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You guys nailed it - I finally heard back from my guy (they're not the best at customer support, and I no next to nothing about solar) and he said the third panel in series creates too much voltage for the Growatt to handle. He said the simple fix is to rewire the panels in parallel. When they...

@ger164 thanks for sharing those pics and description - did you get things working? Question for everyone - if I were to buy a couple 12v batteries and wire them in parallel to get to 24V, could I use those to "jump start" my Growatt? My big battery still dies overnight, and on a sunny morning...

Ah okay I was confused about BMS... There was a BMS wire that came with the Growatt for connecting to the battery and because I had no way of connecting that wire I was unsure as to my BMS situtation. Seems my battery has it built in - sorry about the mixup!

I used one of these $40 cheap chargers on LiFePo4 mode and it had my battery charged in a little under a day: https://www.amazon.ca/gp/product/B08NVG5ZT3/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1 Though I don't have a BMS... my solar guy built the battery custom and installed computer...

At the moment they're being stored in my basement (currently sitting at 26.8V) but during the spring/summer/fall they help run a refrigerator (along with PV direct from the panels) as well as LED lights, occasional tools, charge laptops and phones etc from the trailer. So yes, continual loads, I...

From my supplier: "These Chips are called BMS (Battery Management system) units, their job is to make sure that the battery is only charged under safe conditions. Generally, the Growatt does the same thing but this acts as a second layer of protection in the case that the Growatt unit may fail...

Thanks Just John, I'll give that a go if my battery dies again. Although I think the Growatt has a setting to shut down battery consumption at a certain level.. so perhaps I can use that as a failsafe overnight or when using the battery during cloudy periods so I have enough juice to kick things...

Also - requesting tech specs for panels and a description of that those computer boards are all about... will post here when I hear back. Thanks again everyone for your input!

Hey Guys, Is it possible for me to use 3 x 12v 30ah AGM batteries with my 24v SPF 3000 LVM Growatt inverter? The Growatt is hooked up to 3 x 440W panels in 3S (inverter couldn't handle 3P at peak sun), off grid. I am unclear on how I would get BMS communication between the AGMs and the...

Thanks! Much appreciated.

Ahoy! Fellow Canadian here with generator struggles. My Growatt SPF 3000TLM LVM won't accept AC input from my Generac 6500 XL. The utility icon flashes, and the shows over 120 volts AC input but the diagram doesn't show that power getting to the battery or loads. Guessing I need to buy an...

Thanks for the info! The guy who built my battery says low voltage is 24V. So you're thinking I should try putting setting #21 to 24.5V?

@Rednecktek thanks for the thorough reply I really appreciate it, and it's a huge help :) So maybe I can boot up the Growatt with just 2 of the AGMs and set the low voltage cutoff to 50% to protect the batts? @DThames I have a 4kwh LiFeP04 that isn't holding a charge (dies overnight) and will...

Yep I'm in for some limping! When you say "turn off" do you mean at the power switch or should I disconnect the batteries altogether? I've noticed that "turning off" the Growatt at the power switch stops it from producing AC but it remains on if there's solar. Then it powers off once the sun...

Thanks, I've lowered Fv to 27.6V

I got my "80% charged" by just seeing what the Growatt was showing for the battery voltage (26.6V) under no loads. Under no loads, having it show 26.6V and then 26.1V 12 hours later (Growatt was turned off) is how I'm concluding that my battery is having problems. Guys, assume I know nothing...

Hey does anyone know how many batteries are wired together here? And whether they're in series or parallel? I want to make sure I have the correct number specified in my growatt settings. Thanks! For your entertainment, my guess is: 1 battery in series.

Thanks, do you have a suggestion for what I should set my voltage cutoff to?

Thanks for the reminder! This scares me a bit. It sounds to me like running a 24v Growatt with 12v batteries is just a bad idea in general, probably best to just wait until the big battery is back in business.

I have a strange scenario for you guys: I kept my 4000W LiFePo4 battery stored in my basement all winter, using a "smart battery charger" to give it some charge every month or so (the smart charger only seemed to get it to 70%). It seemed to hold the charge pretty well, not losing much charge...

Thanks ya I think I'll just sit tight until the big boy is back - didn't realize I was in "things might blow up or light on fire" territory, and I certainly don't know enough not to be a danger to myself and my shed :P

Thanks @marex you're right about the noise, my Generac is loud. Next time I'm up, I'll take a shot at the settings you mentioned and see if I can get the Growatt to accept the Generac. Now that it's fall we're getting into more cloudy days and so more need for the generator. Hey, do you know off...

Thanks @Rednecktek good idea to check with the meter. I'll do that next time I'm up there. Hey do you know whether the Growatt has some kind of cold protection built in to prevent it from charging the LiFePo4 battery below freezing? I've been worrying about that now that it's getting colder. Thanks.

Good to know! Setting to 25v now, thank you sir!

Hello everyone, I have a Growatt Off Grid Solar Inverter SPF 3000TL LVM 24v receiving PV from 3 panels 440w each, in series, able to charge my LiFePo4 battery (a custom built 4000w without BMS communication supplied by a local solar company) and power the loads in my trailer. The main appliance...

Thanks for the replies! So on my 24V Growatt SPF 3000TL LVM are the defaults fine (pic attached) or should I modify these settings to keep things more in the green?

Hey Everyone! My Growatt is displaying fault 08: high bus voltage anytime the panels (3 x 440W bifacial in series) are in direct sun during peak hours. I don't know anything about anything but it seems like my panels are overwhelming the Growatt. My battery is custom built LiFePo4 with no BMS...

Wow it sounds like your setup is pretty awesome! Would love to see photos. Thanks for the input about the battery temp cutoff being controlled at the BMS. My battery doesn't have BMS communication to the Growatt but the guy who built it for me installed these little computer boards in there and...

Do the red zones represent anything in particular? For example, my understanding is that with lead acids it shortens the battery's life to discharge them completely... so staying within the 50% - 100% charge range is better for longevity. Does this chart show a similar "ideal charge range" for...

@sunshine_eggo thanks for the reply - I should have mentioned there are computer chips and temp sensors wired in. These don't communicate with the Growatt via a BMS cable but they do provide low temperature charge protection and perhaps other things the BMS would do that I'm unaware of but my...