DPDI expertise in power backup systems for critical electronic equipment may include battery back up banks, diesel generators, or fuel cell power. DPDI provides project management for design/installation, hands on structural reconfiguration of housing and facilities, procurement, installation/oversight, maintenance, testing and troubleshooting through to demolition and disposition of retired equipment. Installation may include system start up and test and documentation of as-built system functionality. DPDI, a small business over 20 years operates out of West Yarmouth MA. Mr Nellenback spent 10 years working for large power backup equipment companies performing installations and troubleshooting. His knowledge and expertise warrants DPDI as a much acclaimed resource in the industry.