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The system has a separate "shunt" for the AC current readings, which are the previously mentioned sockets.

If you're relying on the BMS to give an accurate SOC%, that's not going to happen. Is the voltage the same on both batteries? Are the loads showing very close to equal? If so, the settings for % may be slightly different. Use the Overkill Solar battery app to see more detailed settings.

50A max charging? That's going to take a while to recharge...

What kind of heater only takes 4-5 amps DC? More likely, it's 4-5 amps @ 120VAC, which is 37.5-47 amps @ 12.8VDC.

I do not see an issue. Use the battery as intended (maybe you'll be missing out a few AH to begin with). Over time, it'll balance out.

Depends a lot on the efficiency of the AC and ambient temps. Rule of thumb is usually you get about 1 hour per 100AH (at 12V) for running an RV AC.

I haven't opened one up, but I have two of them in my Class B van. I can also attest that the low temp protection does work (batteries were at 32 degrees this morning)..also, it's using some version of a JBD BMS and the Overkill Solar app works.

I have two of them in my van. They work as expected and have been great so far.

Do you have a shunt to show your idle amperage draw from the batteries?

I saw the Li Time but I don't think the 400+ AH versions have internal heating pads. My van currently has a 2K inverter, but I may upgrade to a 3K in the future.

What are your settings for the shunt? Sounds like your charged voltage may be too low.

The internal BMS is not accurate for SOC% as it looks to be voltage based.

With some of these batteries, balancing can take some time. A similar situation happens with other brands, including SOK. Here's a good thread to reference: https://diysolarforum.com/threads/brand-new-sok-206ah-doesnt-seem-to-balance.42789/

Just saw these and it's pretty tempting to grab two of these for my Class B van... How long until Will does a teardown? :unsure: https://www.us.sokbattery.com/product-page/12v-280ah-lithium-battery-built-in-heater-and-bluetooth

I was unable to capture the BMS model number. Would you mind sharing here if you get a moment? Thank you.

Something seems off with the wiring. The DMOS is still enabled, but the battery voltages aren't the same. If connected properly in parallel, they should be the same voltages..

We've had 2x 300AH essentials in our Class B van since December. No issues at all.

I've been running 2x Epoch 300AH batteries for a few weeks in my van. No issues or concerns.

The BMV-712 is simply a monitor. The discharge floor is used to calculate when the batteries reach "0%".

"I look down at the phone apps and see there is still about 500 watts of A/C power coming out of the inverter..I do not know the condition of the water heater as it’s not visible what it’s doing easily." But it didn't shut down the inverter if you still have power coming from it...

What build of Android 13? I have a cheap phone Orb 5G with Android 13 and the Overkill Solar app works just fine...

So you plan on running the inverter at maximum capacity continuously? You're going to get less than 1.5 hours of run time...

The main reason I'm looking at them is because they have a 12V "560" AH battery in a relatively small form factor. I'm pretty constrained on space and outside of a DIY, that battery would be the most capacity I could fit in a small space.

TL/DR: Is there a way to make a shunt read 1/3 of the current passing through it? Background: I have a van with a control system with an integrated shunt and EMS. The system is hard programmed for 200AH of LiFePO4. I've upgraded to 600AH. The manufacturer says they will not support...

As long as your shunt settings are correct for LiFePO4, I would trust that more than the app readings.

Has anyone been successful with resetting/restarting/etc. within the SOK BMS? I tried clicking it, but it wouldn't take... I had an overcurrent protection.

From the manual posted on their site (https://www.us.sokbattery.com/file-share/aa0b8eae-692b-4a63-a612-a64e97ae52d7), it looks like it turns on around 32F and off at 41F.

For some reason, I was thinking Victron prices were higher. My mistake.

Off the shelf? Probably Lithionics.

I'll suggest again, you need a shunt.

This has been my experience, as well. The ABC app is very inaccurate, unless you fully cycle both batteries very frequently. What I usually look at is to make sure they're both charging and discharging at close to the same rates.

Yes, the SOK has a 7 year. It's listed under Description. https://www.us.sokbattery.com/product-page/12v-280ah-lithium-battery-built-in-heater-and-bluetooth

I didn't measure the length afterwards. But, I do recall the interior width of my battery box was approximately 27.5" wide and I have two of them side by side longways.

I have the basic version, no comms.

Are you close enough to the battery? Maybe there's something wrong with the Bluetooth dongle...

Then it sounds like you'll be just fine.

Reach out to them on Facebook. That's how I've got all of my responses and in a timely manner.

Good afternoon, everyone. I'm in the very beginning stages of planning my build. I have a 2019 Fleetwood Discovery Class A motorhome, which is pre-wired for solar (10 AWG from the roof). I have already purchased 2x SOK 206AH 12V batteries, but I plan to purchase two more eventually. I plan to...

What shunt do you have? It should allow you to customize all of the parameters to your setup.

If you're having the same issue with multiple devices, the common denominator is the battery/Bluetooth module...

No, that is not what I'm trying to do. I am not changing any loads at all. I have simply increased the bank size to 600AH and want my system to read the SOC% correctly.

Which BMS is it and where did you get it from?