Battery monitoring

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mlodewyks
mlodewyks Registered Users Posts: 4 ✭
in Solar Beginners Corner #1
Hi Everyone,

I'm a bit stumped as to the readouts I'm getting from my Victron Battery monitor.

Firstly, let me just explain how I've set it up. I have two 48V battery banks (4 12V batteries each) with 120ah C10 batteries. My understanding is that the system would then be a 240ah system, is this correct?

So anyway, going on that, I've set the battery capacity on the monitor to 240ah. This evening when looking at the different readings, I saw the SOC was 85% and the ah consumed -35.2ah. Doing some rough math to get this to the 50% DoD point, I get to 117ah, which must then mean that my understanding of the 120ah/240ah battery bank is wrong.

Any input/guidance would be greatly appreciated.

Cheers,
Martin
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  • westbranch
    westbranch Solar Expert Posts: 5,183 ✭✭✭✭
    #2
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    what are the settings on your battery monitor? You will need to customize them to the bank to start and then adjust for previous use and age..... ps you need the 20 hr rate for use with solar...
     
    KID #51B  4s 140W to 24V 900Ah C&D AGM
    CL#29032 FW 2126/ 2073/ 2133 175A E-Panel WBjr, 3 x 4s 140W to 24V 900Ah C&D AGM 
    Cotek ST1500W 24V Inverter,OmniCharge 3024,
    2 x Cisco WRT54GL i/c DD-WRT Rtr & Bridge,
    Eu3/2/1000i Gens, 1680W & E-Panel/WBjr to come, CL #647 asleep
    West Chilcotin, BC, Canada
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  • mlodewyks
    mlodewyks Registered Users Posts: 4 ✭
    #3
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    I bought Omnipower Solar batteries, they are rated at C10, so I guess I'm stuck with that for now. We are not completely off grid as we still have utility power during night times. I typically let the batteries drain down to 80% SOC before switching back to the utility.

    The only real setting to set it the Battery Capacity. All others seem to be fine with the factory default settings.

    These are the batteries I bought if you want to have a quick look http://www.sinetech.co.za/opssolarbatteries.htm

    Martin
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  • westbranch
    westbranch Solar Expert Posts: 5,183 ✭✭✭✭
    #4
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    OK according to this doc http://www.sinetech.co.za/ops_batteries/OmniPower-Battery.pdf your batteries are rated at 120 Ahr for the 100 hr rate and at 100 Ahr for the 10 hr rate so I am guess ing that for the 20 hr rate they would be ~ 102 - 105 Ahr

    hth
     
    KID #51B  4s 140W to 24V 900Ah C&D AGM
    CL#29032 FW 2126/ 2073/ 2133 175A E-Panel WBjr, 3 x 4s 140W to 24V 900Ah C&D AGM 
    Cotek ST1500W 24V Inverter,OmniCharge 3024,
    2 x Cisco WRT54GL i/c DD-WRT Rtr & Bridge,
    Eu3/2/1000i Gens, 1680W & E-Panel/WBjr to come, CL #647 asleep
    West Chilcotin, BC, Canada
    · Share on Twitter

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