diy solar

diy solar

Recent content by Jorge33165

  1. J

    Overkill BMS as primary low voltage disconnect

    It is not an on-off switch but a push button that toggles the inverter on-off. It sold to a multilayer PCB My other option is to use a relay or an optocoupler, or just a high-pass RC filter to send a pulse to the correct push-button terminal that turns off the inverter.
  2. J

    Overkill BMS as primary low voltage disconnect

    This is easy to accomplish... All inverters should have that... I have seen many with LVD 9.5 V, not for LiFEPO4, not for any battery... Yes... That worries me too... Both sides... the BMS and the inverter MOSFETs... I was considering adding a high-capacity capacitor for the inverter... But...
  3. J

    Any LVD recommendation?

    No... I wouldn't be asking in that otherwise... It is a push button... I'm considering that too but I need to know when the inverter is on... A capacitor w/ an AND logic... I want it KISS...
  4. J

    Overkill BMS as primary low voltage disconnect

    Not necessarily... The idea is simple. The BMS sensor has to have a high impedance, so I can connect any resistance in series, and using an optocoupler, a transistor-like above, or anything I can simulate one cell loss power and use the BMS as a relay. After that its hysteresis will maintain...
  5. J

    Any LVD recommendation?

    Only 20A... I can use the Rover Li load to control the voltage... The problem is the device that I need to connect in series between the battery and the inverter to manage 60A w/ 100A peak...
  6. J

    Overkill BMS as primary low voltage disconnect

    I have a similar problem. Among the ugly options that I'm considering is opening the battery and using a circuit to fool the BMS by disconnecting one cell and use the BMS as a "relay"...
  7. J

    Looking for Low Voltage Disconnect to protect batteries from discharging.

    I have a similar issue with a 12V. inverter Your voltage is high. You don't have the same issue I have with high current and power loss in relay contact or MOSFETs. You can place a relay in series between the battery and the inverter. Questions: 1. Does your inverter has an ON-OFF switch or a...
  8. J

    Any LVD recommendation?

    It is 100% off-grid. I don't think there are better ways to accomplish this. The problem is simple. The inverter will continue until the battery is 9.5V. Of course, the battery BMS will trigger first around 10.5V or so... But it does not matter... I would like to shut down the inverter before...
  9. J

    Any LVD recommendation?

    Can someone pls suggest a Low Voltage disconnect protection for my LiFePO4 bat? My inverter disconnects at 9.5V (too low for the battery) and has no remote control... I can use the RoveLi load circuit or a custom circuit to control a relay or MOSFET but I'm wondering if someone can recommend a...
  10. J

    Renogy Rover 40A settings for Ampere Time 200Ah Li

    I truly appreciate your advice. I have learned a lot! Thank you.
  11. J

    Renogy Rover 40A settings for Ampere Time 200Ah Li

    I don't see any value in adding a fuse between the panels and the Rover. As you said, The internal resistance of the panels will limit the current to 10A. The cables support two-three times this and the Rover is able to handle more than that too (The parallel configuration generates around 20...
  12. J

    Renogy Rover 40A settings for Ampere Time 200Ah Li

    I don't think a 30A fuse will help. The internal resistance of the cells will limit the current to less than 5A for each panel even in case of a short circuit. So, Using the series-parallel you suggested the current will never go over 9A. The cable perfectly supports this current. So, worst...
  13. J

    Renogy Rover 40A settings for Ampere Time 200Ah Li

    => I know... There are two potential problems: 1) Any transient that the controller may produce that can damage the AC charger or even the Inverter. This can happen even w/ the inverter and the AC charger off but still connected to the battery. Worst if the BMS disconnects the bat. I want to...
  14. J

    Renogy Rover 40A settings for Ampere Time 200Ah Li

    The battery is 200AH and can support 73A charging (Amperetime 200AH Plus, BMS 200A). The problem is any possible interaction between the AC Charger and the Rover Li. This system will be installed in a place where AC power is available randomly for only 6-7 hours a day. Occasionally less than...
  15. J

    Renogy Rover 40A settings for Ampere Time 200Ah Li

    The issue is that I'm planning to combine the Rover w/ an Amperetime 40A AC charger. Initially, I thought I can keep both connected in parallel but Customer Service from AmpereTime offered a weird explanation and suggested disconnecting the controller while charging with AC. I read in the...
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