Bulk absorb bulk absorb bulk absorb bulk absorb

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kiwisolar
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Bulk absorb bulk absorb bulk absorb bulk absorb

Post by kiwisolar »

Hi all,
nothing critical this time, but what could be the cause of my system flicking between bulk and absorb every 10 mins or so, since about midday?
Just on solar (no generator involvment today :D ). Does this behaviour even matter?
Thanks!
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raysun
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Re: Bulk absorb bulk absorb bulk absorb bulk absorb

Post by raysun »

It usually means there is sufficient PV harvest to reach Absorb voltage, but not enough to sustain it consistently. It can be caused by passing clouds obscuring the sun temporarily, or large loads drawing power during the Absorb phase. When the charger can't maintain the constant voltage during Absorb, it drops back to constant current - Bulk - charging.
The only harm in it is if the charge cycle doesn't complete a full Absorb phase, the battery may end up not fully charged.
pss
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Re: Bulk absorb bulk absorb bulk absorb bulk absorb

Post by pss »

Raysun is correct. In my area where there are no clouds in the day, if the load increases enough (HVAC cycles on) to drop the voltage, the bulk is re-established. If load stays low enough during float time, it stays in float. I don't know much about clouds.
raysun
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REC Alpha 440W panels - 2 arrays: each of 4 strings of 2 in series
2 Midnite Solar MNPV6 combiners w/20A DC disconnects.
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Re: Bulk absorb bulk absorb bulk absorb bulk absorb

Post by raysun »

I don't know much about clouds.
I gotta say, here in the tropics, some cloud cover is a godsend. Without it, we would look like burned match heads.
pss
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Re: Bulk absorb bulk absorb bulk absorb bulk absorb

Post by pss »

In SoCal I have learned to perform all of my major outdoor projects from October through May. then from June through September its 8 AM to 11 AM outside maintenance and then 5 PM till 7 PM too. The rest of the day I do the indoor maintenance issues. And I buy the large quantities of concentrated gatorade liquid or power and we drink up. All of our outdoor critters have misting systems and provided shay areas to keep cool so they don't cook.
raysun
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My RE system: Flexpower Two: (2) FXR3048A-01 - Parallel Stacked, (2) FM80, MATE3s, FlexNetDC
6 SimpliPhi 3.8-48 (48v @ 75AH. 450AH total)
Outback IBR3 battery enclosure
REC Alpha 440W panels - 2 arrays: each of 4 strings of 2 in series
2 Midnite Solar MNPV6 combiners w/20A DC disconnects.
Honda EU7000is gas fuel generator
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Re: Bulk absorb bulk absorb bulk absorb bulk absorb

Post by raysun »

pss wrote: Mon Aug 01, 2022 9:19 am In SoCal I have learned to perform all of my major outdoor projects from October through May. then from June through September its 8 AM to 11 AM outside maintenance and then 5 PM till 7 PM too. The rest of the day I do the indoor maintenance issues. And I buy the large quantities of concentrated gatorade liquid or power and we drink up. All of our outdoor critters have misting systems and provided shay areas to keep cool so they don't cook.
Wise choices.
pss
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Re: Bulk absorb bulk absorb bulk absorb bulk absorb

Post by pss »

Getting ready to purchase the AED when I drop from the heat and exertion.
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kiwisolar
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My RE system: VFXR3048E
FM80-150VDC
Flexnet DC
Hoppecke Sun Power VR-M 6V 250AH batteries (16 total, 48V).
Gentech EP8000HSRE-RS Generator with Honda 390GX engine.

Re: Bulk absorb bulk absorb bulk absorb bulk absorb

Post by kiwisolar »

raysun wrote: Sun Jul 31, 2022 7:40 pm It usually means there is sufficient PV harvest to reach Absorb voltage, but not enough to sustain it consistently.
Thanks, makes sense, there is usually plenty of passing cloud cover which would cause the effect you describe. There's definitly days where it doesn't get the full absorb, but that's winter in New Zealand for you.
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Re: Bulk absorb bulk absorb bulk absorb bulk absorb

Post by Mike Curran »

I don't know much about clouds.
I've looked at clouds from both sides now
From up and down and still somehow
It's cloud illusions I recall
I really don't know clouds at all

You (pss) and Joni Mitchell both
https://ei.tigoenergy.com/p/pZXn7SZQyO45
https://enlighten.enphaseenergy.com/public/systems/Hctc107221
raysun
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Joined: Tue Jul 26, 2016 5:57 am
My RE system: Flexpower Two: (2) FXR3048A-01 - Parallel Stacked, (2) FM80, MATE3s, FlexNetDC
6 SimpliPhi 3.8-48 (48v @ 75AH. 450AH total)
Outback IBR3 battery enclosure
REC Alpha 440W panels - 2 arrays: each of 4 strings of 2 in series
2 Midnite Solar MNPV6 combiners w/20A DC disconnects.
Honda EU7000is gas fuel generator
Off-Grid

Re: Bulk absorb bulk absorb bulk absorb bulk absorb

Post by raysun »

Mike Curran wrote: Mon Aug 01, 2022 2:47 pm
I don't know much about clouds.
I've looked at clouds from both sides now
From up and down and still somehow
It's cloud illusions I recall
I really don't know clouds at all

You (pss) and Joni Mitchell both
😆
My favorite musician of all time. After suffering a nearly fatal brain aneurysm, she retired from the public eye for a decade. Then she wowed the crowd with an unannounced set at last week's Monterey Jazz Festival, accompanied by Brandi Carlile. Uncertain at first in her voice, when Joni sang the opening bars of "Both Sides Now" the electricity that ran through the performers and crowd was palpable. Brandi joined Joni on the chorus, then became overwhelmed with emotion. The whole band played at the altar of their goddess.
What a special moment in the annals of music that gave voice to a generation.
https://youtu.be/4aqGjaFDTxQ
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