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thanks for all the details. I also think that a dedicated relay introduced also new problems and is also not that cheap, I guess the bluetooth sensor might be the better solution then.

unfortunately, do you know why? I think it would be quite useful to use it as well. Of course the temp sensor can't be super accurate as the controller also emits heat, but it could turn off at e.g. 5 degrees.

have you ever tried it, because the internal sensor of the Victron MPPT is not used, at least I couldn't trigger it. See also my test in

did you use the power supply for other use cases, so that you know that it works? You might have a loss on the connections but I doubt that it can be that high. If you do not have a clamp meter, usually cheap multi meters can also measure current when putting them in series (but check in the...

I always try to design a system open for extension, therefore, I recommend to start with a MPTT controller. You can start with two or even one panel (second hand) and a cheap lead acid battery. Later you can still upgrade the panels or the battery to LiFePO4 without changing everything and all...

It really depends on your load. If the inverter is your main load, I recommend a higher voltage and LiFePO4, it is just more reliable and on long term LiFePO4 is cheaper. You can also buy a cheap step converter (~15€ on Aliexpress) from 24V to 12V to use 12V appliances. 24V is more expensive as...

I would consider a 24V system with this requirements. With lead acid you need more than one battery anyways. With 24V you are also more flexible and can use a smaller charge controller, no need for 100A (e.g. the victron 35A can handle up to 1000W PVs in a 24V system).

just some wild guesses: the CC (constant current) led is on, right? usually CV (constant voltage) makes more sense. Have you double checked if the shown amp is the max or the current flow?

just to prove that there will be current flowing if the voltage is different: yup, I encountered exactly this yesterday. I found this page https://diysolarforum.com/ewr-carta/topbalancelfp/ which describes the passive/mid balancing for new cells that are matched. I trusted the page and tried...

thanks. that would be even better, to have the bluetooth sensor and the internal one as a fallback in case the bluetooth connection fails.

thanks for the hint. so the internal sensor can be used for that? I will try it out and test it...because this would be sufficient for my use case I guess.

you mean increasing the power of the panels, like having 3 panels 300W each? Of course, that is not a problem but you have to make sure that all components can handle the current/voltage. If you have more panels you will need a bigger charge controller that can handle it. Btw, even if you have a...

regarding sizing I can also recommend the video

Hey, I am currently building a very similar system. I also did a video about my design process (more to come) In general, it really depends what budget you have. I would suggest a MPTT controller to be flexible in the future in case you want to change something (e.g. the panel or number of...

you are right, it is not that expensive. It just looks expensive if you compare it to a simple temp sensor on a cable for 5$. For my use case I would like to have a bullet proof solution as at it up on the mountain and it could happen that there won't be anyone for weeks or months. As a software...

I second that, the difference between mono and poly is not that big and sometimes poly perform even better under certain circumstances. If you have a MPTT already, you can also hook it up to your 12 V battery and the panel to quickly test it before buying it.

I am using a daly bms without low temperature cut off. The victron charge controller has a built in temp. sensor but I would like to have an external sensor option. The victron bluetooth temp. sensor is quite expensive and I do not trust bluetooth that much for such a crucial function. Do you...

I justed orded 120AH cells from https://www.aliexpress.com/store/5403069 and I quite happy with them. took around 7 days, packaging was very good and the have warehouses around the world, so you do not have to deal with taxes and customs. for your 7500 Wh requirements 280Ah cells would be ok I...