This video shows the proper way to connect 4 batteries in parallel to achieve balanced charging and loading. Traditional wiring of batteries in parallel will cause premature wearing of individual batteries and shorten the life of the whole battery bank. The link to the website I refer to is:
www.impactbattery.com/blog/po...
For an alternative view of this same concept start this video @ 14:45-
• How to correctly wire ...
I am not educated in electronics nor do I have experience working in the field. A professional electrician should be consulted before attempting complex wiring. Failure to do so can result in property damage, injury, or loss of life.