Recent content by Maast

  1. Maast

    Over-paneling Victron MPPT controllers.

    You might want to add something like: When overpaneling, since unused power from a panel raises the input voltage if you hit the maximum input power limit the panel voltage will start rising towards their VOC voltage. Or words to that effect.
  2. Maast

    SOL-ARK/DEYE Competitor - UL-Certified Megarevo 5KW-8KW 120/240V 48V Hybrid Energy Storage Inverter

    Whats the idle loss wattage? Idle loss is the single most at-a-glance determinor of if it's a quality product or not. If its more than 5% of its nominal output then this is no better than the current crop of Growatts/MPP/etc and their horrible idle loss numbers.
  3. Maast

    What Current Brand Do You Trust The Most? (Off-Grid)

    Honestly, if I'm in a trailer in the middle of nowhere I want absolutely deadnuts reliable and I'd rather go with a component approach and the brands that "just work, always" with "just can't kill it no matter what I do to it" reliability: Victron, Outback, Magnum, Midnite pretty much...
  4. Maast

    Unistrut maximum span distance

    Looks good! I would also add rear 45 degree bracing. The bending moment at the base of your poles in a wind gust will be a lot more than you think and pipe bends easier than you think.
  5. Maast

    Whats the difference between the 'N' vs 'K' 280AH cells from Amy?

    Thanks! Much appreciated. Of course now I'm looking at the new 304AHs too. A bit more capacity in the same space.....
  6. Maast

    Whats the difference between the 'N' vs 'K' 280AH cells from Amy?

    Havent been on the forum much lately, summer projects have taken precedence (~1850 yards of fill dirt to level out back yard, sprinkler system and fence) but I'm starting the research phase of adding on to my monster sized BYD bank and I noticed Amy has two types of cells and am wondering what...
  7. Maast

    Chargery BMS, DCC (Solid State Contactor) thread.

    Eventually it would, but at such a low draw it'd take years on my 64kwh bank to even be noticeable, the BMS draws more than the resistor. On a small bank like for a ebike it'd wouldnt be such a good idea though and it would indeed draw down a battery. I also found that the surge on my gigavac...
  8. Maast

    Anybody actually running their Chargery using the external power port connected to the pack via a diode?

    Its just a plug-->diode-->inductor-->diode-->twisted pair wire and then the same on the other leg with the diodes. The inductors are 330uH 3A toroidials and the diodes are 20A axial schottkey that I had laying around. I think I got both from Amazon. It does drop the output voltage about 2...
  9. Maast

    Anybody ever parallel 2 or more of the the Heltec 5A active balancers?

    FWIW I ended up going with the 10A supercapacitor balancer. Works awesome.
  10. Maast

    grouping multiple Solar Roof Tiles/Shingles per Tigo optimizer?

    I don't see any problem paralleling or serial connection groups of modules to a tigo optimizer - as long as you stay within the optimizers voltage and wattage limitations. You're much more likely to cook a optimizer if you overvolt it (rather sensitive to overvoltage conditions), if you overamp...
  11. Maast

    Stand Alone Solar Arc-fault protection devices.

    Midnite has a few shunt trip breakers, for example the MNEDC250RT, the only caveat is that they require 1 amp to trip, which is more than the PVAF can handle directly but a interposing SRR would handle that.
  12. Maast

    15AH LiitoKala 33140 LFP review and test results

    Max is 1C which'd be 15A, standard charge is .5C or 7.5A
  13. Maast

    EMP-proofing my system with tvs diodes design idea

    Without getting into specifics, I'm fairly rural and I have been a fairly hardcore disaster prepper since 2005. There isnt much I'm not prepared for. I've always simply assumed I'll be feeding the neighborhood (all 8 houses of it) even though half of them are preppers of various levels too...
  14. Maast

    My DIY 300A cell amp hour tester and cycler

    The BYDs were badly under expected capacity but worse than that the individual cells in the modules are horribly capacity mismatched and I had to figure out a way to even them up. Required a shitton of testing and cycling per module and then adding booster cells to the weak ones. Rinse and...
  15. Maast

    My DIY 300A cell amp hour tester and cycler

    It's sitting on a shelf somewhere, I'll see if I can find it. I ended up going in a completely different direction with used BYD modules - which turned out to be a huge mistake and almost a year of labor. I should have stuck with the 280AH cells. I think I might have been the first to get...