Solar Battery Connections. Modify your battery bank for a series and series & parallel design. www.SolarPenny.com Visit us online at www.SolarPenny.com Video is for basic product information only. Solar Penny is not liable for personal or property damage / injury caused by products in videos. Always seek the assistance of a licensed contractor for installation of electrical products. Contact your local building department to ensure your system meets current city, county and / or state codes.