MT50 with Two Controllers

somesomsomesom Registered Users Posts: 1
I have two solar systems feeding one 12v lithium 200a/h battery.  can I successfully use one MT50 to monitor the battery?
Mainly what I want to do is know the SOC (how much more power is left).  I think with one MT50 on one controller I will not know the power coming in from the other controller. so SOC will be unknown.  What or how do I monitor SOC?

I have 200 watts 24 volts solar into an Epever charge controller - times two (two identical panel/controller systems feeding into the battery).


  • littleharbor2littleharbor2 Solar Expert Posts: 1,699 ✭✭✭✭
    You need a shunt based monitor to count all current going into AND out of your battery. There's Bogart Trimetric, Victron and others. Without a shunt it's hard to judge the state of charge based on voltage alone.

    2.1 Kw Suntech 175 mono, Classic 200, Trace SW 4024 ( 15 years old  but brand new out of sealed factory box Jan. 2015), Bogart Tri-metric,  460 Ah. 24 volt LiFePo4 battery bank. Plenty of Baja Sea of Cortez sunshine.

  • BB.BB. Super Moderators, Administrators Posts: 32,642 admin
    As LittleHarbor says... Shunt based battery monitors--You can get some nice ones from our host:

    And if you want to try something less expensive, there are a surprising number of battery monitors in Amazon and other places:

    Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
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