Determining the correct settings for my system?

Discussion about the MX60 Charge Controller

Moderators: OutBack Moderator Team, OutBack

jtzako
Forum Whiz
Posts: 40
Joined: Sun Dec 27, 2020 12:45 pm
My RE system: OBPS Auto transformer PSX-240
2x Inverter VFX 3648
2x OBPS PS2DC Industrial Control Panel 3004905
OBPS MX - 60 MPPT Charge Controller
Kohler Generator 14RESA
1x OBPS Mate
15x Sharp ND-208U2 Solar Panels
16x Deka Pro Master 8L16T875 batteries

Determining the correct settings for my system?

Post by jtzako »

I bought a house with a solar/battery off-grid system and I believe some of the settings in my system may be incorrect. The batteries do not last anywhere near as long as they should after reaching 'full charge' (according to the CC at least). I suspect that the system is not actually fully charging.

I did voltage tests on all 16 batteries while they where charging and the voltages were 6.27-6.42 which I believe is correct for these Deka Pro Master 8L16T875 batteries. Today I checked specific gravity right after the generator finished its charge cycle (including the 1hr absorb to 57.6v) and the batteries where in the 70-80 degree Fahrenheit range on the top of them. (not sure if that is the right place to measure?) All of them where down in the red on the hydrometer. (its an old one that was left at the house, I'm ordering a Hydro Volt one to test again in case that one is no good). The water level appears to be correct on all cells as well.

The batteries are in 2 banks of 48v.

Here are some of the settings I could find. If there are other settings I need to check let me know.
The Mate (original version) settings:
Absorb 57.6 1hour
Float 53.2 1hour
Refloat 50
EQ 62 1hr (EQ is not set to run on its own)
Charger Limit 20.00 acc

AGS settings:
Gen stop 76v
Volt start:
24hr 48.8
2hr 47.2
2min 46.0

MX-60 Charge Controller settings:
Limit 70 amps
Absorb 57.8 4hrs
float 53.4
raysun
Forum Emperor
Posts: 4540
Joined: Tue Jul 26, 2016 5:57 am
My RE system: Flexpower Two: (2) FXR3048A, (2) FM80, MATE3s, FlexNetDC
SimpliPhi 48-3.8 (6 @ 48v)
Outback IBR3 battery enclosure
REC Alpha 440W panels - 2 arrays: each of 4 strings of 2 in series
Honda EU7000is gas fuel generator

Re: Determining the correct settings for my system?

Post by raysun »

Do you know how old the battery is?
sbrownian
Forum Czar
Posts: 538
Joined: Mon Nov 30, 2020 9:23 am
My RE system: GS8048 FM80 FNDC Mate3
4kw solar
7kw Kubota propane gen
Had 1200 Ahr FLA Locomotive batts
Just replaced with
2 x 300 Ah ReLion Lithium packs
MUCH more efficient!!
Location: Central Washington State

Re: Determining the correct settings for my system?

Post by sbrownian »

Your charging voltage is low, and your batteries are very under charged.

(As the 'red' SG readings are also indicative of.)

The cut sheet lists 2.45 vpc absorption charge voltage in cycle applications. That works out to 7.35 v per monoblock, 58.8 for a '48v' battery bank.

Do you have a temperature sensor to automatically adjust the voltage based on temperature of the blocks?


https://www.sunwize.com/wp-content/uplo ... 6-DEKA.pdf
Information, you get not; if incorrect question, you ask..
jtzako
Forum Whiz
Posts: 40
Joined: Sun Dec 27, 2020 12:45 pm
My RE system: OBPS Auto transformer PSX-240
2x Inverter VFX 3648
2x OBPS PS2DC Industrial Control Panel 3004905
OBPS MX - 60 MPPT Charge Controller
Kohler Generator 14RESA
1x OBPS Mate
15x Sharp ND-208U2 Solar Panels
16x Deka Pro Master 8L16T875 batteries

Re: Determining the correct settings for my system?

