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I thought you were kidding me, reading this the first time, but it looks like you are right here. Even with an electromechanical relay it's not guaranteed that both circuits are always separated from each other, although the separation is galvanic. It seems to depend on the construction of the...

OK, so I'd probably have to out calculate the taxes and fees. Thanks

Are these US prices or already AliExpress prices?

I think, that should be the right question to ask. How expensive should an electromagnetic DPDT-Relay of neat quality be that would handle at least up to 10A? In my life I've already bought some different things directly from China and not everything was crap. My 3x100w Enjoy Solar...

Following the thread I'd say, it's the same crap?

I don't think this all will help to bring forward the discussion here. I'm very thankful to every constructive help I can get, and I think it is only human to look at every new information critically first.

This is a really nice product. Unfortunately for my approach it's an absolute overkill. I mean, this one's very good for an offgrid-house with a big solar-system installed and the necessity of having AC power 24/7.

Fortunately there's still enough time to make a decision. From my understanding most of the nay saying voices here were around the Chinese module from the first post or/and its cheap transistor relay. The electromechanic relay looks to me being of a better quality. Of course I'm still missing...

I've just seen, there is a little controlling board at the front-side of the box which produces the signal and a timing delay. I haven't seen any electronic parts for a buck converter (picture inside english manual), but I've read in the technical specs of the relay on AliExpress, that the...

I've looked into it, and watching the one for 120VAC I've seen a simple DPDT relay installed: https://www.progressivedyn.com/rv/automatic-transfer-switches/pd5110010-120-vac-30-amp-automatic-transfer-switch/ There seems to be nothing more inside this plastic-box. I've found a lot of very...

Looks like I have to research something else, thanks. If I'd decide to use a relay or contactor for this I should prefer a DPDT electromechanical one, this could solve some of the mentioned problems by design.

That's one of the reasons I'm still not sure about it. My system is limited to 10A, so I'll never push the relay to its limits, not even half of it. I'm also very often offgrid, so the relay would last most of the time in its NC state passing the Inverter. I've researched for other DPDT and...

ok, thanks

Failed in a manner they didn't switch anymore, or did you get a short circuit?

Hmm, what am I going to protect at this place? The shore system is protected on its own and the Inverter itself should be, too. I don't know if the Inverter has a protection at AC side, but at least it must have one at the DC side. What happened?

I've got a 1 Phase 230V shore system installed, secured with a RCCB and a MCB at 10A. When it comes to the Inverter, I don't know yet, but it should be something about 1000-2000W and a pure sine. The relay you can see on the board can be found on many different module-boards on AliExpress. So...

Searching for a proper transfer switch allowing me to switch between shore power and inverter power and which depends on shore power available, I found this on AliExpress, which should handle 220VAC and up to 30A. https://www.aliexpress.com/item/32837077765.html The working principle explained...

That seems to be the correct common port model. I've ordered exactly the same model from the official Daly store and my common port BMS also has the three connectors. It looks exactly the same as on your photo.

There are not temp problems yet, and there also is no need for a cooling. When it comes to the BMS, the Daly BMS has two heatsinks installed by default, one from each side. One of them now is outside the battery-box. But I did it because of space-problems, not because of cooling problems. It's...

Hmm, I don't know if i can follow this all, but by now everything is still in 3D development, so there's nothing going on making something at the workbench yet. I'm also still missing some parts that are either not bought yet or in shipment. Many dimensions I got are just taken from the...

That's exactly the reason why I haven't tried it out yet preferring to ask here first. My BMS was a little bit expensive to do these kind of experiments. Maybe if one could approach starting with lightweight loads and rise by round, than maybe I could risk placing the bet on the table :cool...

Yeah, I though of this one, too... or at least a similar, but somehow I was confused about the technical specs telling me, the auxiliary contact could only be at 24VDC or 48VDC. I also got into trouble with the limitations of the battery-case dimensions. Now even the BMS needs a breakthrough in...

Hi, I've bought a BMS without low temperatur cut off and found a way to control this through the use of external controllers. My problem is, I would need an expensive normally closed (nc) relay to get it all work. This would cut off the current under certain circumstances. I don't want to go...

Ok, it seems I'm stuck here for now. Relay is not an option jet, nevertheless if its a classical relay, contactor, solenoid or SSR. It's just to expensive. Another BMS is not an option jet. There is not much on the market for now with a low temp cut off, and I need 200A. Installing two of them...

This one seems to be even programmable. I think I have to take a look closer into it, thanks.

Ok, I just found this: 400A: https://www.aliexpress.com/item/4000295716219.html [NOT NC] 200A: https://www.aliexpress.com/item/4000295498163.html [NOT NC] Didn't know there are so big SSRs. They should be able to handle any in-rush current, and they aren't very expensive. They also should have...

Any idea what else can get the job done? Should I combine some smaller SSRs, this might also work?

Looks like my idea has stuck at the costs. I couldn't find NC-Relays for about 200A permanent load so I researched contactors and solenoids. Which I could find, but they are to expensive. Looking at the cost I could just sell my BMS and buy one with low-temp cut off included. Just to fulfill...

Yeah, this looks fine. It' s one of the better known Daly's (12V 4S 200A common port) https://de.aliexpress.com/item/32921950553.html. It should have high/low voltage cut-off and high temp cut off. But looks like it is missing the low temp cut-off.

Yes, that looks much better, I just want to have the power-line which is going to the temp-controller attached next to the battery-poles. In your drawing it would be the plus very right of the relay and the main switch. This will force to power the temp-controller by the charger when the relay...

When it comes to power consumption I made some scenarios with data I got from the informations found around the components itself. These are NOT results of measurements. All these scenarios are meant according to the described wiring diagram. TEMP beyond freeze | no charge current | powered by...

I see, I have to start a bit earlier. In this post I described all used components and linked to them: https://diysolarforum.com/threads/lifepo4-heating-pad-for-cold-temperatures.5/post-32925 The pads does not have their own temperatur control. The two controllers are meant to handle this. The...

This is just a first try I made on paper to make it faster. Some final decisions are not made jet, e.g. the main switch could become rationalized and exchanged by a smaller one just switching the signal for the relay. By now I also don't know if it's not better to contact the power supplies (+...

Ok, I'll do, but this may take a while.

Yes, a failure could be an inside broken pad, once heating it too long, this might happen. But normally it doesn't if the selected material isn't planned to weak. (planned obsolescence?) When it comes to the pads I'd like to have, overheating should no be a problem, even without a thermal...