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I've created a BMS and am looking for feedback. I am trying to figure out what to do with this. What should I call this? Do I provide the stuff as a DIY? Do I do some more to make proper packaging and sell it, or both? How can I improve the connectors and mounting and what additional features...

Continued... Assorted: It has a speaker on it, so that it will beep if it told loads or chargers to stop, but it senses current in that direction. It will also shoot an email off, which can be something like yourphone@txt.att.net to shoot an sms to your phone in that emergency condition. At some...

I thought I would throw my 2 cents in with respect to MPPT, PWM, and DSSR20. PWM is necessary for lead acid batteries. PWM is not necessary for lithium. Lithium needs almost no circuitry between the battery and the panel and therefore the DSSR20 is the right solution for lithium. Simpler is...

I don't see why these are bad cells from Basen. Charging a series pack without a BMS is exactly how you wreck a cell or two. Balancing the cells only squeezes more capacity out of the pack, it does not somehow relieve you of the need for a BMS. The problem is that the cell voltages go...

I have researched more regarding the High Frequency vs Low Frequency and feel that I can spot them without trouble. If it is square in 2 of the 3 dimensions, then it might be a low frequency unit. The low frequency transformer is a big heavy doughnut that demands a square section. If the thing...

I have purchased the SBMS0 and 4 DSSR20s (16 12v 100w panels 2P2S 4DSSRS). I don't like his WiFi solution though. It is an access point, which would be cumbersome to the point of useless. I would have to disconnect my phone from wifi, then connect it to the SBMS, then reverse that whenever I...

Thanks, I was hoping you had found an aluminum versions of this. I can cut the aluminum threaded bar, but that's a lot of fiddling. Maybe I'll do the bolts.

Right, but the problem is how to determine that you will gain anything that makes a difference to you. I live in Seattle WA and I have a 36' RV. This is exactly the situation that begs for an MPPT. The panels at the front will be nearly 50ft from the original battery location. I can fit 2kw of...

Circled is the maximum difference between the sum of cell voltages and the pack voltages measurement. This tells me I have lousy connections to the batteries on the busbars.

I am aware of the difference and paid no attention to modified sine inverters. Yes, I agree. I read that article the first time you posted it. My last post was comparing a 3kw LF to a 4kw HF, which are somewhat equivalent in their surge capability. Oh, I see the issue. The EDECOA is NOT a low...

I am reviewing the Samlex, Magnum, and Victron offerings in order to understand the difference between low frequency and high frequency types. I hope to have a rough guideline for comparing the surge ability thus a rule of thumb to adjust their wattages (e.g. maybe a 3000w HF is similar to a...

I have an SC-2030 and TM-2030 for the past 3 years. I have 4 AGMs. I went with Bogart because, as they said above, they do "amp-hrs counting to determine endpoints ". I would also suggest to Bogart that they provide signals from the TM/SC that can be used to shut off loads when the battery gets...

This discussion is rather goofy. "external devices" is a bogus concept. ICs soldered onto a PCB were "external", but once soldered they are not? Why? Many different companies are involved in supplying the components that are brought together. I see no reason to trust the IC maker of some FETs...

I appreciate LukeVader, mndare, and KauaiMolokai comments on the UPS, vs sea DDP questions. That is all good information, thanks. I wonder if there is a difference between Canada and USA, and the current virus situation that may explain the difference between the two different experiences...

Software: The screen shots below show it in action on my 24V RV setup. I am using it for real, although it better not get below freezing tonight because my Temp 1 thermistor is BS. If you pay attention you will notice that I have not implemented the stuff to do the balancing. You can click on...

I should thank Stuart Pittaway for his DIYBMS project. That project gave me a huge head start. This uses his idea for using the attiny for monitoring individual cells. However, note, that even though they have the same general architecture, nothing is compatible between the two. I used the...

I think the choice between MPPT vs PWM is all about the wires, and not about efficiency. From http://www.bogartengineering.com/support/faq.html if you can match the panel voltage to the battery bank, the only situation when the MPPT beats PWM is in rare situations (low temp, low battery voltage...

I am confused. What is the Xantrex? A solar charger, or a meter? The trimetric should show the amps, regardless of what chargers and loads are connected, as long as the trimetric is properly connected to the battery and shunt, and that the shunt is the one and only thing connected to the...

OK, my bad. I will accept the correct belief system. BMS's must have large amp mosfets to be able to shut off the current, because loads and MPPTs should not have simple on/off switches that can be trivially controlled by a very low power relay. Chargers should control the charge because a BMS...

What model is the Samlex? I assuming the reliable one is a high frequency type and am hoping the Samlex is low frequency. I am hoping I can get some feedback from your experience to confirm or deny my impression that the low frequency units of similar wattage spin up motors faster than the high...

After much searching I concluded that there aren't a lot of good reviews. Almost nobody plops an oscilloscope on these. I had 2 choices. 1) A LF 3000w 24v 120v inverter/charger. AMPINVT $600 -- EDECOA $220 -- one reviewer showed how his computer and tablet behaved like crap with this. I...

So what are we concluding? I am putting 8 280ah cells in my RV. They will be in the living space. I started building a box to stack them up vertically. With 2 side by side the narrow way on their sides. But this thread suggests that putting them on their sides is not the best. The trade off is...

Order placed on 4/8/20 via sea, and they arrived today. I assume the virus is slowing customs in particular, and every change of carrier in general.

Oh dear, I have no clue where to start. The general concept is that you'll install a development environment. I use visual studio code (vscode) with platformio. You'll create a project from the plaformio home screen within vscode. You'll choose the esp32 as your hardware. I use the arduino...

Yes, I wanted more juice than low, and the big ones are expensive. Plus they throw all sorts of features that are unnecessary when you have something like the Electrodacus SBMS0. I don't need any remote control on the inverter, nor any readouts from it. I just need remote on/off. The BMS will...

Close, but not quite. The 8266 is a smaller and cheaper one that has fewer io pins. I'm using an ESP32. Specifically this one that comes with some stuff to make it easy to plug the usb cord into it to program it. Note, that this isn't "wifi hardware" so much as a microprocessor that has many...

OK, I see. Thanks.

You might consider the Electrodacus BMS. The current does not flow through it, so the size of the panels and loads etc don't matter. However, the inverter and chargers need to be able to start/stop from signals from the SBMS0. This seems to me an excellent choice because it allows the panels...

I just tried it without the antenna and it sucked. After paying attention to the different WROOM-32, I now understand that the 32U does not have the PCB board antenna, but it does have the u.fl connector. I just bought this one which has the WROOM-32D which does have the pcb antenna. I am...

Agreed. I am going to mount mine in the water bay and keep them upright. This requires that I make an aluminum frame to suspend the batteries from the ceiling. That will not only free up the space for other storage, but will put the batteries next to the moderating temp of the 110 gals of water...