Note: Adding batteries to an existing RPS200/400/800 will likely not enhance All round h2o output if process is managing all day instead of making it possible for down time to demand batteries. You can fully discharge gel batteries as many as 90% and still get a for much longer cycle https://knoxopnmj.blogdon.net/5-easy-facts-about-solarenergie-speicherbatterie-described-43305486