Adding second FLEXmax 100

Discussion about the FM100 AFCI Charge Controller
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Lara2023
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Joined: Sat Aug 05, 2023 5:48 pm
My RE system: Rolls Battery system 1780 ah, 11k watt panels with 6 charge controllers, Mate 3s

Adding second FLEXmax 100

Post by Lara2023 »

All, I’m replacing an older FLEXmax 80 with FLEXmax 100. I already have one FLEXmax 100 in operations connecting through Mate3s/Hub with the remaining FLEXmax 80’s charge controllers. Should the settings on the Mate3s for both FLEXmax 100’s be identical? Thanks in advance.
raysun
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My RE system: Flexpower Two: (2) FXR3048A-01 - Series 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: Adding second FLEXmax 100

Post by raysun »

Usually, all charge controllers would have the same settings in order to charge in sync.
Lara2023
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Posts: 9
Joined: Sat Aug 05, 2023 5:48 pm
My RE system: Rolls Battery system 1780 ah, 11k watt panels with 6 charge controllers, Mate 3s

Re: Adding second FLEXmax 100

Post by Lara2023 »

Thank you!
raysun
Forum Overlord
Posts: 10766
Joined: Tue Jul 26, 2016 5:57 am
My RE system: Flexpower Two: (2) FXR3048A-01 - Series 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: Adding second FLEXmax 100

Post by raysun »

One overall attribute to pay heed to is total charge current. It should not exceed the battery's specified charge rate.
The Electron
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My RE system: I troubleshoot & maintain off-grid systems in many different scenarios, a few are total redneck messes I stumble across, some are pretty nice. Experience with multiple stacked FX's and Radians & Optics
Location: Northwest Montana

Re: Adding second FLEXmax 100

Post by The Electron »

To get finer control/reporting of voltage, and better accuracy with bulk charge termination, calibrate the voltages in all of your Outback devices after proper torque of all fasteners in the entire connection scheme (don't assume any crimped cable lugs are OK until you run voltage drop across them with high amp flow). Then look at all these voltages again under high loads at night, and hard charging in the sun, etc etc. Then ya got a fighting chance that your numbers will be an accurate representation of what is actually happening
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