question

ahmedalsersy avatar image
ahmedalsersy asked

In ESS system, Which battery capacity should be used Absolute or useable?

I Am using ESS in an off grid system with hybrid batteries.

I only discharge till 50% Soc with Victron Quattro

My question is, while configuring the ESS, should I define the Absolute or the Useable Capacity?


Thank you

ESSoffgridbattery capacity
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4 Answers
wkirby avatar image
wkirby answered ·

Use absolute and then work down to 50% (or whatever) of the absolute.
If you use usable then if your "SOC" reads zero, you'll have no idea if you have gone below zero or not. If it did go below zero, you won't know how far below zero you have gone.

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ahmedalsersy avatar image ahmedalsersy commented ·

Thank you.

So The SOC is not treated here as a limit?

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boekel avatar image boekel ♦ ahmedalsersy commented ·

what do you mean by 'here'?

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ahmedalsersy avatar image ahmedalsersy boekel ♦ commented ·

I meant it is only used for dispaly.

I am asking becuase withh ESS, the Low battery led flashes when I start a load regalrdless of the SOC

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ahmedalsersy avatar image
ahmedalsersy answered ·

@Johannes Boonstra (Victron Energy Staff) @Guy Stewart (Victron Energy Staff).

It would be great to get your insight on this. Thank you

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ahmedalsersy avatar image
ahmedalsersy answered ·
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Mohamed Mamdouh Elkadragy avatar image Mohamed Mamdouh Elkadragy commented ·

Thanks for the clarification

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Johannes Boonstra (Victron Energy Staff) avatar image
Johannes Boonstra (Victron Energy Staff) answered ·

Yes, Using the absolute would be my advise, just as WKirby explained.

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ahmedalsersy avatar image ahmedalsersy commented ·

Thank you.

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