Can someone please help me to understand what is going on here? I'm using hub-1 to manage 900 Ah of SLAs. I can't use ESS because the firmware won't let me. Tends to happen mainly in the morning and evening.

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fungi asked Feb 18, '19

Can someone please help me to understand what is going on here? I'm using hub-1 to manage 900 Ah of SLAs. I can't use ESS because the firmware won't let me. Tends to happen mainly in the morning and evening.

low battery warning

img-20190218-070100244-hdr.jpg (1.7 MiB)

img-20190218-070049746-hdr.jpg (2.5 MiB)

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boekel ♦ commented · Feb 18, 2019 at 09:08 PM

You'll have to give some more information about your system to be able to help you.

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fungi boekel ♦ commented · Feb 18, 2019 at 10:07 PM

What information do you want

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boekel ♦ fungi commented · Feb 18, 2019 at 11:04 PM

Everything that can help, we can't guess what's in your system and what happens.

So the system components, a diagram if possible.
pictures of the wiring

settings of the inverter
VRM curves of voltage / current / etc.

a low voltage message at 28 volts seems strange ;)

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boekel answered · Feb 19, 2019 at 09:40 AM

I think I'd just use a 'generator start/stop' assistant to engage AC-in for such a system, but that shouldn't be the reason it doesnt work.

Can you measure at the battery terminals of the Multi what the actual voltage is there? My first suspicion would be a voltage drop somewhere.

You didn't post pictures of the cabling. checked all fuses in system?

did you set battery monitor in the CCGX to BMV?

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Modifications Space

Node Red Space

Answer 1 · 2019-02-19T02:22:17Z

fungi answered · Feb 19, 2019 at 02:22 AM

Here are some photos of the system. Charger not enabled, virtual switch not enabled. grid feeding not permitted.

img-20190219-094944331-hdr.jpg (2.0 MiB)

img-20190219-094922038-hdr.jpg (2.2 MiB)

img-20190219-094712509-hdr.jpg (3.3 MiB)

img-20190219-094427517-hdr.jpg (3.7 MiB)

img-20190219-094510243-hdr.jpg (3.4 MiB)

img-20190219-095053564-hdr.jpg (1.5 MiB)

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Answer 2 · 2019-02-19T15:11:07Z

fungi answered · Feb 19, 2019 at 03:11 PM

I've identified the problem. The batteries are cactus. I'm considering investing in NiFe to replace them. Not much info on them in this forum.... ..

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boekel ♦ commented · Feb 19, 2019 at 03:21 PM

Thanks for the update.

Out of curiosity I looked up your batteries, they're designed for 'floating' applications, like UPS systems / telecom power supplies.
Using these for cyclic applications you're lucky if you get 200 cycles out of them.

https://www.cyb.co.nz/content/industrial/telecommunications/batteries/uxl-specs/uxl220-2.pdf

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Answer 3 · 2019-02-21T08:58:51Z

fungi answered · Feb 21, 2019 at 08:58 AM

I got them five years ago for five hundred dollars and they have done a reasonable job in that time. They were discharged to 22.5 v every day.

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boekel ♦ commented · Feb 21, 2019 at 11:40 AM

Good catch then :)
And one of the upsides of lead-acid...scrap value is usually also good ;)

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