Post by jtzako »

raysun wrote: Sat Jan 09, 2021 10:34 pm Do you know how old the battery is?
All 16 are from 8/2019.
jtzako
Forum Whiz
Posts: 40
Joined: Sun Dec 27, 2020 12:45 pm
My RE system: OBPS Auto transformer PSX-240
2x Inverter VFX 3648
2x OBPS PS2DC Industrial Control Panel 3004905
OBPS MX - 60 MPPT Charge Controller
Kohler Generator 14RESA
1x OBPS Mate
15x Sharp ND-208U2 Solar Panels
16x Deka Pro Master 8L16T875 batteries

Re: Determining the correct settings for my system?

Post by jtzako »

sbrownian wrote: Sat Jan 09, 2021 10:41 pm Your charging voltage is low, and your batteries are very under charged.

(As the 'red' SG readings are also indicative of.)

The cut sheet lists 2.45 vpc absorption charge voltage in cycle applications. That works out to 7.35 v per monoblock, 58.8 for a '48v' battery bank.

Do you have a temperature sensor to automatically adjust the voltage based on temperature of the blocks?


https://www.sunwize.com/wp-content/uplo ... 6-DEKA.pdf
Would that mean I need to increase the Absorb voltage? How about the abosrb time?
As far as I can tell there isnt a temperature sensor on this system.
raysun
Forum Emperor
Posts: 4540
Joined: Tue Jul 26, 2016 5:57 am
My RE system: Flexpower Two: (2) FXR3048A, (2) FM80, MATE3s, FlexNetDC
SimpliPhi 48-3.8 (6 @ 48v)
Outback IBR3 battery enclosure
REC Alpha 440W panels - 2 arrays: each of 4 strings of 2 in series
Honda EU7000is gas fuel generator

Re: Determining the correct settings for my system?

Post by raysun »

jtzako wrote: Sun Jan 10, 2021 8:11 am
raysun wrote: Sat Jan 09, 2021 10:34 pm Do you know how old the battery is?
All 16 are from 8/2019.
In that time, has the battery been on the same charging profile as now?

If so, the chronic undercharging likely caused significant sulfate buildup. The sulfuric acid electrolyte will have been weakened and the lead plates covered with an impervious layer of lead sulfate. Both these likely have caused significant reduction in charge storage capacity. In this condition, the battery will charge quickly and discharge quickly.

Using a quality hydrometer to measure specific gravity will give a more accurate picture, but even the auto parts store cheapie raises a red flag, literally. Unless the glass tube is broken, the float mechanism indicating red immediately after charging is a troubling indicator.

The proper charging settings can, and should, be programmed into the charge controller and the inverter's chargers. However, even with proper charging now, the probability of reversing the battery wear is likely to be low.

I hope I'm wrong on this, and the charging parameter situation is a recent issue, in which case, there may be some improvement with proper charging.

Attempt a full charge, at the proper Absorb voltage for sufficient time. Prior replies list a proper voltage. I'm not sure about the Absorb time, especially at this point, but certainly 1 hour is not enough. I'd try 2 hours to start. After which check specific gravity. With a high surface charge, the cells should read "Good", though that state isn't likely to last as the surface charge "bleeds off".

If, after the charge cycle at 2 hour Absorb, the specific gravity measures "Fair " or "Poor", force another charge cycle. Likely you will need to do it with the inverter chargers by running the generator.

After a 2nd cycle completes, its likely the battery will have accepted every drop of charge that its going to. Check specific gravity again, bearing in mind surface charge is likely to paint a temporary "rosy picture".

Running the inverters after the charge cycle where the specific gravity indicates "Good" will tell the tale. If a marked improvement in runtime is seen, then there may be hope for the future. If only a marginal improvement in runtime, with essentially 10 - 20 times the charge going into the battery than before, is going to strongly suggest the battery is kaput, and its time to explore a replacement.

