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fungi avatar image
fungi asked

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 avatar image boekel ♦ commented ·

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

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fungi avatar image fungi boekel ♦ commented ·

What information do you want

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boekel avatar image boekel ♦ fungi commented ·

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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4 Answers
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boekel answered ·

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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fungi avatar image
fungi answered ·

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


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img-20190219-094510243-hdr.jpg (3.4 MiB)
img-20190219-095053564-hdr.jpg (1.5 MiB)
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fungi answered ·

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 avatar image boekel ♦ commented ·

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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fungi answered ·

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 avatar image boekel ♦ commented ·

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

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