question

René Noordermeer avatar image
René Noordermeer asked

MP-2 48v 5kVA & SEPLOS BMS: ESS charging voltage high alarms

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There is a large difference between Batt-voltage and the Victron charge output voltage with intermittent charges, the voltages spikes above 60vdc.

How to solve this?

With a scope measuring, the spikes raised up to 62vdc with 100Hz pulses

Multiplus-IIBMSmultiplus ve.bus
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2 Answers
Alexandra avatar image
Alexandra answered ·

@René Noordermeer

The most often cause is the battery refusing charge or disconnecting. Or a poor connection between them.

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René Noordermeer avatar image
René Noordermeer answered ·

Hi Alexandra, sorry for late reply!

The SEPLOS BMS on CAN has its settings according https://www.victronenergy.com/media/pg/Cerbo_GX/en/dvcc---distributed-voltage-and-current-control.html

A long-time log with my TiePie scope connected on Victron DC output and the DC SEPLOS BMS and all components fitted inbetween, showed a severe voltage-drop over a 200A overload protection. After disconnecting, the faulty module, the high spikes on the ripple voltage were solved.

Thanks for thinking with me !


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