Inverter Install

Discussion in 'Installation Photos/Specs' started by dtfeld, Oct 2, 2018.

  1. ttmott

    ttmott Well-Known Member

    Apr 3, 2012
    Space Coast Florida
    2006 52 Sedan Bridge
    Cummins QSM11
    Not mentioned but the neutral conductors for all of the loads on the inverter (those four circuits in your diagram) must have their own neutral buss which ties at the inverter's neutral; very important.... It must be a separate and isolated circuit just like the hot side.
    When the inverter transfers to inverted AC power the neutrals also transfer and then the inverter bonds the neutrals to the boat's ground network which will prevent damage to the inverter, eliminate ground loop noise, and prevent the GFCI devices from tripping; not to mention safety.
    That brings up the bonding of the inverter chassis to the boat's ground plane; That wire should be able to manage all potential faults which, for this energy level, should be no less than a 4 gauge wire.
     
    dtfeld likes this.
  2. BlueYonder

    BlueYonder Member

    127
    Jan 12, 2015
    Chesapeake Bay
    37
    QSC 8.3 600
    What kind of switching? Does this inverter have an automatic switch that prevents two sources of ac power from being connected at the same time?
     
  3. dtfeld

    dtfeld Water Contrails GOLD Sponsor

    654
    Jun 5, 2016
    Milton, GA
    410 Sundancer 2001
    Cat 3126 V-Drives
    Yes. Has an ATS (Automatic Transfer Switch) If the inverter is off, it just passes power through the switch to the attached circuits. If the inverter is On, and there is neither shore or generator power, then the inverter switches to power produced by the inverter.

    That's the genius of Ttmott's circuit. The circuits will automatically have a power source priority. Priority will be shore or generator power (determined by the main generator/shore switches), or inverter power if inverter turned on and no other power source available. The switch time on this unit is about 16 ms and is fast enough that most loads wont notice the switch. I believe it matches the sine wave coming in while switching.
     
  4. northern

    northern Well-Known Member

    Jan 17, 2007
    West coast Vancouver to Alaska
    380 Aft Cabin 1989 GPS and Charts by Nobeltec
    Twin 454 strait shaft
    We have similar unit. It is powered by ten 6 volt golf cart batteries. The inverter is also a 120 AMP charger. We run the generator 1 to 2 hours a day. When we get shore power every 3 to 10 days it takes about 8 hours to fully charge the batteries. We run the cabin refrigerator, a bar refrigerator and 6 cabin 120 volt LED lights for about 5 hours a day. The original house batteries were Trojan and they lasted 8 years at the end they had about 50% of the power when new. We use the generator any time we want a large load like stove, kettle or toaster oven. Will run the microwave for a couple of minutes on the inverter. We used to run the ice maker on the inverter but the batteries were below 12 volts most of the time.
     
    dtfeld likes this.
  5. dtfeld

    dtfeld Water Contrails GOLD Sponsor

    654
    Jun 5, 2016
    Milton, GA
    410 Sundancer 2001
    Cat 3126 V-Drives
    Well been out having surgery, but was able to get this buttoned up with a little help from some friends. Mounted, and wired per TTmott's schematic. Still a few clean up details, a little more wire looming and we should be good. Ordered a 4/0 ground cable.

    As some have mentioned, battery capacity is kind of lite, but I'll address that as an upgrade as needed. My thinking is going with 2x 6V golf cart batts, and adding a remote disconnect.

    The only question is does the install require a galvanic isolator on the inverter...manual is a little fuzzy about that.

    20181016_142320.jpg 20181016_142329.jpg 20181016_142335.jpg 20181016_145304.jpg
     
  6. techmitch

    techmitch Well-Known Member SILVER Sponsor

    May 1, 2008
    Chesapeake Bay, Middle River/Frog Mortar Creek MD.
    1999 270 DA
    Twin 4.3s W/Alpa I Gen II's
    Been following this/your thread with a passion as I love the thought of quiet,... with all of the comforts.
    I'm sure Tom will chime in and agree or correct me but my initial thoughts are: As expensive as that DC positive cable is I would cut that loop out and shorten it, and, the AC cables, are those stranded? Don't like the bundle in that pic (hanging/stress/vibration) but my guess is that you have plans for that going forward.

    Not bagging on your work man as it looks great, just trying to learn.
     
    dtfeld likes this.
  7. dtfeld

    dtfeld Water Contrails GOLD Sponsor

    654
    Jun 5, 2016
    Milton, GA
    410 Sundancer 2001
    Cat 3126 V-Drives
    Techmitch. By all means, critique the install. There are some areas that need to be revised/improved, but ran out of time yesterday. My main goal was to get it generally located and verify operation. I'll finish the details and do a full commissioning.

    I do not like the DC + cable bundle either. I laid out the cables with a measuring tape, but once the large cables were installed, the routing needed to change, and the cable ended up too long. I may go back and see if my original routing works better. The issue I failed to account for is the cables must attach to the unit at 90 deg increments, or the post covers can not be screwed on. If I keep this configuration, I will shorten the cable. Additionally they need to be sheathed and re-loomed as a final step.

    AC side is #10-3 tinned/stranded. I have to go back and add pin crimps to the AC wires as the terminals are setup for solid wire. I had to order in #10's. ABYC code does not allow stranded wire to be installed in a screw down terminal.

    Capture.PNG

    For anyone else looking at one of these, you will also require a #10 3 way terminal connector for the ground leads.

    Capture.PNG
     
    Last edited: Oct 17, 2018 at 8:12 AM
  8. dtfeld

    dtfeld Water Contrails GOLD Sponsor

    654
    Jun 5, 2016
    Milton, GA
    410 Sundancer 2001
    Cat 3126 V-Drives
    AC panel side completed a couple weeks ago. Added a 30 Amp circuit to feed the inverter, and added new copper bus baron the power feed. Added separate Com Bus for the 4 circuits powered by/thru the inverter.

    20181015_132744.jpg 20181015_132750.jpg 20181015_132758.jpg
     
  9. dtfeld

    dtfeld Water Contrails GOLD Sponsor

    654
    Jun 5, 2016
    Milton, GA
    410 Sundancer 2001
    Cat 3126 V-Drives
    No. Using the existing Starboard side house bank. Currently 2 x Grp 31 AGM with a 105 Ah capacity =210 Total and 105 Ah @ 50% discharge. Ttmott added a 3rd Group 31, I may do the same or add couple 6V' at a later date. I think this should be plenty for us on an overnight. We don't get to far away at this point and is likely enough to meet our needs.
     
    JVM225 likes this.
  10. AllTideUp

    AllTideUp Member

    157
    May 6, 2013
    Northern Virginia
    2001 SeaRay 340DA, V-Drive
    7.4 Horizons - 380 HP
  11. dtfeld

    dtfeld Water Contrails GOLD Sponsor

    654
    Jun 5, 2016
    Milton, GA
    410 Sundancer 2001
    Cat 3126 V-Drives
    Had a chance to go back and clean up a few details.

    1. Installed 4/0 Chassis Ground wire
    2. installed and crimped pin terminals onto stranded wire and installed under screw terminals
    3. rerouted + wire to avoid bunched up excess wire.
    4. Installed shrink wrap on lugs.

    The last details are to add terminal boots to protect exposed terminals, add corregated loom and add a few more wire ties.

    20181023_140113.jpg 20181023_140850.jpg
     
    Craig likes this.

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