I don't see a battery monitor listed in the profile. Is there one installed?
jtzako
Forum Whiz
Posts: 40
Joined: Sun Dec 27, 2020 12:45 pm
My RE system: OBPS Auto transformer PSX-240
2x Inverter VFX 3648
2x OBPS PS2DC Industrial Control Panel 3004905
OBPS MX - 60 MPPT Charge Controller
Kohler Generator 14RESA
1x OBPS Mate
15x Sharp ND-208U2 Solar Panels
16x Deka Pro Master 8L16T875 batteries

Re: Determining the correct settings for my system?

Post by jtzako »

raysun wrote: Sun Jan 10, 2021 9:06 am
jtzako wrote: Sun Jan 10, 2021 8:11 am
raysun wrote: Sat Jan 09, 2021 10:34 pm Do you know how old the battery is?
All 16 are from 8/2019.
In that time, has the battery been on the same charging profile as now?
As far as I know the settings are how they have been for a very long time (even before this current battery bank was installed). I just moved in about a month ago and am trying to get it sorted out so things are right for the future.

Should the absorb be 58.8v rather than 57.6? What about things like bulk etc?

Also, should the Mate and CC both have the same #s? (I notice that they do not for some things)
raysun
Forum Emperor
Posts: 4540
Joined: Tue Jul 26, 2016 5:57 am
My RE system: Flexpower Two: (2) FXR3048A, (2) FM80, MATE3s, FlexNetDC
SimpliPhi 48-3.8 (6 @ 48v)
Outback IBR3 battery enclosure
REC Alpha 440W panels - 2 arrays: each of 4 strings of 2 in series
Honda EU7000is gas fuel generator

Re: Determining the correct settings for my system?

Post by raysun »

jtzako wrote: Sun Jan 10, 2021 3:40 pm
raysun wrote: Sun Jan 10, 2021 9:06 am
jtzako wrote: Sun Jan 10, 2021 8:11 am

All 16 are from 8/2019.
In that time, has the battery been on the same charging profile as now?
As far as I know the settings are how they have been for a very long time (even before this current battery bank was installed). I just moved in about a month ago and am trying to get it sorted out so things are right for the future.

Should the absorb be 58.8v rather than 57.6? What about things like bulk etc?

Also, should the Mate and CC both have the same #s? (I notice that they do not for some things)
There are 3 battery chargers in the system -
The MX60 solar charge controller, and the two VFX3648 inverters.

The MX60 can be programmed via its front panel or via the Mate.
Absorb Voltage 58.8V
Absorb Time 2H
Float Voltage 56.4V

The VFX3648 inverters chargers are programmed via the Mate.
On each inverter:
Absorb Voltage 58.4V
Absorb Time 2H
Float Voltage 56V
Float Time 2H

Those values are for charging at 60°F. The Outback systems are capable of temperature compensated charging if the Remote Temperature Sensor is installed.

Note that the inverter chargers are set 0.4V lower than the MX60. This is to give the charge controller priority, should all chargers be in operation at the same time.

There is no Bulk setting as such. It is a constant current phase that executes until the battery reaches the Absorb Voltage.

Not sure what other values are being referred to as CC and Mate being different. List the values you're looking at.
jtzako
Forum Whiz
Posts: 40
Joined: Sun Dec 27, 2020 12:45 pm
My RE system: OBPS Auto transformer PSX-240
2x Inverter VFX 3648
2x OBPS PS2DC Industrial Control Panel 3004905
OBPS MX - 60 MPPT Charge Controller
Kohler Generator 14RESA
1x OBPS Mate
15x Sharp ND-208U2 Solar Panels
16x Deka Pro Master 8L16T875 batteries

Re: Determining the correct settings for my system?

Post by jtzako »

raysun wrote: Sun Jan 10, 2021 5:13 pm
Not sure what other values are being referred to as CC and Mate being different. List the values you're looking at.
On the CC itself under the charger I can see Amps (70.0) and Absorb (now 58.8) and Float (now 56.4). I dont see any way to adjust times on the CC.
On the Mate under FX I have it set to Absorb 58.8v for 2hrs and Float 56v for 2hrs on both ports.

