SW4024 Float or not to Float Questions?

stmarstmar Posts: 275Solar Expert ✭✭
I am just about ready to flip the switch and test the new SW4024, had quite a process getting it to this point going from 120 volts to 240 volts, more to change than first thought.
The manual has "Regular AC Support without Xanbus devices": Is this the setting I would use since I have a Prostar controller for my solar array or is there another basic setting that would be better/simplier? And why does it say to use "2 stage no Float"? My battery bank is 4 X Lifeline AGM 400ah 6 volt and with my old SW4024 Float was the normal state. I have the manufacturers voltage settings for Bulk, Absorb and Float and even Conditioning/Equalizing (unique for an AGM) although they say to only use Conditioning in extreme circumstances and my batteries seem to be in good shape. 
Any other settings suggestions/opinions would be appreciated. 

Comments

  • mcgivormcgivor Posts: 2,058Solar Expert ✭✭✭✭
    edited July 26 #2
    Where in the manual dose it mention "2 stage no float" I skimmed through the manual but couldn't find, or missed that statement, I did read that when connected to grid with a standby battery, it's advantageous to have float enabled  to ensure the batteries are always topped up and ready when called upon. Are you using any other features, load shaving or load assist or is this strictly a backup system?
      1500W, 6× Schutten 250W Poly panels , Schneider 150 60 CC, Schneider SW 2524 inverter, 8×T105 GC 24V nominal 

  • stmarstmar Posts: 275Solar Expert ✭✭
    edited July 26 #3
    I will be using it as a backup system. I am probably overthinking it, the 2StgNoFloat is on page 6 Regular AC Support without Xanbus Devices of the Documentation Update 976-0315-01-01 Rev D and in the Owner's Manual page 1-11.
    It says:"For regular AC support mode set the CSW's battery charge cycle to 2StgNoFloat to allow AC Support feature to function immediately after the absorption charge stage."
    I probably want to just set it up as a basic UPS and may not be understanding "AC Support Mode".
  • BB.BB. Posts: 27,689Super Moderators admin
    In general, the AC support mode is used when, for example, you have a 1,600 Watt genset (~13 amps AC) and have >2,000 Watt loads (hair drier, well pump, etc.).

    The inverter will supply the "extra" current needed to run loads larger than the genset itself can manage. Actually, a very nice feature. You get a smaller/more energy efficient genset that supports your "average" loads... And the inverter supports the peak loads from battery (and solar) when needed.

    -Bill
    Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
  • stmarstmar Posts: 275Solar Expert ✭✭
    Thanks, I was not understanding "AC Support Mode", I thought that it was the basic program.
  • MrM1MrM1 Posts: 227Registered Users ✭✭
    AC support mode only works if the loads are very balanced over L1 / L2
    REC TwinPeak 2 285W 3S/3P 2.6kW-STC / 1.9kW-NMOT Array
    MN Solar Classic 150 / 2017 Conext SW 4024 Inverter latest firmware
    Trojan L16H-AC 435Ah bank 4S connected to Inverter with 7' of 4/0 cable / 24 volt system
    Grid-Assist Off-Grid / Need 3200Whs Daily Off-Grid
    System went Online Oct 2017
  • MrM1MrM1 Posts: 227Registered Users ✭✭
    I'd use 3 stage charging and custom settings not the defaults for battery type. The charger is finicky.
    REC TwinPeak 2 285W 3S/3P 2.6kW-STC / 1.9kW-NMOT Array
    MN Solar Classic 150 / 2017 Conext SW 4024 Inverter latest firmware
    Trojan L16H-AC 435Ah bank 4S connected to Inverter with 7' of 4/0 cable / 24 volt system
    Grid-Assist Off-Grid / Need 3200Whs Daily Off-Grid
    System went Online Oct 2017
  • stmarstmar Posts: 275Solar Expert ✭✭
    Now it makes sense, I was just going down the rabbit hole, overthinking. My Lifeline AGMs do have specific voltages for charge stages per manufacturer and I will do 3 stage. Thanks for all the input.
  • stmarstmar Posts: 275Solar Expert ✭✭
    edited July 27 #9
    For my situation, mainly backup/UPS, would it be a good idea to "Disable" the AC Support Mode since it looks like the default is "Enable"? If not are the default settings okay for this option?
    Also I received a USB thumb drive with my order, SW4024 and SCP, but nothing in the documentation about what it is associated with. I would assume it is for firmwear/version  update. Neither the SW4024 or the SCP has a USB port so how would you use this?
  • MrM1MrM1 Posts: 227Registered Users ✭✭
    edited July 27 #10
    The thumb drive contains the manual and documentation. I do not think u can do a firmware update to the SW unless u Also have the combox. The combox is the only product that will have a USB input. I have both the SCP and combox, but if I had to choose between the two - AND - I had the system on a LAN With a connected pc/tablet... I'd choose the combox

    AC support mode is designed to support a battery bank with grid connection. It is supposed to be an interactive system, where u supply the AC loads connected to the inverter with battery / alt energy power until those sources fall below a user selected battery voltage or SOC (if u have the optional battery monitor), etc. When the bank starts approaching the user set threshold, more and more of the load will be supplied by the grid until the threshold is met. At that point the inverter will switch over to 100% grid power and depending on Ur settings will begin to charge the batteries from grid or genny. Once charging is complete the system starts over. Batteries / alt energy sources take over and grid power supply lowers almost completely.

    It's a nice idea...but unfortunately only works in North America if Ur L1 and L2 are almost perfectly balanced. When they get out of balance, the system starts drawing from grid.

    Only u can decide if AC support mode is right for Ur setting. But it covered very well in the manual.
    REC TwinPeak 2 285W 3S/3P 2.6kW-STC / 1.9kW-NMOT Array
    MN Solar Classic 150 / 2017 Conext SW 4024 Inverter latest firmware
    Trojan L16H-AC 435Ah bank 4S connected to Inverter with 7' of 4/0 cable / 24 volt system
    Grid-Assist Off-Grid / Need 3200Whs Daily Off-Grid
    System went Online Oct 2017
  • stmarstmar Posts: 275Solar Expert ✭✭
    Thanks, guess I will play with it and see how it acts/works for my situation.
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