... pulse PWN charge current 20A 24V/12V AUTO Warranty 1 year one year gurantee 12v/24v solar panel voltage regulat... K20This solar ... maintenance, service life is up to 20 years Warranty 1 year, but has no obvious dismantling machine or high breakdown. 2 ... with the principles of safety, avoiding personal safety accidents. one year gurantee 12v/24v solar panel voltage regulat...