diy solar

diy solar

Search results

  1. W

    Relay advice for switching off 12v loads when AC loads are disabled by inverter

    So my inverter has a low voltage disconnect which cuts power to the AC output when battery voltage reaches a setpoint (in my case I have it set to 48.5V). But my DC/DC converter which I use to power my 12V loads has no such disconnect. I want to turn off my 12V loads at the same time as my...
  2. W

    Solar Panel Ripped off roof of RV; How to replace with similar panel?

    I had a renter hit somethings with my RV and ripped off one of my panels. If they even noticed, they didn't tell me, and I didn't notice myself until a while later when confused why my solar output was so low... Anyways I need to replace the panel but I can't find an exact replacement: ...
  3. W

    16s w/ bluetooth suggestions

    I have two 24V a124 batteries from bigbattery in series in my RV. They are these ones: Each has its own 8s BMS. non-descript, from china. Maybe because they are used cells and different, I can't seem to keep the two batteries in balance. I couldn't find a battery equalizer for 24V, but I had...
  4. W

    12v for RV: DC-DC converter or AC-DC converter

    So when I designed my system I actually removed the converter that came with the RV and went with a 48V>12V step-down converter. This works fine but there are a few issues. One is that because the converter is upstream of the inverter, it is not in communication with the LVD of the inverter. In...
  5. W

    I'm looking for a battery balancer for 2x 24V lifepo4, 48V system.

    My two bigbattery 24V batteries are terribly out of balance. Its not a question of just putting them in parallel every once in a while, because the same battery goes higher V on the top and lower V on the bottom. (currently about 1.5V at the top, and 3V difference at the bottom, with...
  6. W

    Inverter not outputting this morning even with generator input (mpp solar 3048 lv-mk)

    So I ran my batteries down to the LVD last night in my RV and just went the night without power, no big deal. This morning, not wanting to wait several hours for solar to kick on the system, I turn the generator on. Inverter sees the input, 124V, 62HZ, but its still not charging or outputting...
  7. W

    Adding parallel battery to existing bank to increase overall system reliability?

    My current system is 2x 24V 100Ah lifepo4 in series for 48V 100Ah. I have had numerous BMS issues and balancing issues that hopefully are mostly resolved. When considering adding capacity I had been under the impression that I was going to need to buy the exact same batteries, but I guess thats...
  8. W

    How to diagnose; weak cell or faulty bms? (Bigbattery 100Ah 24V)

    One of my cells is not like the others... But how do I determine if it's a fault with the BMS or simply a weak cell (actually pouch)? I did a discharge until BMS cut-off due to cell 1 being at 2.5V. Cells 2-8 were +/- 3mV of 3.260V. I called Bigbattery support and they had me do a BMS re-set...
  9. W

    30 amp RV; how do I program inverter to make use of 15 amp Ac input?

    Ok I've been 100% boondocking since I completed my off-grid electrical system. But I just settled into a place longer(ish)-term where I have access to 120V, but only 15 amps. I'm a little confused how to program my inverter to be able to use this extra power, but without tripping the breaker...
  10. W

    My two batteries reach different voltages in bulk charging.

    I have 2x 24V A123 bateries in series, for 48V/100Ah. I noticed recently that while they generally always have the same voltage, they can vary by as much as 2V at end of a bulk charge, with one of the packs getting to 29.6V versus the other at 27.6. Then they will be pretty much the same once...
  11. W

    Solar Efficiency for a flat-mounted array

    Hi, I'm trying to get a sense if my array is outputting what it should. I have 1800watts of solar on the roof of my RV, all mounted flat. No shade obstructions. Yes, it is the middle of winter, but still, I am getting a max of around 900watts (50% efficiency). Is that pretty normal? I am in...
  12. W

    Float Voltage MPP solar Inverter questions

    Just got a system up and running in my rv with an MPP 3048lv-mk. I'm new to this stuff so I have a few random questions: I have float set to 54.4, is it normal that there is almost always 1 amp and sometimes even up to 3 amps of charging occurring in float mode? I was under the impression that...
  13. W

    How does one determine orientation of Balance Lead Connector?

    I'm a little paranoid to make this connection after having done it wrong before. And of course I didn't note the orientation when I disconnected recently for other purposes. So I'd like to know definitively how to determine the proper orientation of this (and any) balance lead connection. It...
  14. W

    Paralleling Batteries prior to putting them in series

    Ok I received one 24V lifepo4 pack back from warranty, the other one I have that didn't get sent in for warranty is at a lower state of charge. They differ in voltage by 0.7V. Prior to putting them in series for my 48V battery bank, I decided to put them in parallel using the same resistor I...
  15. W

    How to disconnect loads at low SOC, but keep inverter on so that charging can occur?

    I have an mpp solar 48volt, 3000 watt inverter/charger (3048lv-mk), installed in an RV. It is my first inverter so I don't know what features differ from other models on the market. But in any case, I want to replicate the super user-friendliness of something that most of us experience every...
  16. W

    Problem Cell in A123 24V, can I fix it?

    Hey all, new here, wondering if it is possible to repair my battery rather than purchase a new one. I have a pair of 24V A123 batteries purchased from bigbattery.com and I have one bad cell. On the first and second discharge, BMS tripped with this cell at 2.5V and all the other cells around 3.1...
Back
Top