What would be the possible reason - I have a 48v system and PV input showing at 92V. Whenever I disconnect PV input, or after a night, Growatt will no longer recognize solar input. Disconnect/reconnecting PV cable does not help. Also, the switch in the Growatt does not fully shut off the system, so the only way to recover is to disconnect and reconnect the battery cable.
Growatt 3000 LVM won't recognize PV input unless restarting unit?
- Thread starter Riley
- Start date
MichaelK
Solar Wizard
I usually recommend a cold reboot, but basically that is what you are already doing. If you have not yet tried this sequence, physically disconnect first the solar string, then physically disconnect the battery cable. After letting the unit sit stone cold for 5 minutes, try to reboot it ONLY by connecting the battery cable. If the unit boots up normally, and displays the battery voltage, then reconnect the solar input. You should see the battery voltage jump up a couple of volts if charging is functioning properly.
If there is still a problem, I think you have to contact your seller for a warranty repair.
If there is still a problem, I think you have to contact your seller for a warranty repair.
Doing so can solve the problem, but it will not identify the solar panels again after the solar panels are disconnected and reconnected. It seems it will happen every time overnight. I will check and see if it happens again tomorrow.
sunshine_eggo
Happy Breffast!
It takes some searching, but I can recall folks reporting exactly this issue at least a handful of times:
PV fails to restart every morning.
PV occasionally fails to restart on mornings randomly.
Firmware update or AiO replacement is the usual solution. Hopefully, you bought from Watts247. Ian is very helpful.
PV fails to restart every morning.
PV occasionally fails to restart on mornings randomly.
Firmware update or AiO replacement is the usual solution. Hopefully, you bought from Watts247. Ian is very helpful.
sparrowhawk
Christian Prepper
Ian has been pretty useless in resolving my issues with my inverters including the one failing to resume charging the next morning. He blamed it on everything except the inverter and had me jump through multiple hoops which proved to be a waist of time. I asked if a firmware update would correct it but he wouldn't confirm this.
What I did figure out was that it was taking around 600 watts of solar before it would restart the charging process so during very cloudy day when I needed all the power I could get that inverter was of little help.
But It has also started working normally since the weather has cooled down. The room I keep the inverters & batteries in is an interior laundry room that doesn't have an a/c vent and with the heat the inverters generate keeps the room between 75 & 85 degrees during the summer.
Now that it's winter the room stays less at than 70 degrees and the inverter has been operating normally. So it may be a hardware issue rather than a programming issue.
I'm afraid to try the the firmware upgrade as Ian has given me so much of a run around with the problems I have been having with the inverters (I have been having several) that if the inverters bricked he would probably wash his hands of them and I can't afford to replace them as I have shot my wad on these and have no more wad left.
My Growatt is from Amazon. I'm not sure if the seller knows anything about it; they are just resellers. Maybe I should return it and get Victron instead.
For some reason, my 2670W (445*6) array on my RV is making 1650W, while my 3000W system at home is making 2600W under full sun. It's only 300w less, but I am getting 30-40% less power. It is flat-mounted compared to tilted panels, but the system at my home is from 2014, so there shouldn't be such a big gap with a newer panel and MPPT technology. I'm not sure if it's Growatt to blame.
1650/2670 is about 65% of rated watts. And it is the peak that only happens rarely. When cloudy, I have seen the system at my home are making 1080W while my RV is making 550W.
For some reason, my 2670W (445*6) array on my RV is making 1650W, while my 3000W system at home is making 2600W under full sun. It's only 300w less, but I am getting 30-40% less power. It is flat-mounted compared to tilted panels, but the system at my home is from 2014, so there shouldn't be such a big gap with a newer panel and MPPT technology. I'm not sure if it's Growatt to blame.
1650/2670 is about 65% of rated watts. And it is the peak that only happens rarely. When cloudy, I have seen the system at my home are making 1080W while my RV is making 550W.
You would be surprised at how much this affects output, especially if you have some shading from shit protruding from the roof of your RV.
sunshine_eggo
Happy Breffast!
We're right around the Winter Solstice - literally the worst time for Solar in the Northern hemisphere. Flat panels at this time of year do good to pull 50% of rated.
I didn't find any firmware updates for 48V 3000W Growatt. Does anyone have experience solving this issue? I hate to return it. It's stuck on a VHB tape...
Did you ever get this resolved? I have the same issue, lost PV input on one string of panels a while back and attributed it to the time of year, now I lost it on both. I checked voltage of the PV arrays before connecting to the 48V 3K inverter and they range in the 100volt area when I test it with the multimeter . Once connected to the inverters they report about 1 - 3 volts. The display on the inverters show 0 volts PV. I'd sure like to figure this out and not have to try and ship them back. Thanks.
Offgrid Aussi
New Member
It's been some time since the last post in this thread, but has anyone found a cure yet?
I just connected a solar array to a Growatt SPF 5000 and get the same strange result as GaryB.
The open circuit voltage (Voc) is confirmed 400V, the short circuit current (Isc) calculated 8A.
As soon as I connect the array to the PV+ and PV- terminals of the inverter, the voltage on the array drops to 1-2 volts and the inverter shows 0 volts PV. Restarting the unit or disconnecting it from the battery for 24h did not change a thing.
Any help is greatly appreciated.
I just connected a solar array to a Growatt SPF 5000 and get the same strange result as GaryB.
The open circuit voltage (Voc) is confirmed 400V, the short circuit current (Isc) calculated 8A.
As soon as I connect the array to the PV+ and PV- terminals of the inverter, the voltage on the array drops to 1-2 volts and the inverter shows 0 volts PV. Restarting the unit or disconnecting it from the battery for 24h did not change a thing.
Any help is greatly appreciated.
crossy
Solar Addict
Have you checked and re-checked the polarity of your PV??
rodrick
Free energy enthusiast
Double check all pv connections something might not have a good connection
Offgrid Aussi
New Member
Thanks, I will and will get back to you.
Offgrid Aussi
New Member
@crossy and rodrik: OMG. Please forget I ever asked and thank you so much for asking me to re-check.
I did not think I could get this wrong, but I surely did. The battery terminal right next to it is red for - and black for +, so I just assumed it would be the same. Just an explanation, no excuse. Never assume.
I did not think I could get this wrong, but I surely did. The battery terminal right next to it is red for - and black for +, so I just assumed it would be the same. Just an explanation, no excuse. Never assume.
crossy
Solar Addict
Trust me, we have ALL been there!
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