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Credentials that raise your rate

• Photovoltaic associate

  The entry certification from NABCEP (the North American Board of Certified Energy Practitioners). $25 to apply and $125 for the exam.

• Photovoltaic installation professional

  The board certification that carries real weight with employers and some rebate programs. $125 to apply and $375 for the exam.

• Battery storage

  Home batteries are now sold with most systems, and the crews who can install and commission them are ahead of demand.

• Electrical license

  The single biggest earnings step available in this trade.