Most reacted posts

How to recover from a failed firmware update on Megarevo's R8KLNA 1. Power-cycle the inverter. Open the top cover and make sure the LEDs on the control board go out before turning it back on. 2. Re-try firmware upgrade via USB. Usually you need to use your USB-A port on your laptop with a...

1. Power factor sells back power at a constant power factor. 2. Reactive power sells back power at a certain percentage of reactive vs. real power. 3. QU wave changes the power factor depending on the grid voltage and the related settings V1 through V4 and Q1 through Q4. This is also known as...

I would be extremely surprised if it was any different from a standard USB A to B cable. If you ever bought a printer, you probably have one of those in a drawer somewhere.

The controller itself pulls about 18W without the inverter on. They use about 75W no load with the inverter on.

Coulomb counters for BMS state of charge tracking are notoriously bad at keeping track of the state of charge. The BMS also re-calculates the amp-hour capacity based on the measurements of the coulomb counter. It'll probably reset itself to a value closer to the factory Amp-hour value after a...

I'd let the battery rest an hour at zero amps with a disconnected power cable before attempting to check if the voltage is within calibration specs. If the battery is charging or discharging, you will get different voltages depending on where you touch the probes due to the non-zero resistance...

Charging low voltage cells is risky. Internal damage may not be apparent. Take appropriate precautions such as charging in a well ventilated area away from anything flammable. If you do try this procedure, you do so at your own risk. I have taken stored cells from as low as 0.4V and fully...

There's 12V on the two terminals on the far right of that row of green connectors. It'll do 1A max continuous. It's made for stuff like a TIGO remote solar shutdown. It looks like the Orange Pi needs more than 1A at 5V. There is 5V available inside the top cover, but you'd have to splice into...

I think somebody gave you the wrong form for the wrong type of grid-connected inverter. If they're asking for MVA, that's city power. 8kW is 0.008 MVA.

That sounds like a problem with the current sensor. It's usually built into the BMS PCB. So I'd say it's warranty time.

Enable "anti-reflux" to disable selling power back to the grid. Yes, you should install the CTs. The vast majority of inverter operation problems are due to incorrect installation of CTs. Make sure the arrow points towards the grid. Don't mix up line 1 and line 2. Install the CTs right after the...

When off grid, the insulation check turns off the inverter for a couple minutes each day. You can hear some relays clicking. It's measuring the resistance between PV wiring and ground. The ARC fault detection shouldn't have any relation to the PV insulation check. If you follow the PV wires up...

If the RS-485 connection is working, then during firmware update, the hybrid app will show the progress bar making progress. Pretty much any RS-485 adapter will work. Here is the super hard way to flash the .out firmware and recover from a failed .out firmware upgrade if all the above...

A lot of inverters share the same basic design where the PV neg operates at more than -200V. If there is a short in a PV neg line to ground, then the inverter goes boom. You could add fuses in series with the PV neg connections to help protect the inverters. Not sure why these manufacturers...

I'd reduce bulk charging down to 55.9 for LFP 16s battery type and increase float voltage to 55.2. Depending on the BMS settings, if the BMS stops balancing below 3.45V per cell, then that should give you 100%. The BMS should disable charging if any cell exceeds the max voltage. This might be...

Here's what I'd change: Cell OV Protect from 3.7 to 3.65V. Cell OVP release from 3.28V to 3.5V Pack OV Alarm from 54 to 56V Pack OV Protect from 54.2 to 56.8V (I'm assuming 16s since you said 51.2V.) Sleep Vcell from 3.15 to 2.45V Pack full charge Voltage from 53.8V to 54.4V MOS OT alarm from 90...

Set CT limit power to zero. Then try adjusting the zero export power setting. This can adjust up or down to target zero current at the CTs. Reminder that once the battery is down to the target state of charge, it will draw power from the grid if there's no solar.

Usually people install fuses on the solar strings instead of breakers. The midget size (10x38mm) 20A / 690V or 1000V fuse is a common choice.

The BMS is necessary for all lithium batteries. It's considered part of the battery. So yes, you'll need an MPPT charge controller if you are doing separate components instead of an all-in-one aka hybrid inverter.

There are a few reasons this can happen. Here are some: 1. The BMS can't keep track of the state of charge because it's using mostly coulomb counting with voltage correction. 2. The cells have become unbalanced. (most likely) 3. One or more cells is reaching end of life (less likely). Read the...

Ah yes, the BestWay BWBM-610. It usually works fine, but has occasional trouble locking out both charging and discharging. You can recover, but I'd sure like to get my hands on the firmware source code and make some tweaks.

There are inverters available that can interface with existing grid-tied solar. Unfortunately, you'd need to buy a hybrid inverter along with the battery. You don't want to connect the grid-tied solar to a generator. If the inverter ever is successful in sending power to the generator, it could...

Oops. I forgot that option didn't exist in that firmware.

When you say shut down completely, does that mean discharging is also disabled? When the battery gets fully charged, disabling charging is normal to prevent overcharge, but it sounds like more than that is going on. Usually the alarm light for overcharge means one cell went over the maximum...