On the Mate under CC everything is NA. I'm guessing that means the Mate is not talking to the CC?

On the Mate screens there are a lot of other settings, I'm not sure if some of those might need to be adjusted to be correct for this system.
raysun
Forum Emperor
Posts: 4540
Joined: Tue Jul 26, 2016 5:57 am
My RE system: Flexpower Two: (2) FXR3048A, (2) FM80, MATE3s, FlexNetDC
SimpliPhi 48-3.8 (6 @ 48v)
Outback IBR3 battery enclosure
REC Alpha 440W panels - 2 arrays: each of 4 strings of 2 in series
Honda EU7000is gas fuel generator

Re: Determining the correct settings for my system?

Post by raysun »

jtzako wrote: Sun Jan 10, 2021 5:46 pm
raysun wrote: Sun Jan 10, 2021 5:13 pm
Not sure what other values are being referred to as CC and Mate being different. List the values you're looking at.
On the CC itself under the charger I can see Amps (70.0) and Absorb (now 58.8) and Float (now 56.4). I dont see any way to adjust times on the CC.
On the Mate under FX I have it set to Absorb 58.8v for 2hrs and Float 56v for 2hrs on both ports.

On the Mate under CC everything is NA. I'm guessing that means the Mate is not talking to the CC?

On the Mate screens there are a lot of other settings, I'm not sure if some of those might need to be adjusted to be correct for this system.
The charge controller is the older MX version, and not the newer FM model, correct?

The solar charge controllers will switch to Float when Absorb completes, and stay in Float until the sun goes down. There is no Float Time for the charge controller.

The 70 Amp setting is the maximum current the controller will put out. The battery should be able to accept that amount without issue.

The suggested settings on the Inverter Chargers are 0.4V LOWER than those on the charge controller, as explained above. There's no harm having them set to the same target voltages, however if both Inverter Chargers and Charge Controller are running at the same time, the charge cobtroller is likely to go to sleep.

The inverter chargers have a Float Time, as they are driven by a generator (or other AC source) and the timer helps to limit AC consumption.

I don't know about the older MX / Mate communication. Is there an Outback Hub that the devices are connected to?
jtzako
Forum Whiz
Posts: 40
Joined: Sun Dec 27, 2020 12:45 pm
My RE system: OBPS Auto transformer PSX-240
2x Inverter VFX 3648
2x OBPS PS2DC Industrial Control Panel 3004905
OBPS MX - 60 MPPT Charge Controller
Kohler Generator 14RESA
1x OBPS Mate
15x Sharp ND-208U2 Solar Panels
16x Deka Pro Master 8L16T875 batteries

Re: Determining the correct settings for my system?

Post by jtzako »

raysun wrote: Sun Jan 10, 2021 6:05 pm
The charge controller is the older MX version, and not the newer FM model, correct?

I don't know about the older MX / Mate communication. Is there an Outback Hub that the devices are connected to?
The CC is MX-60 MPPT (verified on its sticker)
The CC, Mate and two Inverters are connected to the side of a Hub.

Here is what it looks like:

https://imgur.com/a/8ksK6Uu

Here are some pics of the system: https://imgur.com/a/r1CB96g
raysun
Forum Emperor
Posts: 4540
Joined: Tue Jul 26, 2016 5:57 am
My RE system: Flexpower Two: (2) FXR3048A, (2) FM80, MATE3s, FlexNetDC
SimpliPhi 48-3.8 (6 @ 48v)
Outback IBR3 battery enclosure
REC Alpha 440W panels - 2 arrays: each of 4 strings of 2 in series
Honda EU7000is gas fuel generator

Re: Determining the correct settings for my system?

Post by raysun »

jtzako wrote: Sun Jan 10, 2021 6:17 pm
raysun wrote: Sun Jan 10, 2021 6:05 pm
The charge controller is the older MX version, and not the newer FM model, correct?

