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APC UPS float voltage limit
#1
Folks new to the Forum so be gentle with me  [Image: biggrin.png]

I have three APC UPS inverters 2 3000kva and 1 5000kva which I was planning to use to charge my 14s100p battery packs.

My problem [Image: sad.png]is adjustment of the float voltage on the unit I am trying to adjust I can only get to 54.5volts I believe I would need to adjust to 57.4 volts anyone advise me what I might be doing wrong?

I can get to the cli no issue and the SM PROG are all taking, what I noticed with ACPFIX program the dashboard is showing my 3000 smart inverter as a smart ups 500 could this be my problem? hopefully someone can point me in the right direction.

Thanks in advance 

Paul
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#2
Perhaps screen shots of your settings and a run down of what you are actually doing. Otherwise, we can't tell you what you might be doing wrong, if anything.

You may need to get the server grade PowerChute software.
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#3
(11-28-2019, 01:56 PM)Korishan Wrote: Perhaps screen shots of your settings and a run down of what you are actually doing. Otherwise, we can't tell you what you might be doing wrong, if anything.

You may need to get the server grade PowerChute software.
Thanks for your reply, like I say new to this Forum stuff, and heave read many many articles, I will structure a better request with more relevant information.

but thanks again in replying so quickly.

Cheers

Paul
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#4
Ok At home now been at work all day,

This year I had fully installed Solar Panels mad up of 14 320W panels. I have been on a green crusade since I had the panels installed and started to enquire about a commercial offering power-wall. I've also been investigating the possibility of building my own using recycled 18650's, Youtube has inspired me especially the antics of Pete and Average Joe.

My idea was to a 14s100p setup and I have harvested 1400 the batteries and acquired two working secondhand APC UPS units SU3000 and I have just acquired a SU5000 unit. I intend to use one of these units to charge my batteries and also power a number of items in the house.
I was in the process of trying to adjust the float voltage on one of these units but I seem to have managed to inadvertently screwed a setting up in the Smart constants settings which I had to manually reset and recover the unit.

The unit is only connected to Pb 48v batteries at the moment as I'm trying to adjust the float to 56 volts which is 14 x 4.0 for the 18650's I intend to charge, I believe I have this correct, so correct me if I'm wrong.
The APC appears to only allow me to change the float voltage to 54.5 so I'm wondering if these units are viable to achieve my objective of charging 18650's. I see a number of folk on youTube have used them so I believe they should work or am I missing something.

Excuse the ramblings hopefully some of this will make sense.
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#5
(11-28-2019, 11:20 PM)Earlonics Wrote: The APC appears to only allow me to change the float voltage to 54.5 so I'm wondering if these units are viable to achieve my objective of charging 18650's. I see a number of folk on youTube have used them so I believe they should work or am I missing something.
54.5v (3.89v/cell) on yours,  55.5 (3.96v/cell) on my APCs - e.g. close to 4.0v.  4.0v is a good max for extended life.   This is 10-13% less that if charge up to 4.1v.    I have moved on to charge controller / large inverter but I still top out at 4.0v for long life and made my battery 15% larger - so its not wrong but rather what works for you.     I say this to encourage you Smile
 
I read that certain advanced server APCs are settable but mine of not of that variety so I can't help from experience with this.
Earlonics likes this post
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#6
(11-29-2019, 01:52 AM)OffGridInTheCity Wrote:
(11-28-2019, 11:20 PM)Earlonics Wrote: The APC appears to only allow me to change the float voltage to 54.5 so I'm wondering if these units are viable to achieve my objective of charging 18650's. I see a number of folk on youTube have used them so I believe they should work or am I missing something.
54.5v (3.89v/cell) on yours,  55.5 (3.96v/cell) on my APCs - e.g. close to 4.0v.  4.0v is a good max for extended life.   This is 10-13% less that if charge up to 4.1v.    I have moved on to charge controller / large inverter but I still top out at 4.0v for long life and made my battery 15% larger - so its not wrong but rather what works for you.     I say this to encourage you Smile
 
I read that certain advanced server APCs are settable but mine of not of that variety so I can't help from experience with this.
Thanks for your reply Wink and your encouragement, since I have owned these APC UPS I have learnt a lot and its workings.

I can tweak these devices just so far, like everyone going through this journey any advice and knowledge shared is so helpful. I will be posting my findings on the APC UPS's .

