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  • fuse question (inverters)

    I am contemplating purchasing a huge inverter.... 3500watts; by simple math,

    3500W/12V=292amps

    as far as I know, there is no such thing as a 300amp fuse....can I combine smaller fuses to make one large fuse for this, or should I be looking at this from a different angle?


    edit:
    actually, its 3500 continuous, so I'm looking at 7000W peak...so make that 600amps

  • #2
    Alright, how many watts do you really need?? If you need 3500 watts, you need to reconsider running the dozen or so server racks that you must be thinking about.

    It is more like this: 3500/120 = 29 amps. And a typical inverter is something like 80% effecient. You would have to check on the inverter to see on the actual current draw at maximum draw. In fact, the inverter may actually come with the fuses and wiring you need. I know they have big inverters like this in tractor trailers (microwaves, min-fridges, etc.), so there has to be a solution.

    I don't you really need more than a 500 watt inverter. And of course, you can always fuse it at a level you feel comfortable with; lower isn't going to hurt anything.
    2000 Subaru OBS

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    • #3
      Originally posted by kiltjim
      Alright, how many watts do you really need?? If you need 3500 watts, you need to reconsider running the dozen or so server racks that you must be thinking about.

      It is more like this: 3500/120 = 29 amps. And a typical inverter is something like 80% effecient. You would have to check on the inverter to see on the actual current draw at maximum draw. In fact, the inverter may actually come with the fuses and wiring you need. I know they have big inverters like this in tractor trailers (microwaves, min-fridges, etc.), so there has to be a solution.

      I don't you really need more than a 500 watt inverter. And of course, you can always fuse it at a level you feel comfortable with; lower isn't going to hurt anything.
      ok, first, 29 amps is the draw at 120, not at 12 (I'm not saying you were asserting that it was at 12, but that knowing its [email protected] is rather irrelevant to the discussion) While I am quite aware of the efficiency defecit with inverters, and while I am aware that most of the time I will never exceed the limitations of a normal inverter (I currently have a 750watt), in the future I may wish to run other high wattage devices on camping trips (such as minifridges and microwaves). Still, the question remains, can I tie together fuses to equal the draw amount of the peak (granted, as most people will say, your average battery and alternator cannot run an inverter of this size at normal for very long....I would like to do this just because, and the why I feel I need a 3500watt inverter is not important here)

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      • #4
        Wow..yeah..and that's a lot more than stock battery/alternator could probably handle..

        Also most of the inverters i've found online that can handle that kind of wattage run at 24v, not 12v.

        But.. beyond that. Technically you can 'gang' fuses together in parallel, as long as you have the same size wiring all around. Though, for something that big you really need to be running something like two 2 ga wires or a 1/0 cable from your battery to the inverter..

        You're best off checking with local car audio shops, sometimes they do large systems that require heavy power loads, so they might carry a breaker that'll handle it (instead of a fuse)

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        • #5
          Originally posted by Jahntassa
          Wow..yeah..and that's a lot more than stock battery/alternator could probably handle..

          Also most of the inverters i've found online that can handle that kind of wattage run at 24v, not 12v.
          this I know; I have indeed found a 3500/7000 inverter that runs on 12v power; it should be understood that I will have to replace the battery and alternator (possibly alternators after this upgrade); this is going into a large pickup, so I have lots of room to work with in the cab and under the hood.

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          • #6
            Originally posted by Jahntassa
            Wow..yeah..and that's a lot more than stock something like two 2 ga wires or a 1/0 cable from your battery to the inverter..
            also, I would indeed end up going with 0 all the way, and some hefty solenoid relays.

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            • #7
              look up a 0 guage anl fuse holder on ebay for amps. I currently have one and i have a 150 amp and a 300 amp fuse that i can put in it.
              Fuse: http://cgi.ebay.com/ANL-FUSE-300-AMP...QQcmdZViewItem
              holder:http://cgi.ebay.com/ebaymotors/STING...92089230QQrdZ1
              hope that helps

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              • #8
                Originally posted by Jcarere
                look up a 0 guage anl fuse holder on ebay for amps. I currently have one and i have a 150 amp and a 300 amp fuse that i can put in it.
                Fuse: http://cgi.ebay.com/ANL-FUSE-300-AMP...QQcmdZViewItem
                holder:http://cgi.ebay.com/ebaymotors/STING...92089230QQrdZ1
                hope that helps
                very very cool; Thanks!!!

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                • #9
                  No problem

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                  • #10
                    Originally posted by gareva1
                    ok, first...
                    I apologize. I probably came off a little strong. I really meant that as a friendly suggestion.

                    As far as the multiple fuses go, I think there may be a probelm doing this as well. If there is even a slight difference in the resistances of the wire, contact between fuses and holder, etc. you run the risk of blowing out one fuse, and a chain reaction following it. I know it stands true for other circumstances: ICs and relays.

                    But since you found the other fuses, go for them!
                    2000 Subaru OBS

                    Dell P3 @ 900 Mhz
                    7" Lilliput TS w/DigitalWW in-dash mount
                    80GB External HD

                    I am Zero Bitrate....

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                    • #11
                      Yeah, ANL fuses are the way to go... I've seen 300A fuses at several online car audio places (such as http://www.partsexpress.com/pe/showd...number=071-958 , etc). With that much current, especially for a semi-long run, you may want to consider 2/0 awg cable.

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                      • #12
                        you need to see what motor homes are doing... this is a typical application for this amount of "inversion"...
                        EPIA SP13000, 512 DDR400, Seagate 300GB, Belkin PCI 802.11g w/external antenna, Holux GM-210 GPS, XM Direct w/ serial, Dlink FM, Opus 120 p\s, Rockford P4004 amp, Xenarc 7" VGA touchscreen custom mounted in double din spot -- see pics and write up here!!

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                        • #13
                          I would personally recommend using several smaller 'standard' automotive fuses. They're cheap and easy to get at 3 in the morning when you're up late working on your setup, or from your highbeam headlight circuit when you're on a roadtrip in the middle of nowhere. You can combine the fuses in parallel for the same wire. In fact, a lot of big inverters I've seen do this for their builtin fuses. Note that if you wind up running dual wires to the inverter, you need to give each wire it's own fuse(s).

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