I don't know about the older MX / Mate communication. Is there an Outback Hub that the devices are connected to?
The CC is MX-60 MPPT (verified on its sticker)
The CC, Mate and two Inverters are connected to the side of a Hub.

Here is what it looks like:

https://imgur.com/a/8ksK6Uu

Here are some pics of the system: https://imgur.com/a/r1CB96g
Picture's worth a 1000 words.

Do you have the documents for each of the devices? MX60, VFX3648, Mate?
jsmith
Forum Member
Posts: 21
Joined: Thu Nov 21, 2002 11:01 pm
My RE system: 12 Shell SQ 165 and 175 (2kW)
MX60
2 FX3048T
X240 Autotransformer
Mate (original)
FNDC
Hub-4
Hawker PowerSafe AGM Battery, 1800 Ah
Northern Lights 8 kW Diesel Generator
Location: Big Island, HI

Re: Determining the correct settings for my system?

Post by jsmith »

The MX60 can't be controlled by the original Mate. But the Mate will show its status, read only. (Other Mate menus inop. for it. ) I could be wrong but I don't think the newer Mates can change MX60 settings either.
raysun
Forum Emperor
Posts: 4540
Joined: Tue Jul 26, 2016 5:57 am
My RE system: Flexpower Two: (2) FXR3048A, (2) FM80, MATE3s, FlexNetDC
SimpliPhi 48-3.8 (6 @ 48v)
Outback IBR3 battery enclosure
REC Alpha 440W panels - 2 arrays: each of 4 strings of 2 in series
Honda EU7000is gas fuel generator

Re: Determining the correct settings for my system?

Post by raysun »

jsmith wrote: Sun Jan 10, 2021 9:12 pm The MX60 can't be controlled by the original Mate. But the Mate will show its status, read only. (Other Mate menus inop. for it. ) I could be wrong but I don't think the newer Mates can change MX60 settings either.
I believe you are correct.
jtzako
Forum Whiz
Posts: 40
Joined: Sun Dec 27, 2020 12:45 pm
My RE system: OBPS Auto transformer PSX-240
2x Inverter VFX 3648
2x OBPS PS2DC Industrial Control Panel 3004905
OBPS MX - 60 MPPT Charge Controller
Kohler Generator 14RESA
1x OBPS Mate
15x Sharp ND-208U2 Solar Panels
16x Deka Pro Master 8L16T875 batteries

Re: Determining the correct settings for my system?

Post by jtzako »

raysun wrote: Sun Jan 10, 2021 6:28 pm
Picture's worth a 1000 words.

Do you have the documents for each of the devices? MX60, VFX3648, Mate?
I do. I also have a couple of laminated sheets the installer made for helping navigate the Mate menus.
raysun
Forum Emperor
Posts: 4540
Joined: Tue Jul 26, 2016 5:57 am
My RE system: Flexpower Two: (2) FXR3048A, (2) FM80, MATE3s, FlexNetDC
SimpliPhi 48-3.8 (6 @ 48v)
Outback IBR3 battery enclosure
REC Alpha 440W panels - 2 arrays: each of 4 strings of 2 in series
Honda EU7000is gas fuel generator

Re: Determining the correct settings for my system?

Post by raysun »

OK.

Try the higher Absorb settings and run a charge cycle.

Let us know how it goes.
jtzako
Forum Whiz
Posts: 40
Joined: Sun Dec 27, 2020 12:45 pm
My RE system: OBPS Auto transformer PSX-240
2x Inverter VFX 3648
2x OBPS PS2DC Industrial Control Panel 3004905
OBPS MX - 60 MPPT Charge Controller
Kohler Generator 14RESA
1x OBPS Mate
15x Sharp ND-208U2 Solar Panels
16x Deka Pro Master 8L16T875 batteries

Re: Determining the correct settings for my system?

Post by jtzako »

raysun wrote: Mon Jan 11, 2021 7:28 am OK.

Try the higher Absorb settings and run a charge cycle.

