Outback fm 80 charge controller set up

Discussion about the FM100, FM80, and FM60 Charge Controllers

Moderators: OutBack, OutBack Moderator Team

raysun
Forum Emperor
Posts: 7777
Joined: Tue Jul 26, 2016 5:57 am
My RE system: Flexpower Two: (2) FXR3048A-01, (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
Honda EU7000is gas fuel generator

Re: Outback fm 80 charge controller set up

Post by raysun »

YardApe03@msn.com wrote: Sun Jan 09, 2022 8:24 pm How about the power max rv smart charger 75amp
I looked at that one again. A lot of bang for the buck. I am a bit leery of its charging 'smarts' for somewhat more 'fussy' gel cells. Flooded lead acid, no problem. AGM even. Gel needs more of a 'kid gloves' treatment IME.

The Victron seems to be a bit more 'intelligent' if not as muscular.
YardApe03@msn.com
Forum Expert
Posts: 61
Joined: Tue Nov 02, 2021 3:33 pm
My RE system: Flex max outback 80
8 - htl6-420(6v-420ah/20hr) cs power gel batteries
8- 425Q cells solar panels
24v fox power inverter charge 60amp

Re: Outback fm 80 charge controller set up

Post by YardApe03@msn.com »

How would a 9 amp smart charge be?
I did order the victron, but the 9amp can charge 4 12v batteries at once keeping all batteries charge in same sequence
raysun
Forum Emperor
Posts: 7777
Joined: Tue Jul 26, 2016 5:57 am
My RE system: Flexpower Two: (2) FXR3048A-01, (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
Honda EU7000is gas fuel generator

Re: Outback fm 80 charge controller set up

Post by raysun »

YardApe03@msn.com wrote: Sun Jan 16, 2022 12:40 pm How would a 9 amp smart charge be?
I did order the victron, but the 9amp can charge 4 12v batteries at once keeping all batteries charge in same sequence
Would this be a 4 bank charger for use at the cabin to charge all 8 monoblocs in place there?
YardApe03@msn.com
Forum Expert
Posts: 61
Joined: Tue Nov 02, 2021 3:33 pm
My RE system: Flex max outback 80
8 - htl6-420(6v-420ah/20hr) cs power gel batteries
8- 425Q cells solar panels
24v fox power inverter charge 60amp

Re: Outback fm 80 charge controller set up

Post by YardApe03@msn.com »

It probably could on a generator for 2 days
Or I might just bring them home and put them in the garage and charge them up. Run the generator rest of winter until I can get system set up properly after winter
raysun
Forum Emperor
Posts: 7777
Joined: Tue Jul 26, 2016 5:57 am
My RE system: Flexpower Two: (2) FXR3048A-01, (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
Honda EU7000is gas fuel generator

Re: Outback fm 80 charge controller set up

Post by raysun »

In essence the 4 bank charger would be capable of 18A per parallel string (x2 = 36A total net charge.)

With the 840AH battery, 36A would be about 4% charge rate. The specs call out 150A, or 17% as the maximum charge rate. If the battery was at 50% SoC, it would take the charger a very long time to being the battery to full charge.
840AH x 50% = 420AH ÷ 36A = 11.67H. Add 10% for charge efficiency, 11.67H + 10% = 12.8 Hours to charge. That would be with no load on the battery.

Using the 4 bank charger in parallel with the inverter charger would add more charging amperage to the total, however, IME, most automatic smart chargers get highly confused in such a setup and don't deliver as expected.
YardApe03@msn.com
Forum Expert
Posts: 61
Joined: Tue Nov 02, 2021 3:33 pm
My RE system: Flex max outback 80
8 - htl6-420(6v-420ah/20hr) cs power gel batteries
8- 425Q cells solar panels
24v fox power inverter charge 60amp

Re: Outback fm 80 charge controller set up

Post by YardApe03@msn.com »

Yes I was just thinking pulling all loads off it and charging them for the 12-13 hrs
raysun
Forum Emperor
Posts: 7777
Joined: Tue Jul 26, 2016 5:57 am
My RE system: Flexpower Two: (2) FXR3048A-01, (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
Honda EU7000is gas fuel generator

Re: Outback fm 80 charge controller set up

Post by raysun »

That sounds about right.
YardApe03@msn.com
Forum Expert
Posts: 61
Joined: Tue Nov 02, 2021 3:33 pm
My RE system: Flex max outback 80
8 - htl6-420(6v-420ah/20hr) cs power gel batteries
8- 425Q cells solar panels
24v fox power inverter charge 60amp

Re: Outback fm 80 charge controller set up

Post by YardApe03@msn.com »

