UPS with Pylon - Limiting the SOC to 80%

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Pedro Lima asked Mar 2, '20

UPS with Pylon - Limiting the SOC to 80%

Hi there,

A customer brought a MPII 3000 + Pylon 48v from us, to do a small UPS system, but he wants to limit the upper SOC limit to 80%, to extend the battery lifetime.

Tried lowering the charge voltage, but no luck, keeps charging till it reaches 100%. Tried with ESS, using the "Scheduled charging", limited to 80%, but then, it discharges to 75%, then charges to 80%, then discharges to 75% (....), cycling the batteries.

I dont want to run the system without the CAN cable, any other solution?

Thanks

ups

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Answer 1 · 2020-03-07T22:34:05Z

Daniël Boekel (Victron Energy Staff) answered · Mar 07, 2020 at 10:34 PM

Hi @pedrolima

The battery manufacturer is the one to ask this question.

But in general: LiFePO4 batteries are very different from other Li-Ion chemistries, and most LiFePO4 batteries don't suffer from '100%' charge as other chemistries do, due to the lower cell voltages of LiFePO4 cells (generally, 3,45V per cell is fully charged)

so your customer -probably- doesn't need to worry about this, but please ask the battery supplier, as they know best about their batteries.

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