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  1. J

    Two questions regarding wire sizing from array to controller

    I've reached that point in the project where I'm second guessing everything and running out of money. I could use some help with the thinking part. My ground mount array will be 4640w, 16x290w, Two banks of 4S2P feeding two separate PV inputs on a Growatt 12k. I plan to mount the disconnect...
  2. J

    Can I leave LiFePO4 batteries in the cold

    I have a 48v 100ah LiFePO4 battery on a portable setup. I charged it to 100% and then put it in a non-climate controlled shed where temps can occasionally drop to 0C and below. I know not to charge below 0C and I believe I can dicharge down to -20C. My question: any harm in letting the...
  3. J

    Ok to assume BMS communication if growatt 12k showing battery status

    Connected up growatt 12k to four EG4 lifep4 batteries. Set dips, ran data cables, chose lithium in option 5 and in 51 chose L01 (per signature solar). Growatt tells me batteries are at 49% and charging. Can I assume it is talking properly to batteries if it is able to grab this info?
  4. J

    Can I just charge batteries one at a time (with the BMS only connected to one)

    Finally wiring in my Growatt12k to my four paralleled EG4 LIFEPO4's. I have no load on anything yet. To bring the batteries up to charge, my plan was to conenct the BMS cable from the Growatt to ONE of the batteries, set the battery to master, and then charge it with the Growatt. Then power...
  5. J

    Should I thread busbar?

    Putting together a rack for batteries and busbars. The copper for the busbars is 1/4"x1". I had planned to just drill it and put a bolt and nut to hold on the terminals from each battery and the 4/0 going back to the inverter; but there is not a huge clearance between busbar and rack, so I...
  6. J

    Leave a space beteen racked batteries

    I am racking four EG4 LifePower 4 48v/100AH/5.12KWH batteries. I did not see a fan on them so set up the racking to leave 1U (about 1.5") of space between each battery to help them keep themselves cool. BUT...every picture I look at of other peoples setups has them stacked right against...
  7. J

    How Long can LiFeP4 batteries sit with no charge?

    I purchased four 48V 100AH LiFePower4 Battery by EG4 batteries that I received in January. My plan was to wire each individually to my GroWatt inverter and charge them off grid, and then once i had done that for all 4 individually, I owuld wire them all up in parallel, and conenct them...
  8. J

    Parallel connecting four 48v 100AH batteries - cables or busbar

    I'm planning on paralleling four LifePower 48V 100AH rack mount batteries. My original plan was to make a bunch of cables for them from 4/0. The terminals allow cables to run up/down so my plan was to run from one terminal to the next in the rack. BUT... recent Will video he mentioned, "of...
  9. J

    How to wall mount a HEAVY inverter on a cinderblock wall?

    I got a Growatt 12kw - it weighs 165 pounds (and apparently I am not in as good a shape as when I was in my 20's). Normally if I have to mount stuff on a cinderblock wall, I first mount a sheet of 3/4" plywood (using 1/4"x20 read heads - expanding sleeve bolts) and then mount equipment to the...
  10. J

    Here's my layout - Opinions?

    Been hitting this forum hard to try and educate myslef. I know electricity (a bit) but not so much with solar. I got inverter and batteries are coming soon. Got used panels, but won't be putting up panels till spring. This is an "off-grid" install for solar purposes (though for now I am...
  11. J

    First time mounting (solar panels)

    Picking up some used solar panels. Guy apparently has a company that does "rip offs". I ask him if he also has any rails for sale. He says, "no one really uses rails anymore - that's old school". I had plans of using Ironridge XR100 rails on top of Quickbolt supports. It is an asphalt...
  12. J

    How high is too high on PV voltage?

    Looking to use Znshine 365Watt Mono half cut cell panels (Vmp=34.0; Imp=10.74; Voc=40.8; and Isc=11.33). I’m feeding a Growatt 12kw (has two PV inputs rated at 250V each) attached to 4 x 48V x 100aH batteries. I want to run 4 strings of 5 panels each (5S4P), (to get me 7200 watts - yes, the...
  13. J

    Outback Radian 8kW or MPP Solar pair for 13kW?

    I have four things to power (well pump, sump pump, fridge and oil furnace). Very unlikely all four would start at same time, but if they did, they would pull 92Amps and 11,100 watts. Am I better off going with the Outback Radian GS8048A-01 which can handle the surge better, or a pair of the MPP...
  14. J

    Sizing Inverter to Inrush Current?

    New to solar, and looking at the MPP "all in one" inverters. Trying to figure out how large I need to go, so I measured inrush and running current on the 4 things I plan to run (a well pump, oil furnace, sump pump and fridge). My question is: do I need to size the inverter to accommodate the...
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