
Hansol	14.97% to 18.05%	-0.45 to -0.41	10 years
Q CELLS	17.1% to 19.6%	-0.4 to -0.35	12 years
Heliene	15.6% to 19.3%	-0.43 to -0.39	10 years
Hyundai	16.2% to 19.4%	-0.42 to -0.39	10 years
JA Solar	15.8% to 19.8%	-0.4 to -0.36	12 years
JinkoSolar	15.57% to 19.88%	-0.4 to -0.36	10 years
Kyocera	14.75% to 16.11%	-0.45 to -0.45	10 years
LG	18.4% to 21.7%	-0.4 to -0.3	25 years
LONGi Solar	17.4% to 19.3%	-0.39 to -0.37	10 years
Mission Solar Energy	18.05% to 18.95%	-0.38 to -0.38	12 years
Mitsubishi Electric	16.3% to 16.9%	-0.45 to -0.44	10 years
Neo Solar Power	16% to 17%	-0.42 to -0.42	10 years
Panasonic	19.1% to 20.3%	-0.39 to -0.26	10 years
Peimar Group	16.6% to 19.36%	-0.43 to -0.4	20 years
Phono Solar	15.66% to 18.44%	-0.45 to -0.4	12 years
REC Group	15.2% to 21.7%	-0.4 to -0.26	10 years
RECOM	16% to 19.36%	-0.4 to -0.39	12 years
ReneSola	14.9% to 16.9%	-0.43 to -0.4	10 years
Renogy Solar	15.3% to 18.5%	-0.44 to -0.44	10 years
RGS Energy	15.6% to 17.1%	-0.45 to -0.45	11 years
Risen	16.3% to 19.6%	-0.39 to -0.39	12 years
S-Energy	15.61% to 19%	-0.4 to -0.39	10 years
Seraphim	15.67% to 17.52%	-0.43 to -0.42	10 years
Silfab	17.8% to 20%	-0.42 to -0.36	12 years
Solaria	19.4% to 20.5%	-0.39 to -0.39	25 years
Solartech Universal	19% to 19.9%	-0.26 to -0.26	15 years
SunPower	16.5% to 22.8%	-0.38 to -0.29	25 years
Talesun Energy	16.2% to 19.5%	-0.4 to -0.38	10 years