Let us know how it goes.
I've got the settings in place. Once the new hydrometer gets here I'll get some new readings and see how a few days of higher values works out.
jtzako
Forum Whiz
Posts: 40
Joined: Sun Dec 27, 2020 12:45 pm
My RE system: OBPS Auto transformer PSX-240
2x Inverter VFX 3648
2x OBPS PS2DC Industrial Control Panel 3004905
OBPS MX - 60 MPPT Charge Controller
Kohler Generator 14RESA
1x OBPS Mate
15x Sharp ND-208U2 Solar Panels
16x Deka Pro Master 8L16T875 batteries

Re: Determining the correct settings for my system?

Post by jtzako »

raysun wrote: Mon Jan 11, 2021 7:28 am OK.

Try the higher Absorb settings and run a charge cycle.

Let us know how it goes.
Ok, this morning the generator is running so it should attempt to reach full charge. The voltage #s on the mate/cc are barely moving (I watch for several minutes and the #s dont change in that time).

I noticed that the batteries arent getting hot (currently about 72F as read by a laser thermometer to the side or top of the casings). Are they actually charging if they are that cool?

Here is what the screens show currently:

Mate:
FX Totals 57.6
Charging 4.300kW
AC Loads 1.300kW

CC:
PV 073 Bat 57.1
04.9A 06.0A

Update: About 1.5 hrs later its only up to 58.4V. Also I see the generator has backed way off, it is only 'buying' 0.800kW now and solar is in the 1700 watt range.
Update 2: another 30 minutes or so later we are at 58.8v on the Mate (a bit less on the CC). The generator is 'buying' .600kW now but charging is on 0.000. Solar is a bit over 2200. I'm assuming the generator should be shutting off since solar is producing more than I'm using but it hasnt as of yet.
sbrownian
Forum Czar
Posts: 538
Joined: Mon Nov 30, 2020 9:23 am
My RE system: GS8048 FM80 FNDC Mate3
4kw solar
7kw Kubota propane gen
Had 1200 Ahr FLA Locomotive batts
Just replaced with
2 x 300 Ah ReLion Lithium packs
MUCH more efficient!!
Location: Central Washington State

Re: Determining the correct settings for my system?

Post by sbrownian »

Are voltage readings across the individual mono blocks pretty much even?
Information, you get not; if incorrect question, you ask..
raysun
Forum Emperor
Posts: 4540
Joined: Tue Jul 26, 2016 5:57 am
My RE system: Flexpower Two: (2) FXR3048A, (2) FM80, MATE3s, FlexNetDC
SimpliPhi 48-3.8 (6 @ 48v)
Outback IBR3 battery enclosure
REC Alpha 440W panels - 2 arrays: each of 4 strings of 2 in series
Honda EU7000is gas fuel generator

Re: Determining the correct settings for my system?

Post by raysun »

jtzako wrote: Tue Jan 12, 2021 6:50 am
raysun wrote: Mon Jan 11, 2021 7:28 am OK.

Try the higher Absorb settings and run a charge cycle.

Let us know how it goes.
Ok, this morning the generator is running so it should attempt to reach full charge. The voltage #s on the mate/cc are barely moving (I watch for several minutes and the #s dont change in that time).

I noticed that the batteries arent getting hot (currently about 72F as read by a laser thermometer to the side or top of the casings). Are they actually charging if they are that cool?

Here is what the screens show currently:

Mate:
FX Totals 57.6
Charging 4.300kW
AC Loads 1.300kW

CC:
PV 073 Bat 57.1
04.9A 06.0A

Update: About 1.5 hrs later its only up to 58.4V. Also I see the generator has backed way off, it is only 'buying' 0.800kW now and solar is in the 1700 watt range.
Update 2: another 30 minutes or so later we are at 58.8v on the Mate (a bit less on the CC). The generator is 'buying' .600kW now but charging is on 0.000. Solar is a bit over 2200. I'm assuming the generator should be shutting off since solar is producing more than I'm using but it hasnt as of yet.
Simultaneous charging by generator/inverter and solar charge controllers requires all units be calibrated to the battery voltage, as the chargers' behavior is driven by the battery voltage.

