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  1. jbatx

    Panels to the rain roof advice

    Hey peeps, I have 20 t250 panels on make shift "ground mounts"... scrap lumber, rocks, laying on the ground. It's time to get them moved up to my rain collection roof for a variety of reasons - pv production, safety being the top two. My rain roof is 20×30' and only about a 4-5 degree...
  2. jbatx

    Overkill voltage spike on high cell cut off

    Issue: when one of my bms cuts charge due to high cell voltage, it causes a voltage spike on the dc battery side of things. I have measured this all the way up to 70v. When this happens, my inverter will fault and cut all power until I go out there and reset it. System: I have three...
  3. jbatx

    Hybrid pv and hydrogen white paper

    Stefan Krauter just published a new paper on a hybrid pv and hydrogen fuel cell model for reducing grid interaction, etc. Thought I'd post it here. It's in Creative Commons.
  4. jbatx

    PV input after rain

    It's starting into the rainy season and it just stopped raining on my 5kw array. It's still partly cloudy. I would expect a low/moderate pv input given the past months data. However, I'm currently seeing charge input of about 2500w. That's a lot more than expected. I'm speculating this...
  5. jbatx

    Voltronics hybrid inverter remote control

    I have a new Voltronics hybrid 6kw split phase scc/inverter. Mine is from Sungold Power. But, it's the same unit. https://voltronicpower.com/en-US/Product/Detail/InfiniSolar-VII-6KW-(Split-Phase) I found this repo on guthub https://github.com/gch1p/inverter-tools Has anyone in this...
  6. jbatx

    Sungold split phase 6k hybrid inverter scc review

    Hey all, I didn't find much on Sungold's twist to a 6kw split phase hybrid system. It delivers 6kw split phase 240 from its two 3kw 120v lines. It uses the SolarApp and SaaS platform that others use. ...I imagine that the mfg provides the platform for their customers. The unit...
  7. jbatx

    [sold] Renogy rover 100a and 3000w 48v inverter

    I have a lightly used Renogy Rover 100a and a basic 3000w 48v inverter for sale. Both have been in service for about 10 months and in great condition. I recently upgraded to split phase and a grid tied system. Rover $550 Inverter $250
  8. jbatx

    reliable off-grid internet for monitoring - what are you using?

    I've been using a t-mobile 4g hotspot with repeaters to provide my remote retreat with wifi. It usually gets 2-3 "bars" with no booster. The wifi is 90% used by devices that send data to blynk and another mqtt server. The devices are esp32's and other things that send power usage, battery...
  9. jbatx

    What is "balance capacity" in JDB BMSs?

    The JBD BMSs have value called "balance capacity". This value can be pulled off the device using the Arduino lib. I have three JBD (Overkill) bms's on three batteries and the values I get from them are "45" from both 100ah batteries using 16S 100amp 48v units "120" from the 230ah battery...
  10. jbatx

    Need a JBD or Overkill 16s fast!

    I apologize if this is the wrong place to post this. I screwed up one of my Overkill 16s 48v bms's and I need a replacement fast. Overkill is backordered, again. It doesn't have to be Overkill really, it could be any of the tested version of the JBD unit. Does anyone have one for sale or...
  11. jbatx

    Separate power supply for IoT

    ...this seems like a reasonable forum for this post. I have a few esp32 based devices in my utility container (20' connex). Three monitor the batteries using serial connection to Overkill bms's. One monitors water flow and usage and toggles a uv sterilizer. Right now, the devices are usb...
  12. jbatx

    Solving for voltage drop over 200'

    Hey all, I need some advice on solving a voltage drop issue that has emerged due to some planning and provisioning mistakes which I made. The layout... Shipping container has my batteries, scc, inverter and the array is just out side the container. 21.1 kwh lifepo total capacity 5kw 120v...
  13. jbatx

    Large spiky current draws with no additional load... ah crap

    I checked in on my remote system just a minute ago and I was alarmed. One of the two 48v 16s overkill bms's reported some relatively huge current draw downs momentarily. ...and I dont know why. Hoping you all can plant some ideas. One of the images is of the current chart for both...
  14. jbatx

    esp32 automatic inverter restart device

    I'm thinking of using another esp32 to power cycle my inverter in the event of it hitting low voltage cut off AND AFTER a reasonable return voltage has been reached. The property is remote and I'm not always there so having something like this would be really nice. ...Basically a device that...
  15. jbatx

    48v inverter low voltage cutoff leaves so much on the table.

    Regarding low voltage cut off by inverters. How do you all deal with inverters that cut off long before your bms(s) will? My xyz 3000w inverter cuts ac power at about 46.5 input volts. This leaves so much unused capacity in my 48v 200ah battery bank.
  16. jbatx

    Overkill (JBD) Cell Overvoltage cut-off ....delayed too long??

    Hey folks, I have a strange issue with an Overkill (JBD) BMS delaying cell over voltage charge protection longer then it should ( I think ). I cannot explain it ...100% The set up... 1. I'm working with a 16s 48v overkill bms 2. 100ah cylindrical cell modules from batteryhookup 3. Using the...
  17. jbatx

    Anyone working with the Overkill Solar Arduino lib?

    I'm really interested in getting my system online for remote monitoring, at least. However, I have zero experience with Arduino and embedded but tons of experience as a developer at higher levels. Has anyone here successfully set up remote monitoring for their Overkill BMS(s) using the...
  18. jbatx

    Cell low voltage cutoff blocks charging ....sometimes??

    I'm seeing what I think is inconsistent behavior from my Overkill Solar 48v 16s bms. However, it's likely working as it should and the problem is me and something I've done. Anyhow, when one cell hits the low voltage cut off, the bms appears to completely disconnect from the charge...
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