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Oops... sorry I didn´t read it all. I thought you wanted one 24 PV panel with two batteries. Sorry for the confussion. It should work as you said, but I am not sure what will do the MPPT with an almost plain voltage curve. I supose you can switch the MPPT off in order to no interfere.

Hi. It is suposed that it is the intended function of the 75/15 as long as you use the "batt" terminals for the connection. Another question is if you use more than one single bat and each one is of diferent capacities, or even more important if each one are of different technologies, since the...

Maybe late, but this thread can be interesting for some of your needs: https://diysolarforum.com/threads/solar-radiation-meter-reasonably-priced-do-they-exist.34247/#post-430719

Izmail, Interesting topic here. I understand that the "light bulb method" sounds today as arcaic and obsolete (in fact, finding the bulb itself can be a dificult task if you don´t have in your garage a surplus case full of old stuff ;-), but a more sophisticated and complicated system is not...

I have been thinking in the same idea since 1 month ago. In my case, my interest is running the heat pump for "free heating" the house. Since my system is a grid tied inverter with zero injection to the grid, I must keep an eye continously in the amount of irradiation to decide if turning the...

Here in the European Union, people is talking actually more and more that a great grid shut down is coming soon (long enough: several days afecting several countries). Because geopolitical reasons, the supply of liquidfied gas used for the generation plants (comes from Russia or Argelia ) has...

The problem is as I already mentioned, to switch the positive side of the circuit. The MOSFETs are quite good to cut the negative side since in such position they are easily drived to saturation (and therefore in to the ultra-low resistance state we want). But doing it in the positive branch is...

It is true, but 99,9% of the BMS in the market are subject to the same failure in "on" state

the problem is that most of the available products control just the negative side (ground path) (as almost all the BMS do) and although it is posible using it, I would prefer to control the positive side and make a common ground system (just for simplicity and safety)

you are absolutelly right. I should have seen that , but I ignored the "protection diode" path since the protection function is not needed here.... :cry:

thanks. The original question was: Will it be acting as a relay if the ground wire is just disconnected?

this is hundreds times less that using a normal diode (even if using schottky diodes that are the lowest loosing diodes). In adition, a contactor has not much lower contact resistance....

15 USD https://www.aliexpress.com/item/1005001754217405.html?spm=a2g0s.9042311.0.0.ba144c4do8Eiwa

Hi. Have someone here experience using a "Ideal Diode" commanded as a relay? I want to use it as a commanded switch (instead a contactor) since it has ideal performance for high current (more than 200 Amps and a incredible low loss due to the ultralow internal resistance (0.4 miliOhms). I plan...

Thanks all for the help on my desk. Your opinions and experience are very valuable and really appreciated. Following the clue from @A:Justice, I took a look at the CHARGERY website and they have EXACTLY what I need: a professional BMS with separate display, external shunt (up to 600 A), smart...

That is exactly whay I would like, specially because the cut-off is symetrical (same current in charge and discharge). The issue here is how to drive the relay . Maybe using the gate signal from the power Mosfet to drive a smaller one driving the coil? Yes, very good point ! Sorry for the...

Hi Mistersandals. Sorry for the confusion. No. The brand of the inverter is "NAT Power System" RP series, pure senoidal wave low frecuency (toroidal transformer). It also has 75A charger and is fully parametrizable via LCD display, even with "user defined battery" option. Has a "transfer relay"...

The 3 answers are really contributive, and makes me sure I have to think more about. All your sugestions are good points to take into account. Remember that we are talking about a VEHICLE (so, 24 V is not suitable) The problem with the Hi AMPS is that a reasonable 250 Amps BMS will only admit...

Hi pals. This is my first post here. I hope not repeating any already discussed matter in other threads. I wonder if someone here has tried the following setup: 1- Using a low amp BMS (60A for instance) connected to a 12v 300Ah LIFEPO4. That BMS ONLY would feed current to the low amps loads in...