Without further data, the exact reason the battery loitered at 57.6 is speculation. However, it wouldn't be a surprising condition given the relatively low (50A+) charging current and the presumed battery condition.

An eventual increase in voltage can be taken as a hopeful sign. It may indicate some of the lead sulfate buildup is breaking down. Again speculation.

When the battery reaches 58.8, did the charge controllers indicate Absorb? Hopefully so.

The inverter charger may have gone idle at that point if its voltage readings indicated it had nothing to do. The generator would continue to provide current for house loads.
jtzako
Forum Whiz
Posts: 40
Joined: Sun Dec 27, 2020 12:45 pm
My RE system: OBPS Auto transformer PSX-240
2x Inverter VFX 3648
2x OBPS PS2DC Industrial Control Panel 3004905
OBPS MX - 60 MPPT Charge Controller
Kohler Generator 14RESA
1x OBPS Mate
15x Sharp ND-208U2 Solar Panels
16x Deka Pro Master 8L16T875 batteries

Re: Determining the correct settings for my system?

Post by jtzako »

raysun wrote: Tue Jan 12, 2021 9:30 am
When the battery reaches 58.8, did the charge controllers indicate Absorb? Hopefully so.

The inverter charger may have gone idle at that point if its voltage readings indicated it had nothing to do. The generator would continue to provide current for house loads.
I didnt see it say absorb when it got up to 58.8. When it was showing 58.8 on the Mate it was a bit less than that still on the CC. Unfortunately when the generator turned off about 20 minutes later I was in the middle of some work and couldnt get down to look at the CC. By the time I got down there it was showing about 54.4V. Did it not bother with absorb for some reason? Its set for 2hrs on the mate FX side. Not sure how to check/adjust that on the CC.
jtzako
Forum Whiz
Posts: 40
Joined: Sun Dec 27, 2020 12:45 pm
My RE system: OBPS Auto transformer PSX-240
2x Inverter VFX 3648
2x OBPS PS2DC Industrial Control Panel 3004905
OBPS MX - 60 MPPT Charge Controller
Kohler Generator 14RESA
1x OBPS Mate
15x Sharp ND-208U2 Solar Panels
16x Deka Pro Master 8L16T875 batteries

Re: Determining the correct settings for my system?

Post by jtzako »

Another update: Now it says 58.8 on the CC and is 'absorbing'. I'm not sure why there was a gap where it hit 58.8 on the FX, then gen shut down about 20 minutes later and dropped voltage down then at some point went back up again. (gen still off)
raysun
Forum Emperor
Posts: 4540
Joined: Tue Jul 26, 2016 5:57 am
My RE system: Flexpower Two: (2) FXR3048A, (2) FM80, MATE3s, FlexNetDC
SimpliPhi 48-3.8 (6 @ 48v)
Outback IBR3 battery enclosure
REC Alpha 440W panels - 2 arrays: each of 4 strings of 2 in series
Honda EU7000is gas fuel generator

Re: Determining the correct settings for my system?

Post by raysun »

jtzako wrote: Tue Jan 12, 2021 9:41 am
raysun wrote: Tue Jan 12, 2021 9:30 am
When the battery reaches 58.8, did the charge controllers indicate Absorb? Hopefully so.

The inverter charger may have gone idle at that point if its voltage readings indicated it had nothing to do. The generator would continue to provide current for house loads.
I didnt see it say absorb when it got up to 58.8. When it was showing 58.8 on the Mate it was a bit less than that still on the CC. Unfortunately when the generator turned off about 20 minutes later I was in the middle of some work and couldnt get down to look at the CC. By the time I got down there it was showing about 54.4V. Did it not bother with absorb for some reason? Its set for 2hrs on the mate FX side. Not sure how to check/adjust that on the CC.
I'm not sure where the Mate gets its battery voltage readings in the older systems but its either from an internal voltmeter, or from the voltmeter in the master inverter.

