Low battery cutoff

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Smclark59
Forum Member
Posts: 8
Joined: Tue Jan 24, 2017 8:16 am
My RE system: FlexPower 1 3.5kw, 2-300w solar world panels. generator backup

Low battery cutoff

Post by Smclark59 » Tue Jan 24, 2017 12:08 pm

Just installed 3.5 kw Flexpower 1 for my first system. What is a safe low voltage battery cutoff for 24v battery bank with 370ah. Thank you.

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Sandra Herrera
OutBack Management
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Joined: Wed Jul 08, 2015 8:54 am
Location: Arlington, Washington

Re: Low battery cutoff

Post by Sandra Herrera » Tue Jan 24, 2017 12:29 pm

Hello,
It will depend on the type of batteries, and how deeply you want to discharge.
Remember, for most lead acid batteries the number of cycles (usable life of battery) is directly connected to discharging
Sandra Herrera
Applications Engineering


OutBack Power Technologies

Smclark59
Forum Member
Posts: 8
Joined: Tue Jan 24, 2017 8:16 am
My RE system: FlexPower 1 3.5kw, 2-300w solar world panels. generator backup

Re: Low battery cutoff

Post by Smclark59 » Tue Jan 24, 2017 12:38 pm

I have 4-Trojan L16e-ac 6v batteries for a 24v bank with 370ah. I am off grid with generator backup and wanting to know a safe level to discharge them. Right now it is set to 21v default. I have 4 more batteries in route to increase my storage capability.

blackswan555
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Joined: Sat Aug 30, 2008 5:50 am
My RE system: Other peoples, VFX "E" versions, FLA`s, Generators.
Location: Ibiza Spain,

Re: Low battery cutoff

Post by blackswan555 » Wed Jan 25, 2017 4:37 am

Low battery cut/ LBC is not meant as a safe level to discharge them to, More of an emergency "STOP" if all else fails, Your gen should have started way before LBC on its AGS settings which will be a fair bit higher,
If you do not have auto start and it is the only way of knowing "you have to go start gen" I would go with around 23.8v depending on loads, please fill your profile in as fully as possible, but 21v as the low end is way too low if thats your idea,

Tim
My comments are based on my experience and research, They are not endorsed or checked by Outback.I am an independent British electrician living in Spain, So please take this into account when reading /acting on my post`s.

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