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This is work nicely. https://a.co/d/4bD0uME

I think it would have to really drop.... I'll test that out.

Oh yea, of course! geese.... I'm an idiot today.

Sweet. That's what I was hoping someone would say. I wasn't sure. I'll assume it's the RED one. :)

I can login to the BMS but not the charger. It is not smart. What I'm hearing is ... it charges. It's done. It doesn't have enough info from the Shunt to know to charge again.

I know I'm chatty today. I launched the app to get into my Overkill BMS and boom! I could see my neighbors battery... and mess with it... if I wanted. I adore my neighbor. Never happen. But... you can't put a password on these things. I mean, some kid at the campground could seriously mess up...

Nice, I had that same thought. We'll see how far the rabbit hole I want to go... I'm going to silver lining this... 1. Don't panic. 2. I've built a relatively simple robust system. As LifePo4 goes. 3. The fact that my batts will go down until I decide to charge them again may actually extend...

Well, my trailer just sits plugged in and it's ambient draw, at least according to the Camway Monitor is about 1/3 of an amp. I have 2 termostats constantly running. 1 blows warm air into the plumbing area. 1 turns on the battery heater pads. Although calm now, I wonder, if I should update to a...

Thanks for the replies by the way... ok, I did more sussing. My fluke at the battery says 13.3 What I DID do differently is I unplugged the charger and WAITED until the green light went out. Then I plugged it back in and Voila... it started charging. Maybe the EG4 is just designed to "Float"...

I just thought of something.... If I put my meter on the battery directly...

Yes, that is my tendency...

Yea, that's it. I've unplugged it and plugged it in. It just has solid green. I think indicating that it's charged. But unless I'm reading something wrong they are not. Shouldn't they be closer to 3.5v? 14v total? So it should "Float"? EG... keep the batteries near full? So you charge yours up...

I finished my setup. Schematic attached. I thought I had this answered in my head but apparently not. According to my Battery Monitor/Shunt I'm down to ~80%. According to the BMS I'm down to ~70% ( See Pic ) I'm reading that... unless I have a smart Charger... my EG4 30 Amp Charger won't...

Hiya. I successfully? use the forums to program my Epever 40A MPPT with an MT-50. I think. By the way the MAGIC TO MAKE THE MT-50 work that I think people miss is.... you may see TWO params on each screen but you want to hit SAVE after each one. This allows it to do its math under the hood in...

moved.

Hiya! I bet you get a lot of these... and I posted this before but this is prettier and based on input from the forum. \ Questions. 1. I will be putting bolting the 30 AMP charger + and 40Amp Charge controller + to the same spot on the MRBF Terminal Block. OK? 2. I switched the Batt Cutoff...

I slept on it and I think I've answered my own question. The metal box has to go. I'll remove the tape mounting the BMS and replace it with 3M VHB. Then I'll cut and mount custom angle iron on the bottom of the wood ends of the pack. I'll secure the pack to the oak floor of the RV with 1/4...

Nice Catch! Thanks! 1. Troy called me from OverKill... Ummm... You have to turn it on in the software. He he... All working. 2. Now about the heatsink thing. I Waaaaassss going to mount it in this sexy stainless Group27 box I found... a. Since I have silicone heating pads under a metal...

Awesome suggestions! I'll try them out and report back. Might be a day. Yea, I'm doubtful it's the BMS since it's the best money can buy! OverKill all the way! I didn't realize the exact terminal needed to be that precise since the terminals are connected with a busbar and the diagram I...

Brand new cells. Top Charged and Capacity tested. That thermostat draws nothing. MilliAmps. I may be new to this but is sure feels like the BMS is bad. Since I can power the thermostat (Load) if I just connect it to the battery without the BMS.

Oh man. So sad. Is my BMS busted? 1. When I put my Meter on the + and - of the pack I get a lovely 14.x volts... 2. When I put my Meter on the + of the pack and the - of the BMS I get 13.1 3. If I attach my little thermostat control to a regular old AGM battery it turns on. 3.5 Update... if...

Awesome! I love this group.

Let the festivities begin! Out with130lbs of Tongue weight and Lead Acid!

Wow! Thanks everyone! I thought of another simple strategy around the idea of manually mid-leveling. I really don't draw that much. I could just put my charger on a timer and have it shut off after eh.... 5 hours... not sure... then just watch my battery monitor and charge up the batts again...

I think that is the problem. My charger cannot be programmed.

I like your world view here. So, if I let go of the 90% thing. It just means the batts won't last as long right? Keep in mind that I was planning on keeping my trailer plugged in... as it sits in my driveway under a cover 90% of the year.

Sweet! That is the concept I was missing.... diodes. I have limited understanding of circuits, Open, Closed, Diodes are like one way things, Transistors are switches/valves, resisters resist, thermistors... Ok I know some stuff but now all the theory. Soooo.... in my configuration... the only...

Oh, so the BMS is acting like a diode and only allowing power to flow in the discharge direction?

How much should this bother me?

Just goes to a Camway Battery Monitor. My underrating is it measure power going in... power going out. BINGO! That was my next question. In my setup what DOES the BMS actually do? Is it able to balance the cells when charging? I see that as a setting. But I have no idea how it does that with...

Thank you! I think I get it. So in my design it's really up to the charger to stop the charge. My EG4, although rated for LiFEPO4, is not programmable from what I can tell and so I can't tell it to stop at 90% SOC. But it will float at that point... or is smart enough to back off. I can...

See this basic setup. How exactly does the BMS stop the charging process? It's not connected to the charger. Did I miss a component? How does it tell the charger to stop? Is it able to tell the cells to stop accepting charge? Keep in mind my RV will be just sitting plugged in to shore power...

So you look at this curve and the exact numbers are guess work? I mean how did he come up with 3335 for 80%... You're right. this is all I really saw in the PDF regarding anything like percentages.

In the interest of understanding... I have an OverKill 120A BMS and 4 280AH EVE Cells. I got the pack all built. I'm working on understanding and configuring the BMS. Support at Overkill gave me these values that they got from the Cell Spec Sheet ( attached ). I just want to learn here... How...

Top Balance went well. It helps that I sprung for a Fluke 107. My Radio Shack multimeter from the early 90's was way off. Reading too Low! Now I'm doing the capacity tests on each cell with the "Hawk" gizmo. Seems to be going well. I set the low voltage cutoff to 2.6. I'm at ~22 amp draw. It's...