Hi everyone, I’m currently making a project for a leisure battery instalation in my car (LR4 if it matters). I would like to install a LifePo battery and connect it both to solar (using a MPPT controller) and to the car alternator (with a DC-DC charger). [2025-02-22 11.39.19] Is the scheme atta…

Thanks for the feedback, especially on the dual pole breaker, since one of the solar panels may be occasionally dismounted. My solar panel is 26V, 5.26A and 110W. I guess the other one will be something like it.

Hi Garry Actually, I just took a scheme from Google Images, and removed the irrelevant parts :slight_smile: So in case you find the software used to draw such schemes - I’m interested too.

Thanks everybody for the info about BMS. I’ve got 2 subsequent questions: In case I decide to stick with the Victron battery, would the Smart BMS CL 12/100 be OK for my setup? Do I need the DC-DC in that case? There is a scheme on the Victron website (attached below), which is similar to my pl…

Two 110 watt panels will not produce any more than about 18 amps (on the output side of the solar charge controller). So the 100/20 solar charge controller is the right size. Mismatched panels are not ideal. The general rule of thumb is that your production will be at the lowest common denominato…

@inquisistent Also to @HRTKD With the BMS you have chosen you may or may not need a DC to DC charger. If you have a simple alternator that outputs 14.4 to 14.5V all the time then you do not need a DC to DC. The BMS limits the charge current to a maximum value set by the fuse and output voltage to t…

We don’t see many of the Victron Smart BMS over at DIYSolarForum.com , so I’m not familiar with it. From the 50,000’ level, it functions like any other BMS. But as I get into the details there appear to be some interesting differences. Can the Smart BMS actually throttle the charge current? Mains…

@inquisistent @veitchy Luka is using draw.io 42' sailboat LFP upgrade - #3 by Lure

I’ve bought two portable (with wheels) 40L 12-24V 55W Chineese compressor refrigerators, not quite energy efficient class. It has dual compartment, can easily go down to -18C (0F) in either of them. I have used the one in passenger car, powered from its 12V 50Ah batt. Over a hot mediterranean night…

This device is more than a BMS. It has the standard BMS functions such as isolating charge and / or discharge on high / low voltage and temperature. It also has an additional circuit that monitors and limits the alternator current, so if you have an 80A alternator, you fit a 50A fuse and it limits t…

My vehicle is a 2016 Land Rover, its alternator is managed by its own BMS. The alternator outputs 14.4-14.5V only after starting the engine to charge the starter battery. After that, the voltage drops. In that case, as far as I understand, the scheme with the Victron BMS isn’t OK for me, and I shou…

Newbie advice needed (Car camping setup, DC-DC, MPPT)

DIY

inquisistent 1 March 2025 17:35 25

Finally, upon considering everything discussed in this topic, I would like to ask the community to verify the scheme below:

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Newbie advice needed (Car camping setup, DC-DC, MPPT)

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