Been a long time
So ok I bought the victron charger
Brought all the batteries home to charge and the smart charger goes directly to absorption mode and chargers the batteries at 14.88v in the garage but the amps stays at 0.6 amps to 1 amp constantly through absorption
Does this mean the batteries are full?
They don’t even charge in bulk goes directly to absorption
This was the same thing as at the cabin not much bill charge unless they had a load on them all night
Not complaining as they are getting a goods charge at home this way I guess
raysun
Forum Emperor
Posts: 7777
Joined: Tue Jul 26, 2016 5:57 am
My RE system: Flexpower Two: (2) FXR3048A-01, (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
Honda EU7000is gas fuel generator

Re: Outback fm 80 charge controller set up

Post by raysun »

I'd say yes, the battery charger is triggered by voltage. If the voltage rises to the Absorb target, it will enter that stage. If the battery is fully charged, it will accept only a low rate of current.
YardApe03@msn.com
Forum Expert
Posts: 61
Joined: Tue Nov 02, 2021 3:33 pm
My RE system: Flex max outback 80
8 - htl6-420(6v-420ah/20hr) cs power gel batteries
8- 425Q cells solar panels
24v fox power inverter charge 60amp

Re: Outback fm 80 charge controller set up

Post by YardApe03@msn.com »

At least I know now the solar system is charging the battery with this charger
I wasn’t sure before but winter months we haven’t been using it as much, snow will be gone soon and I will set up 48v in my shed with 9 panels of 425w
raysun
Forum Emperor
Posts: 7777
Joined: Tue Jul 26, 2016 5:57 am
My RE system: Flexpower Two: (2) FXR3048A-01, (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
Honda EU7000is gas fuel generator

Re: Outback fm 80 charge controller set up

Post by raysun »

Sounds like a good project.
9 panels of 425w
If thats destined to feed a 150V controller like the FM80, be mindful of the V(oc) and potential for maximum array voltage. 9 panels sounds like a 3 X 3 array. 425W sounds like panels with V(oc) >> 40V. e.g. If V(oc) = 45V, then 3 in series= 135V, leaving 15V "buffer". On a cold, clear winter morning with temperatures around 0°C or lower, the V(oc) could rise above the 150V limit of the controller.

Just some calculations to double check for the locale.
YardApe03@msn.com
Forum Expert
Posts: 61
Joined: Tue Nov 02, 2021 3:33 pm
My RE system: Flex max outback 80
8 - htl6-420(6v-420ah/20hr) cs power gel batteries
8- 425Q cells solar panels
24v fox power inverter charge 60amp

Re: Outback fm 80 charge controller set up

Post by YardApe03@msn.com »

Yes I’d have to go 10 quite possible or 8
2x2-4 series banks paralleled

Should gel batteries be reconditioned or equalized? Some say you can do it but it drys out the electrolytes of the batteries creating shorter life span and some say don’t do it like rolls
I was going to equalize the batteries before they go back to the cabin, but at storage mode the batteries are all 6.66volts or 13.34volts in 12v series banks, I thought those are very good readings after being dormant for 24hrs
raysun
Forum Emperor
Posts: 7777
Joined: Tue Jul 26, 2016 5:57 am
My RE system: Flexpower Two: (2) FXR3048A-01, (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
Honda EU7000is gas fuel generator

Re: Outback fm 80 charge controller set up

Post by raysun »

IMO, Gel batteries should not be equalized. Any gassing would result in bubbles trapped in the electrolyte, reducing contact with the lead plates, and permanent capacity loss.

No sealed battery should be equalized in the manner of a flooded battery.
YardApe03@msn.com
Forum Expert
Posts: 61
Joined: Tue Nov 02, 2021 3:33 pm
My RE system: Flex max outback 80
8 - htl6-420(6v-420ah/20hr) cs power gel batteries
8- 425Q cells solar panels
24v fox power inverter charge 60amp

Re: Outback fm 80 charge controller set up

Post by YardApe03@msn.com »

I know in general electrical it is good practice to ground the negative bus bar to the ground bus bar to prevent the spark when putting connections together I assume this is good practice for solar batteries as well after the shunt ?
raysun
Forum Emperor
Posts: 7777
Joined: Tue Jul 26, 2016 5:57 am
My RE system: Flexpower Two: (2) FXR3048A-01, (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
Honda EU7000is gas fuel generator

Re: Outback fm 80 charge controller set up

Post by raysun »

The Outback system wiring diagrams don't explicitly show battery negative connected to ground.

However, the battery negative does generally define the minimum potential point, and connecting it to ground does accomplish that.

Perhaps one or the installation electricians on the forum will weigh in on best practices.
Post Reply