Battery Bank Fuse Placement

lzhome
lzhome Registered Users Posts: 39 ✭✭
in Solar Beginners Corner #1
I have completed installation of the first phase of solar panels and tomorrow I begin wiring the battery bank. I have seen wiring diagrams and other recommendations but I wanted feedback to avoid any bad decisions. I'm using a 200a fuse on a 24v 310ah battery bank.

Scenario 1: Positive lead >> fuse >> Battery Switch >> positive buss bar >> 2000w Inverter
Scenario 2: Positive lead >> Battery Switch >> fuse >> positive buss bar >>2000w Inverter

With scenario 1 if I need to replace the fuse wouldn't I need to disconnect the cable from the battery first? And scenario 2 I would only need to turn off battery switch to replace fuse.

Which way to go? Or something different?
TriStar MPPT, 8 x 100w PV, MNPV6 Combiner, 4 x 12v 155ah VMAXTanks AGMs and GoPower 2000w PSW Inverter.
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Comments

  • mcgivor
    mcgivor Solar Expert Posts: 3,854 ✭✭✭✭✭✭
    edited November 2017 #2
    Electrically it makes no difference, but it is common that the disconnect comes before the fuse, as in a fused disconnect, for safety reasons, mostly involving higher voltages. 
    1500W, 6× Schutten 250W Poly panels , Schneider MPPT 60 150 CC, Schneider SW 2524 inverter, 400Ah LFP 24V nominal battery with Battery Bodyguard BMS 
    Second system 1890W  3 × 300W No name brand poly, 3×330 Sunsolar Poly panels, Morningstar TS 60 PWM controller, no name 2000W inverter 400Ah LFP 24V nominal battery with Daly BMS, used for water pumping and day time air conditioning.  
    5Kw Yanmar clone single cylinder air cooled diesel generator for rare emergency charging and welding.
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  • littleharbor2
    littleharbor2 Solar Expert Posts: 2,115 ✭✭✭✭✭
    edited November 2017 #3
    These Blue Sea fuses place the fuse at the battery, leaving nothing unprotected.








    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.

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  • Estragon
    Estragon Registered Users Posts: 4,496 ✭✭✭✭✭
    #4
    You don't necessarily need to disconnect the battery to change a fuse in scenario 1, or with the bluesea holders. You do need to be careful though. I open breakers to loads and charging sources, and I always wear long rubber gloves, a long plastic jacket, and face shield when working in the battery box.
    Off-grid.  
    Main daytime system ~4kw panels into 2xMNClassic150 370ah 48v bank 2xOutback 3548 inverter 120v + 240v autotransformer
    Night system ~1kw panels into 1xMNClassic150 700ah 12v bank morningstar 300w inverter
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  • BB.
    BB. Super Moderators, Administrators Posts: 33,654 admin
    #5
    Another "trick" is to wrap your tools in electrical tape when working on the battery bank (new tape the next time you work on battery bank). Just leave the screwdriver tip/wrench end exposed.

    -Bill
    Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
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  • lzhome
    lzhome Registered Users Posts: 39 ✭✭
    #6
    Thanks for the replies. Heading to Harbor Freight to get a face shield :)
    TriStar MPPT, 8 x 100w PV, MNPV6 Combiner, 4 x 12v 155ah VMAXTanks AGMs and GoPower 2000w PSW Inverter.
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