2 flexmax controller FM60 paralell

Discussion about the MX60 Charge Controller

Moderators: OutBack, OutBack Moderator Team

Post Reply
yamill20
Forum Member
Posts: 10
Joined: Wed Sep 05, 2018 7:44 pm

2 flexmax controller FM60 paralell

Post by yamill20 » Wed Sep 05, 2018 7:49 pm

How to set a two FM60 in parallel, one is absorving and other see charged. How setting for a two controller working on absorving a same time withou mate

User avatar
Kurt Lundquist
Alpha Energy Engineering
Posts: 1447
Joined: Tue May 31, 2011 7:23 am
My RE system: VFX3524, Mate3, 200Ah 24V AGM Battery Bank
Location: Arlington, WA

Re: 2 flexmax controller FM60 paralell

Post by Kurt Lundquist » Thu Sep 06, 2018 7:40 am

Absorb is a current limited charging stage. The batteries can only take a certain amount of amps. For example, if the batteries can only take 30 amps during Absorb then it doesn't really matter if 1 controller is doing 30A or if both are charging at 15A or if one is doing 20A and the other is doing 10A. The important thing is the battery bank is getting what it needs. If you turn on loads that cause a dip in battery voltage you should see the second controller start to add power to cover the extra load. For best performance make sure both charge controllers have the same charge settings. Use the Advanced Menu vBatt Calibration to calibrate battery voltage reading on both controllers while the system is at rest.

-Kurt
Kurt Lundquist
Renewable Energy Project Engineer
http://alphaenergy.us/

Post Reply