There should be a method to display the inverter voltage on the Mate, but I don't know the method on the older unit.

Likewise, I'm not conversant on the older MX charge controller, but the OUT voltage on the front panel display is its reading of the battery voltage. That reading should be compared to the actual battery voltage to understand its calibration precision.

The best way to determine is to measure the voltage at the battery +/- terminals, then measure the voltage at the charge controller's Bat +/- terminals. The two voltage readings should agree. Next, compare the measured voltage to the OUT voltage on the MX panel.

I don't know about the MX series, but the later FM series has a calibrate function in its configuration menus.

Also, the Absorb Volts and Absorb Time parameters can be set on the charge controller in its Battery Charging menu.
jtzako
Forum Whiz
Posts: 40
Joined: Sun Dec 27, 2020 12:45 pm
My RE system: OBPS Auto transformer PSX-240
2x Inverter VFX 3648
2x OBPS PS2DC Industrial Control Panel 3004905
OBPS MX - 60 MPPT Charge Controller
Kohler Generator 14RESA
1x OBPS Mate
15x Sharp ND-208U2 Solar Panels
16x Deka Pro Master 8L16T875 batteries

Re: Determining the correct settings for my system?

Post by jtzako »

sbrownian wrote: Tue Jan 12, 2021 9:16 am Are voltage readings across the individual mono blocks pretty much even?
When I checked them before changing the absorb/float settings they where all between 6.27 and 6.42 volts.
jtzako
Forum Whiz
Posts: 40
Joined: Sun Dec 27, 2020 12:45 pm
My RE system: OBPS Auto transformer PSX-240
2x Inverter VFX 3648
2x OBPS PS2DC Industrial Control Panel 3004905
OBPS MX - 60 MPPT Charge Controller
Kohler Generator 14RESA
1x OBPS Mate
15x Sharp ND-208U2 Solar Panels
16x Deka Pro Master 8L16T875 batteries

Re: Determining the correct settings for my system?

Post by jtzako »

raysun wrote: Tue Jan 12, 2021 10:20 am
jtzako wrote: Tue Jan 12, 2021 9:41 am
raysun wrote: Tue Jan 12, 2021 9:30 am
When the battery reaches 58.8, did the charge controllers indicate Absorb? Hopefully so.

The inverter charger may have gone idle at that point if its voltage readings indicated it had nothing to do. The generator would continue to provide current for house loads.
I didnt see it say absorb when it got up to 58.8. When it was showing 58.8 on the Mate it was a bit less than that still on the CC. Unfortunately when the generator turned off about 20 minutes later I was in the middle of some work and couldnt get down to look at the CC. By the time I got down there it was showing about 54.4V. Did it not bother with absorb for some reason? Its set for 2hrs on the mate FX side. Not sure how to check/adjust that on the CC.
I'm not sure where the Mate gets its battery voltage readings in the older systems but its either from an internal voltmeter, or from the voltmeter in the master inverter.

There should be a method to display the inverter voltage on the Mate, but I don't know the method on the older unit.

Likewise, I'm not conversant on the older MX charge controller, but the OUT voltage on the front panel display is its reading of the battery voltage. That reading should be compared to the actual battery voltage to understand its calibration precision.

The best way to determine is to measure the voltage at the battery +/- terminals, then measure the voltage at the charge controller's Bat +/- terminals. The two voltage readings should agree. Next, compare the measured voltage to the OUT voltage on the MX panel.

I don't know about the MX series, but the later FM series has a calibrate function in its configuration menus.

Also, the Absorb Volts and Absorb Time parameters can be set on the charge controller in its Battery Charging menu.
I found the cc absorb timer (max 4 hrs on) and calibration menu is there too. I'll have to read up on the right way to set that in case it is off. The Mate shows the same # for FX and CC but the actual CC screen is always showing lower than the Mate.
Post Reply