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I only have a 20W heater in this battery. 20W @ 12V = 1.67A. The charger is 2 Amps. I have done several tests and the way it works is, if the battery is (less than full) and actively charging when the temp goes below the low set point, the BMS will shut off the charging port and redirect that...

Yes, but if the battery is full, (even though a charging source is connected), there is no power flowing into the battery (because it's full) and therefore the heaters are not activated. Poor design in my opinion.

You are probably right. Once there is no current flow, there is noting for the BMS top sense. I will test it anyway. The best answer if for JBD to redesign that function and give us more control options in the App.

In a previous battery of this type that I built for my Generac Standby Generator, I used a KSD Bimetal Thermostat (NO 5C) that has worked OK but I was hoping the new HEAT function on the BMS would work better.

I guess there is a lot of back story that would help define the issue and my goal. I am in South Central Texas so we do not have freezing temps all that often. I also have fabricated 12V batteries for my vehicles using Headway 38120HP Cells with custom 3D printed cases. The way I understood...

OK. When the battery is full, and the smart charger is in sleep mode, and the temperature drops below the setpoint, the heaters will not kick on because the BMS does not sense that it's hooked up to a charger. The heat mode only works when it has charging current. It seems that it has to...

You did not read the entire post. I understand that it is working as (poorly) designed. It does not work with a full battery hooked up to a smart charger that has gone into sleep mode. Any ideas how to make it work other than a non-smart trickle charger?

I have several JBD BMS with the HEAT function that are not working... at least not in the way I need them to work. I have discovered (by trial and error) that the heating function only works if the battery is connected to an active charger. The best I can tell, if it's connected to an active...

First of all, the heating function only works if the battery is connected to an active charger. The best I can tell, if it's connected to an active charger, when the BMS senses the temperature has reached your "Charge under temp Trigger Value" setting, it simultaneously turns off the Charging...

I just tried out my new Chargeveter last night and it's not working as expected. I hooked everything up, started the generator, went to the Chargeverter and saw that the screen was powered up and it was reading the Battery voltage correctly at 50.4 V. I went into the Settings screen and set it...

Anyone from Texas should understand this phrase. Tell them to "COME AND TAKE IT!"

I actually got a response back from Growatt Technical Support indicating that they were going to look into solving the problem. Time will tell.

Just a note to report that my unit is not charging again today. No reason that I can tell. I logged into the Settings via the Growatt Dashboard and changed the "Charging Constant Voltage Point" setting by 0.1 Volt and saved the setting and a few minutes later the Dashboard now reports that the...

The Firmware update package you are requesting (and an outline of how to successfully install it) is in this post. https://diysolarforum.com/threads/growatt-12k-latest-firmware.53805/page-3#post-817434 Unfortunately, it did not correct the problem of the solar randomly not showing up. Less...

Heating pads come in lots of shapes and sizes and I find it useful to use low wattage ones to make sure they do not get too hot. Here are a few examples. https://www.amazon.com/gp/product/B0BLW7BTH1/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1...

I have that exact unit and it has been working well for a few years. It is even mounted in my hot attic (125F+) in the summers and so far it's on it 3rd or 4th Summer and still working. Regarding building things, I love to build things but do not understand electrical/electronics as well as...

There are different types of systems. Look into a Drain Back System. Like this design. https://solarconsultants.com/drainbackrheemstecaman/ If you have enough solar to produce PV to heat your water in winter, there should be enough for this system to work even better.

Very nice!

I have attached the latest firmware update package that Growatt sent to me in Oct. 2022. I believe this to be the most current one. The only difference is that I updated the ISP Tool to the newer V5.03 (they sent to me last month) and I removed the .mov file that I did not find helpful (and...

I would like to report that I was able to successfully re-flash my Growatt 12k and get it working again. The short answer is trying to flash it with a Windows 10 computer failed and ended up bricking the unit. When I switched back to my Windows 7 laptop and it worked fine. I was even able to...

I would like to report that I was able to successfully re-flash my inverter and get it working again. The short answer is trying to flash it with a Windows 10 computer failed and when I switched back to my Windows 7 laptop and it worked fine. I was even able to successfully revive an Inverter...

After contacting Signature Solar, they told me my unit was about 3 weeks out of warranty so they could not help. I contacted Growatt directly and it took a while but they finally responded with suggesting I try the newest version of the ISP Tool Version 5.03. I tried that a few nights ago and...

The firmware install (according to the screen) made ZERO progress. The start command just kept scrolling but no progress was seen in any of the progress bars or widows. Apparently it did something since it was working before and now it's not but nothing showed up in the window. As for...

The tech I spoke with, Colt, (really nice guy) was going back and forth speaking with (what he said was) their top tier guy asking questions and this answer came from the top tier guy. They said that if trying (several more times) did not work, (since they do not sell repair parts anymore) the...

Well I finally spoke with Tech Support at Signature Solar and unfortunately the only advice they had for me was to just try over and over to update the firmware. They said they had another customer that it took (I think he said) 17 times before it worked. I really don't understand why it would...

I finally tried to update the Firmware on my 12kw. I followed the instructions meticulously but the update did not work and now it will not recognize the Solar input at all.

Just sent an e-mail to Tech@signaturesolar.com. We will see what happens.

Well, I have continued to have this problem randomly over the past several months so I finally tried to update the firmware. I followed the directions meticulously but the firmware update failed. It eventually timed out and once I got my inverter restarted, now it will not recognize the solar...

First of all, when calculating voltage, you have to use the VOC (Voltage Open-Circuit) number. Second, you have to compensate for temperature. The VOC shown on your solar panel is at the Standard Test Condition of 25C. As solar panels get colder, they will produce higher Voltages. Here is an...

The Growatt 12KW Split Phase Off Grid Inverter | SPF 12000KT DVM-US in NON-Stackable. You cannot connect two of these unit together.

Assuming the temperatures will not get colder than -40F at your location. For (36) panels, I would use (3) strings of (12) panels in series. This will use (3) of your (4) PV inputs. If you wanted to max out your Growatt, you could add another (12) Panels in series to the (4th) PV Input.

Charge Controller or Solar Charge Controller (SCC) - Is a component (or part of your All In One unit) that takes the input from your solar panels and controls and regulates the voltage and current to charge your batteries.

I would feel more comfortable knowing exactly what model of panels you have or seeing a picture of the electrical specs sticker on the back of one of the panels but if your VOC = 36.0V and your ISC = 9.0V and if you have the Growatt 10kW Grid-Tie Inverter | MIN10000TL-XH-US then you have 4 PV...

More information needed. What is the Open-Circuit Voltage (VOC) and Short-Circuit Current (ISC) of your panels. Also, I do not see how you can get more than 15A from a 3S 250W panel. I would expect the ISC on a 250W panel to be somewhere b/t 8.5 and 9 Amps. Remember when you put panels in...

Keep the 3 strings separate. I see no advantage to combining them and it might mess you up. Can your charge controller even take 850V input? Can it actually take 425V input?