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  1. GXMnow

    Batteries aren't charging too full, what I'm I doing wrong?

    Looking at that graph, it appears each vertical major division line is at 2.5 minutes apart. So this shows a total charge time of only 4 minutes. That is very short. I assume your batteries are just full. You need to run them down a bit and let them do a full charge cycle that lasts over an...
  2. GXMnow

    Batteries aren't charging too full, what I'm I doing wrong?

    Dacflyer's batteries are essentially the same chemistry as mine. Both are repurposed EV cells. His are in rigid prismatic cases, mine are pouches, but the voltage curves should be the same. In my JK BMS, I have the cell over voltage protect set at 4.2 volts, and I have my Schneider XW-Pro set...
  3. GXMnow

    Adding a third drop in LiFePo4 to two older ones in parallel

    I just paralleled a new set of batteries with my original set that have about 80 full cycles through them. These are larger Li NMC cells, but the idea is similar. You do need to get them as close as possible to the same state of charge. As was suggested, using a separate charger to bring each...
  4. GXMnow

    Adding storage to my Enphase system

    I'll have to check the detailed electric bill, but what I remember seeing before the rate hike is that they would pay the same generation fee back, but obviously not the taxes. I do not remember about the delivery charges. Hmmmm. I am looking over my previous month bill, and I am confused to...
  5. GXMnow

    Adding storage to my Enphase system

    My brother and his wife both drive an EV. With the new rates, their electric bill DOUBLED. They were charging over night when their solar does not produce, and they don't have a storage battery. His wife is now only using the level 1 charger while the sun is out. And my brother is doing a...
  6. GXMnow

    Large capcity NMC

    I am using about 36 KWHs worth of LG Chem Li NMC pouch cells. Each cell is 60 amp hours. I have them in four 3P14S strings. They were originally for the Chevy Bolt. Yup, the ones in the news and being recalled for car fires. Charging them to just 4.1 volts, and running them down to 3.75 volts is...
  7. GXMnow

    Adding storage to my Enphase system

    That is exactly where I am at as well. The safety system is going to be about 50% of the whole system cost. That is hard to swallow. I get the desire for arc fault protection. DC arcing is a huge danger, but the DIY market just has not gotten there yet. I am at the point, I may just slap a...
  8. GXMnow

    Microwave worked on 24V but not on 48V??

    I would certainly double check all of the connections and make sure there is not a problem somewhere. 2,200 watts is not a small inverter. That should fire up a reasonable microwave. Does the oven still work fine on grid power? 1,200 watt may also be the microwave output. Check the actual power...
  9. GXMnow

    Adding Solar Panels Question

    If you run parallel, yes, each panel should be fused. In series, one fuse protects them all.
  10. GXMnow

    Adding storage to my Enphase system

    I am kind of torn on the whole permit issue with the DC panels. I want to build it safe and meet or exceed all the codes. But going through the city is a huge expensive hassle here. That "Arc Fault" protection is looking to be a pain. The only charge controller that seems to include it is the...
  11. GXMnow

    Adding Solar Panels Question

    I just looked at the EP Ever spec sheet on the 4210. The maximum charge power is 520 watts with a 12 volt battery system. It will just go into current limit and you may clip off some power near solar noon. The input power limit for a 12 volt system is 780 watts. SO your 630 watt 3 in series...
  12. GXMnow

    Adding Solar Panels Question

    From those specs, you could add the third panel and run all 3 in series. Your VOC would be 24.9 x 3 = 74.7 volts and x 1.2 is still 89.64, so you have a solid 20% margin. Your input current would stay ISC 9.85 and IMP 9.3 amps. VMP 22.4 x 3 = 67.2 volts at 9.3 IMP amps would be a peak power of...
  13. GXMnow

    Adding storage to my Enphase system

    So Cal Edison is at it again. In effect, they just made my battery system pay off slower, but, no, not really. It just made solar panels worth a lot more. They just upped the rates again. Not sure when the change went through as I have such low electric bills, I have not been looking at the...
  14. GXMnow

    Adding Solar Panels Question

    Which model of EPEVER do you have? What is the maximum safe VOC voltage? To be able to combine multiple panels, you need to look at the IMP and VMP specifications. If the IMP numbers are close, you can run them in series. The VMP voltages will add together while the IMP will be that of the...
  15. GXMnow

    NIPPLE slip

    I have a pretty good guess as to what caused it to come off. The top piece appears to have the threaded hole go completely through. So I will bet, the screw turned and pushed out the bottom against the cell terminal and tore the factory laser weld. If you have cells like this, you need to be...
  16. GXMnow

    Batteries aren't charging too full, what I'm I doing wrong?

    I have a similar setup with a JK BMS on a 14S Li NMC bank. But mine is built from Chevy Bolt Cells, and I am using a Schneider XW-pro to charge the cells, so the charging is a little different, but the BMS should act the same. I have been trying to help Dacflyer with settings, and his system...
  17. GXMnow

    Heltec (JK) 200A Smart BMS with 2A Active Balance

    I will admit, I never actually tried to push much charge or discharge current without the manual switches on. I did do a few low current tests to see it would block on but not the other. I never once saw it actually switch on by itself. At one point, I have my 10 amp charger running into it, and...
  18. GXMnow

    Heltec (JK) 200A Smart BMS with 2A Active Balance

    You have to make sure you turn them both on manually in the app. Once you set them on, they will go off if there is a fault, but will turn back on when things go back to the release settings. But if it is manually set to off, it will stay off.
  19. GXMnow

    Heltec (JK) 200A Smart BMS with 2A Active Balance

    Are you sure that both the Charge and Discharge FET switches are on in the App? Mine barely gets warm at 50 amps. It measures just about 1 mohm in the proper on state. So 50 amps would be creating just 2.5 watts of heat, but if the charge FET's are off, then it has 0.6 volts of drop on top of...
  20. GXMnow

    Heltec (JK) 200A Smart BMS with 2A Active Balance

    Pure sine wave inverters, and power factor corrected chargers all have a lot of ripple current on the DC side. The current ramps in a half sine wave from zero up to maximum and back to zero, every half a cycle of the AC side. Many meters have a low pass filter built in to average out line...
  21. GXMnow

    BEWARE - ALERT ! GM Recalling ALL Bolt + EV Batteries from 2017 to CURRENT !