I want to ultimately stop wasting the power my solar makes by sending surplus to the grid and maximise my usage through the use of batteries. I've been  disappointed  by the utility companies charging you 3 times more than what they pay you, for what you put back into the grid. Can I ask, what is the Charge Controller/Large inverter that you use?
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#7
Ahh now we're getting somewhere.... you have a grid tie system but don't want to waste selling back to the grid. Next time start with that. So what you need is an AC coupled system that will work together with your grid tie inverter. A UPS is just terrible because it's not meant to be one. Until someone figures it out, avoid UPS other than to use it as it was intended. As for AC coupled systems, you might want to start with the brand of your grid-tie inverter. For example, if you already have a sunnyboy inverter, then a sunny island may suit you better since it will work well together . A 6000kw sunny island can be had for around $1500 now. You want to load shift so you charge during the day when the inverter is on. You also might want to look at your electric rates, so if you have multi-tiered rates it might benefit to go on battery during peak and charging during off-peak.
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#8
(11-29-2019, 09:09 PM)Earlonics Wrote:
(11-29-2019, 01:52 AM)OffGridInTheCity Wrote:
(11-28-2019, 11:20 PM)Earlonics Wrote: The APC appears to only allow me to change the float voltage to 54.5 so I'm wondering if these units are viable to achieve my objective of charging 18650's. I see a number of folk on youTube have used them so I believe they should work or am I missing something.
54.5v (3.89v/cell) on yours,  55.5 (3.96v/cell) on my APCs - e.g. close to 4.0v.  4.0v is a good max for extended life.   This is 10-13% less that if charge up to 4.1v.    I have moved on to charge controller / large inverter but I still top out at 4.0v for long life and made my battery 15% larger - so its not wrong but rather what works for you.     I say this to encourage you Smile
 
I read that certain advanced server APCs are settable but mine of not of that variety so I can't help from experience with this.
Thanks for your reply Wink and your encouragement, since I have owned these APC UPS I have learnt a lot and its workings.

I can tweak these devices just so far, like everyone going through this journey any advice and knowledge shared is so helpful. I will be posting my findings on the APC UPS's .

I want to ultimately stop wasting the power my solar makes by sending surplus to the grid and maximise my usage through the use of batteries. I've been  disappointed  by the utility companies charging you 3 times more than what they pay you, for what you put back into the grid. Can I ask, what is the Charge Controller/Large inverter that you use?
My system is off-grid and I use Midnite Classic 150s as my charge controllers, 14s 18650 DIY battery bank, and an AIMS 12,000w inverter. I use the APCs to smooth the twice daily ATS switch over to inverter power and back to grid.
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#9
(11-29-2019, 11:13 PM)OffGridInTheCity Wrote:
(11-29-2019, 09:09 PM)Earlonics Wrote:
(11-29-2019, 01:52 AM)OffGridInTheCity Wrote:
(11-28-2019, 11:20 PM)Earlonics Wrote: The APC appears to only allow me to change the float voltage to 54.5 so I'm wondering if these units are viable to achieve my objective of charging 18650's. I see a number of folk on youTube have used them so I believe they should work or am I missing something.
54.5v (3.89v/cell) on yours,  55.5 (3.96v/cell) on my APCs - e.g. close to 4.0v.  4.0v is a good max for extended life.   This is 10-13% less that if charge up to 4.1v.    I have moved on to charge controller / large inverter but I still top out at 4.0v for long life and made my battery 15% larger - so its not wrong but rather what works for you.     I say this to encourage you Smile
 
I read that certain advanced server APCs are settable but mine of not of that variety so I can't help from experience with this.
Thanks for your reply Wink and your encouragement, since I have owned these APC UPS I have learnt a lot and its workings.

I can tweak these devices just so far, like everyone going through this journey any advice and knowledge shared is so helpful. I will be posting my findings on the APC UPS's .

I want to ultimately stop wasting the power my solar makes by sending surplus to the grid and maximise my usage through the use of batteries. I've been  disappointed  by the utility companies charging you 3 times more than what they pay you, for what you put back into the grid. Can I ask, what is the Charge Controller/Large inverter that you use?
My system is off-grid and I use Midnite Classic 150s as my charge controllers, 14s 18650 DIY battery bank, and an AIMS 12,000w inverter.    I use the APCs to smooth the twice daily ATS switch over to inverter power and back to grid.

Thanks for the update everyone and the useful information, I'll go and ponder my next actions, but it seems i might have made the wrong choice of using these APC ups units, although in the back of my head I'm sure they can be utilised 
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