Lifepo4 charging set up question

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matwill asked Dec 29, '20

Lifepo4 charging set up question

Hi,

I have a lifepo4 battery with a RECBMS, i also have solar panels connected to a victron MPPT and a 35amp alternator, my shore power comes from a Centaur charger. I also have a start battery connected to the alternator and the centaur charger. I was thinking of using a DC to DC charger (the orion) between the start and the lifepo4. I wanted to connect the MPPT directly to the lifepo4. What should I get to ensure that if the lifepo4 is overcharged or under temp (0-5 deg Celsius) that is stops charging from both the dc to dc charger and the MPPT. Should I use switching relays/monitors from Victron? Which ones?

MPPT SmartSolar Lithium Battery charger orion-tr smart

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Justin Cook ♦♦ commented · Dec 30, 2020 at 10:34 PM

Moving this question to the "Modifications" Space for non-supported systems so you'll have a better chance of the question being seen by other users who may have experience with your particular non-supported BMS.

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Modifications Space

Node Red Space

Answer 1 · 2024-06-04T19:19:46Z

loadinglevelone answered · Jun 04 at 07:19 PM

I use a Victron Smart Battery Sense set up in a VE network to stop charging when temperature is too low.

https://www.victronenergy.com/meters-and-sensors/smart-battery-sense

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Answer 2 · 2024-06-04T23:04:17Z

Mike Dorsett answered · Jun 04 at 11:04 PM

Ideally, The BMS should be able to control the charge rate from any source. This is normally done by linking the BMS to a GX device, which will then control the MPPT and the inverter according to the BMS requirements. However, the DC/DC charger can't be controlled in this manner, so the recourse is to use the overcharge protection relay output from the BMS to control the remote of the Dc/Dc charger.The BMS will also sense the temperature, and communicate this to the GX.

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