    Not that this will help us with our repurposed cells, but GM and LG have come to an agreement. LG will foot the bool, to the tune of 1.9 BILLION dollars to pay for the replacement battery modules in the Chevy Bolts. I am not very surprised, as it did seem pretty obvious that the fault was in...
  22. GXMnow

    Heltec (JK) 200A Smart BMS with 2A Active Balance

    I was even able to set my 14S to 24S JK BMS to 4S and it worked, but I needed to supply to 40 volts to pin 26. I would assume the 8S model will likely need 20 volts or so to operate. It won't hurt it to try at 12 volts, it just might not turn on.
  23. GXMnow

    Hybrid inverters with grid tie mode

    I found an instruction manual for a Solar City H6 inverter, I think it is the same unit. It does mention the RSD capability, and it does use PLC (power like communication), but it does not say if it is Sun Spec compatible. It only lists using their own "SMART RSS" box.
  24. GXMnow

    Hybrid inverters with grid tie mode

    I agree, the caps are drooping, but combined with the direct battery connection, the current is there. The HF booster making say 400 volts peak to peak to drive the PWM sine wave generator does operate at less current, but then the boost switcher needs to transfer the power, it is not just THERE...
  25. GXMnow

    Hybrid inverters with grid tie mode

    I work with several different kinds of electronics, including some high current power supplies and such. Going to high frequency switching has made it far cheaper to build a high pow device. A xenon lamp power supply used to require a 200 pound 3 phase transformer, and a huge diode bridge to...
  26. GXMnow

    Hybrid inverters with grid tie mode

    I am a bit torn on my planned DC array. I want to use 60 cell panels, but then I run 3 in series to the 150 volt MPPT controller. 2 panels in full sun just exceeds the 80 volt limit, so I need a separate RSD on all 9 panels. Might be able to use 3 of the dual panel boxes, and then 3 more single...
  27. GXMnow

    Heltec (JK) 200A Smart BMS with 2A Active Balance

    I only have the one JK-BMS, I have not tried one of the stand alone balancers yet. But this makes some sense here. In the BMS, you still want it to function below the balance start voltage. It can still keep both the charge and discharge mosfets on, and the Blue Tooth. The Power Off Volts on the...
  28. GXMnow

    battery grid feedback

    I have to agree that the utilities are all big complainers. A few years ago, my home town got into this huge "Save Water" campaign. The hit us with limits for lawn watering, gave incentives for low flow faucets and toilets, and even had a program to help change out landscaping for reduced water...
  29. GXMnow

    Hybrid inverters with grid tie mode

    oymyakon With the Schneider XW-Pro, you can add a WattNode energy meter on the grid input and the system can be set to adjust the inverter grid sell power to zero out the grid with no export. SolarPrep I can't give an absolute answer on how well they would work, but I did read up on Tigo while...
  30. GXMnow

    BEWARE - ALERT ! GM Recalling ALL Bolt + EV Batteries from 2017 to CURRENT !

    My first group of cells were from Battery Hookup, and I clearly don't expect any kind of recall to help out with surplus cells. My second set of cells actually came out of a completed car. So they could possibly be tracked to an actual VIN number. But again, the car they came out of was listed...
  31. GXMnow

    battery grid feedback

    My original plan was something very similar to this. I looked at those same GTIL inverters, and I was going to use three 600 watt chargers. I was going to have a microcontroller like an Arduino monitor the output from my Enphase solar. When it topped 1,000 watts, turn on one 600 watt charger...
  32. GXMnow

    battery grid feedback

    Getting the Schneider XW-Pro for $3,000 was a good deal, and I waited a few months to hit the sale and also got free shipping, which is a big deal when the pallet weighed in about 200 pounds. The current price right now at Real Good is $3,234.60 with the free shipping deal. But you also need to...
  33. GXMnow

    battery grid feedback

    I remember reading something about Deye making the hardware, and Sol-Ark wrote their own firmware, and spent the money to get UL listing. As part of their deal, Sol-Ark was to have exclusive rights to sell the product in the USA. I think they held some legal action against Deye when their...
  34. GXMnow

    battery grid feedback

    I have the Schneider XW-Pro 6848 6,800 watts at 120/240 volt split phase. And I now have a usable 36 KWHs of Chevy Bolt battery modules wired in a 14S12P arrangement of 60 amp hour cells LG cells. That makes 720 amp hours at a nominal 51.8 volts. It's about 58% of a complete Chevy Bolt battery...
  35. GXMnow

    battery grid feedback

    $3,000 is on the cheap side for an arm and a leg... But I get where you are going with this. That is where the problem comes in. Any device that can "legally" push power back to the grid has to meet some strict standards. The cheap grid tie inverters rarely bother with all of the requirements...
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