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Apart from resistive pads, I have been looking at a heating/cooling system based on Peltier elements, it should hopefully be more efficient than resistive heating (the Peltier element basically acts as a mini heat pump), plus it can do both heating and cooling in one shot to also help keeping...

Some feedback on my side for the 16*150Ah from BLS that I could capacity test last weekend: Same as you @Stupid Monkey, took really a while to charge, and because I just had 48h to do the whole charging + discharging + charging to storage voltage I had to cheat a little. The cells were at...

Hi there, As there are many tools that already exist to size autonomous PV installation, and that I came across some of them, I thought it would be nice to share them here. If anyone knows some others that are nice don't hesitate to add to the list. Maybe this thread could gather diverse online...

Let me disagree here. The BMS is here to allow or forbid charge and/or discharge. You can do it the hard way with relays, this way you physically open the circuit and you are sure that no current can flow anymore. But you can also use the function of many inverters, chargers and SCC that have...

I can say a word about some experiments I did with Peltier modules some time ago. I wanted to do more quantitative measurements before reporting but didn't find the time yet so here's already some qualitative feedback: I used 4 Peletier modules (TEC1-12706) wired in series and hooked to 12V...

I agree with you, it's great that Will could make it work properly, and apparently for that you need a specific "enterprise" version to set everything properly. I don't have an Android phone around nor the BMS so it's hard for me to fully test all this, that's why I'm very much looking forward...

I've just ordered this driver circuit and this latching relay to use with the Chargery BMS (at least on the discharge end, charge signal will be directly hooked-up to the inverter-charger). If background consumption is an issue for you that's a nice potential solution, the latching relays don't...

Maybe you're already aware but a remark about charging LiFePO4 with an alternator: it can go wrong if the system is not made for it. See for instance where they explain what can happen if the alternator is inadequate and how to prevent the issue. I didn't get all the details but I believe the...

Also just could buy 16 x 150Ah from BLS after a week of AliExpress verification process... Let's see when they get there! As for the BMS I'm more and more decided towards the TinyBMS without external relays to begin with, the good thing it that it can be upgraded afterwards. But I guess I have...

Are you sure that the caliber of the shunt does not impact the precision of its current mesurement? It's my understanding that a "x A / y mV" shunt is basically a very low resistor that will provoke a "y" mV voltage drop when "x" amps go through it. As the relationship between current and...

I posted something like that here: https://diysolarforum.com/threads/need-smart-bms-as-replacement-for-shunbin-pack.2046/post-40824 If something is unclear or looks wrong please tell :)

Oh alright if it's the case and the enterprise app unlocks all the settings then it looks great, I lost sight of that.

Hi @solardad, indeed I've briefly tested this driver circuit + latching relay, which worked as expected. All is explained in the datasheet of the driver circuit as for how it works and should be wired. Basically the driver circuit transforms the ON/OFF signal sent by the BMS (Chargery or any...

Wow thank you so much for this revelation @FilterGuy, I was already thinking about crazy mono/bistable relays combinations to try to get an automatic pre-charging circuit that would deactivate itself on its own an leave the least relay coils powered while running ><, but definitely after reading...

Actually they do, you can find how to set them up like this (2 input control signals) here. EDIT: That's at least for the Multi and Quattro devices, you have to check for other product lines. Also beware, you need to buy a special connecter to connect to the inverter to be able to configure it...

The main unit is generating some heat, especially when balancing, but I guess that if you do a perfect top balance of your cells on your own and only perform occasional balancing on your watch while disabling the balance function of the BMS it would not generate so much heat.

Wow thanks for all this already, this third BMS looks super promising! You're talking about an 8s version of it, but where can we buy it? Batteryhookup seems to only sell the 4s version yet. And what about a 16s model?

Great news for this low temp cutoff! Thanks for the exchanges you had with the manufacturer and the very prompt improvement of this BMS! I just ordered it then, I was hesitating with the TinyBMS (which had low temp cutoff from the beginning) but now that Chargery caught on, and considering the...

Maybe this blogpost by Victron and the Excel sheet attached to it can help you, it did for me: https://www.victronenergy.com/blog/2014/03/28/matching-victron-energy-solar-modules-to-the-new-mppt-charge-regulators/

You should be fine using this 100mV/200A shunt to measure currents up to 150A, because I this case the shunt voltage measured by the BMS will not go passed 75mA. If the shunt voltage measurement circuit of the Chargery BMS is capped at 75mV then going beyond this value exposes you to misreading...

Thanks for the 16s version! However these specs don't look so nice regarding the low temp charging cut-off. It seems to cut at -7°C for the warmest setting and it cannot even be changed by the user... I would prefer to have it set at 0°C at minimum and rather +5°C. But hopefully Will's test...

I would expect that you can always put battery banks in parallel (after matching their voltage) because they will then experience the same voltage and will be "synchronized", the same way you can put cells in parallel without any need to monitor their individual voltage (because it's the same...

Hi all! Here writing from Paris, I got sucked into first the DIY solar system trend and now the DIY battery community after starting watching Will's videos a bit more than a week ago. Very interested about the technicalities of all this and the potential it starts to show to tackle the global...

Indeed, then I would like to try to explain my point further, as we did not understand the same stuff from the posts 71 and 78. Whichever the resistance of 2 legs of a circuit (even if they are very different as in this case), the total equivalent resistance of the circuit comprising the two...

Still haven't built the sysytem, but some parts arrived (although only 8 Peltier instead of 10 ordered... figuring out with the AliExpress vendor in progress).

The REC BMS looks like serious stuff too although I didn't dig into the specs and manuals. Maybe you've seen they are compatible with Victron GX stuff via CAN, and it seems you're looking for that. I had in mind they are quite expensive and looked more targeted towards pro setups but I don't...

Just came over this video on YouTube: It seems to be the 150Ah cells from BLS, they at least externally look very much the same.

They were ordered just at the end of December so I'm still impatiently waiting for them ?

If you want to run thousands of W on a 12V system you will have very quick hundreds of amps going through... So I believe you should go directly for a BMS commanding relays. The 123 Smart BMS is made for that, like the Chargery and the TinyBMS. Price wise the Chargery is the cheapest, but might...

Hi Rocco! I'm also building a LiFePO4 battery that will function with a Victron setup (EasySolar). From my research it seems that the only batteries and BMS that can fully communicate with Victron equipment out of the box are listed on this webpage (it seems to only be batteries though). As far...