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Thread: Buying bigger inverter than needed.

  1. #1
    Join Date
    Feb 2010
    Location
    South of Erie, North of Pittsburgh PA
    Posts
    943

    Default Buying bigger inverter than needed.

    I can buy a new fronius IG Plus 3.8-1 inverter about $200 less than the smaller 3.0-1 inverter. Does this make sense when the smaller inverter would work? Maximum usable amp input for the 3.0 inverter is 14 amp which limits me to 1 string.of 16 panels I plan to use. With the 3.8 inverter I still would be limited to the 16 panels in one string. The fronius inverters have 3 power stages and use only as many stages as needed. Do you think the output would be the same for the 3.8 inverter as the 3.0 inverter? The 3.8 inverter The 3.8 inverter can use 17.8 amps which would let me have 2 strings of panels if I decided to add more panels. solarvic
    16 KC 158G & 3 KD185GX-LPU panels on Fronius IG PLUS 3.0-1 inverter and 14 SHARP NDU3A & 1 KD185GXU panel on FRONIUS IG-3000 inverter. All mounted on pole top racks. Retired and enjoying it!!

  2. #2
    Join Date
    Mar 2006
    Location
    SF Bay Area (California)
    Posts
    21,225

    Default Re: Buying bigger inverter than needed.

    I like the extra capacity even if not used... Hopefully the unit will run cooler.

    Since they appear to run three parallel conversion stages--then there should be less losses when there is less solar power available (vs a one stage larger converter with lots of capacitive/switching losses).

    -Bill
    20x BP 4175B panels (replacement) + Xantrex GT 3.3 inverter for 3kW Grid Tied system + Honda eu2000i Inverter/Generator for emergency backup.

  3. #3
    Join Date
    Feb 2010
    Location
    South of Erie, North of Pittsburgh PA
    Posts
    943

    Default Re: Buying bigger inverter than needed.

    I pulled the trigger and bought the 3.8 ig-plus because I wanted the 600 volt inverter. I have 2 regular lg inverters that have the 500 vdc limit. I needed as high as voltage as I could get as the panels are a little over 250 ft from the inverter and I can get them in 1 string. If I used the regular ig I would have needed to use 2 strings at twice the amps. I probably will have one of my regular IG inverters for sale when I get done. solarvic
    16 KC 158G & 3 KD185GX-LPU panels on Fronius IG PLUS 3.0-1 inverter and 14 SHARP NDU3A & 1 KD185GXU panel on FRONIUS IG-3000 inverter. All mounted on pole top racks. Retired and enjoying it!!

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