Charging battery’s I figured I could charg



  • wellbuiltwellbuilt Posts: 284Solar Expert ✭✭✭
    Whoops 2/0 g cable 
  • littleharbor2littleharbor2 Posts: 979Solar Expert ✭✭✭✭
    A 175 amp fuse or breaker is a common size in mid sized 48 volt inverters. 250's are common on 24 volt inverters. I see you have 8 battery strings so without rereading the whole thread, just deducting you system is 48 volts.
     Hope I'm not completely out in left field with this comment.

    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, 700 ah @24 volt AGM battery bank. Plenty of Baja Sea of Cortez sunshine.

  • BB.BB. Posts: 27,689Super Moderators admin
    If you have a 48 volt battery bank/bus--A good starting point (of course, use the manual for the "correct" information):
    • 3,600 Watts * 1/0.85 AC inverter eff * 1/42.0 volts battery cutoff = 100.8 amps
    And I highly suggest that you run everything 1.25x (1/0.80) NEC derating for continuous current rating:
    • 100.8 amps * 1.25 NEC derating for continuous current = 126 Amp minimum Breaker/Branch Circuit Rating
    If this is an Inverter-Charger, the actual power requirements may be different...

    Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
  • Raj174Raj174 Posts: 634Solar Expert ✭✭✭✭
    Your system has a 175 amp inverter breaker, so you'll want a 175 amp fuse on each string of 8 batteries.

    3600W PV, MNE175DR-TR epanel modified, MN Classic 150, Outback Radian GS4048A, Mate3, 54.4V 207AH LiFePO4 no BMS, 4500W genset.
  • wellbuiltwellbuilt Posts: 284Solar Expert ✭✭✭
    Thanks for  The information 
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