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FLEXmax Charge Controllers
Discussion about the FM100, FM80, and FM60 Charge Controllers
Moderators: OutBack Moderator Team, OutBack
Topics: 1260

1260 Topics

9587 Posts

Last post Re: FM100 Loses Settings / Hi…
by Mike Curran View the latest post
Sat Oct 10, 2026 6:25 pm
FLEXmax 100 AFCI
Discussion about the FM100 AFCI Charge Controller
Topics: 53

53 Topics

415 Posts

Last post Re: Suggestions for New Array…
by shoot24p View the latest post
Sat Sep 12, 2026 11:02 am
MX60 Charge Controller
Discussion about the MX60 Charge Controller
Moderators: OutBack Moderator Team, OutBack
Topics: 884

884 Topics

5998 Posts

Last post Re: Current thoughts on using…
by DarkForestSolar View the latest post
Thu Jul 04, 2024 3:54 pm

Active topics

Replies

Views

Last post

FM100 Loses Settings / History When Power Cycled

Last post by Mike Curran « Sat Oct 10, 2026 6:25 pm
Replies: 20
by bikermiker » Wed Mar 18, 2026 11:07 am

20 Replies

10429 Views

Last post by Mike Curran
Sat Oct 10, 2026 6:25 pm
Suggestions for New Array with (2) FM100s

Last post by shoot24p « Sat Sep 12, 2026 11:02 am
Replies: 7
by shoot24p » Fri Sep 11, 2026 3:01 pm

7 Replies

432 Views

Last post by shoot24p
Sat Sep 12, 2026 11:02 am
FM100 Fan replacement

Last post by chrisski « Thu Sep 10, 2026 3:12 pm
Replies: 2
by joseo_collazo » Sat May 09, 2026 3:32 pm

2 Replies

12702 Views

Last post by chrisski
Thu Sep 10, 2026 3:12 pm
Unequal charge after adding LiFePo batteries

Last post by raysun « Tue Aug 25, 2026 5:28 pm
Replies: 4
by GSmith » Mon Aug 24, 2026 6:02 pm

4 Replies

513 Views

Last post by raysun
Tue Aug 25, 2026 5:28 pm
Charge Controllers not activating

Last post by Echo5 « Fri Jul 17, 2026 10:28 am
Replies: 4
by Echo5 » Thu Jul 16, 2026 8:28 am

4 Replies

1065 Views

Last post by Echo5
Fri Jul 17, 2026 10:28 am
planning to replace lead acid batteries

Last post by raysun « Mon Jun 29, 2026 11:10 pm
Replies: 1
by vincjwan » Mon Jun 29, 2026 4:35 am

1 Replies

7877 Views

Last post by raysun
Mon Jun 29, 2026 11:10 pm
2 Fm80 synchronisation

Last post by raysun « Fri Jun 05, 2026 8:40 am
Replies: 1
by vincjwan » Fri Jun 05, 2026 3:01 am

1 Replies

5936 Views

Last post by raysun
Fri Jun 05, 2026 8:40 am
500w panels on an FM80

Last post by raysun « Tue May 12, 2026 2:13 pm
Replies: 10
by Johneb67 » Mon May 11, 2026 10:34 am

10 Replies

7758 Views

Last post by raysun
Tue May 12, 2026 2:13 pm
fm 80 Accumulated Values for Lifetime kWh reset

Last post by raysun « Sat May 02, 2026 10:36 am
Replies: 1
by shastatodd » Sat May 02, 2026 6:45 am

1 Replies

6726 Views

Last post by raysun
Sat May 02, 2026 10:36 am
charging lithium zte zxdc48fb100b3 batteries

Last post by raysun « Sat Apr 25, 2026 3:02 pm
Replies: 4
by Evan » Tue Apr 07, 2026 2:37 pm

4 Replies

7490 Views

Last post by raysun
Sat Apr 25, 2026 3:02 pm
Overpanelling Via Input Current Clipping

Last post by raysun « Mon Mar 02, 2026 6:41 am
Replies: 16
by Echo5 » Thu Oct 10, 2024 2:08 am

16 Replies

22443 Views

Last post by raysun
Mon Mar 02, 2026 6:41 am
Overvoltage and now eratic behavior

Last post by raysun « Thu Feb 26, 2026 12:29 pm
Replies: 3
by CaribSnake » Thu Feb 26, 2026 8:58 am

3 Replies

7285 Views

Last post by raysun
Thu Feb 26, 2026 12:29 pm
FM80/60 calibration

Last post by raysun « Wed Feb 25, 2026 10:18 pm
Replies: 23
by raysun » Mon Aug 17, 2020 10:18 am

23 Replies

19523 Views

Last post by raysun
Wed Feb 25, 2026 10:18 pm
FM80 no Amps

Last post by raysun « Tue Feb 24, 2026 7:06 pm
Replies: 3
by Bendesa1962 » Mon Feb 23, 2026 9:58 pm

3 Replies

7179 Views

Last post by raysun
Tue Feb 24, 2026 7:06 pm
not switching to absorb charge as programed

Last post by raysun « Thu Feb 19, 2026 1:25 pm
Replies: 3
by Aore Adventures » Thu Feb 19, 2026 1:44 am

3 Replies

7191 Views

Last post by raysun
Thu Feb 19, 2026 1:25 pm
FM80 goes to Charged and stops charging the batteries

Last post by OnTheBeach « Fri Feb 06, 2026 6:21 am
Replies: 30
by jose » Fri Jul 22, 2016 9:05 am
1

2
30 Replies

40953 Views

Last post by OnTheBeach
Fri Feb 06, 2026 6:21 am
Used FM80

Last post by khvi « Thu Feb 05, 2026 3:22 am

by khvi » Thu Feb 05, 2026 3:22 am

0 Replies

7043 Views

Last post by khvi
Thu Feb 05, 2026 3:22 am
Adding an additional charge controller

Last post by JayHawk58 « Mon Dec 29, 2025 12:15 pm
Replies: 3
by JayHawk58 » Tue Dec 23, 2025 12:02 pm

3 Replies

8674 Views

Last post by JayHawk58
Mon Dec 29, 2025 12:15 pm
FM 100 solar panels series and parallel

Last post by chrisski « Sun Dec 28, 2025 7:57 pm
Replies: 13
by Lara2023 » Sat Dec 27, 2025 6:03 pm

13 Replies

11168 Views

Last post by chrisski
Sun Dec 28, 2025 7:57 pm
Master, slave or independent

Last post by raysun « Mon Dec 08, 2025 11:58 am
Replies: 13
by jainsw » Sun Dec 07, 2025 2:49 pm

13 Replies

12393 Views

Last post by raysun
Mon Dec 08, 2025 11:58 am
Charge controller settings

Last post by JRKsolar « Sat Dec 06, 2025 12:14 pm
Replies: 2
by vols34 » Fri Dec 05, 2025 12:59 pm

2 Replies

8576 Views

Last post by JRKsolar
Sat Dec 06, 2025 12:14 pm
FM100 resets to factory defaults after power cycle

Last post by dtich « Tue Dec 02, 2025 10:59 am
Replies: 3
by Specialist » Sun Sep 28, 2025 8:30 pm

3 Replies

15155 Views

Last post by dtich
Tue Dec 02, 2025 10:59 am
Fm 80 giving me weird readings

Last post by raysun « Wed Oct 29, 2025 10:43 am
Replies: 5
by rickdemers » Mon Oct 27, 2025 10:36 am

5 Replies

14250 Views

Last post by raysun
Wed Oct 29, 2025 10:43 am
Red led on fm100

Last post by annata20 « Mon Oct 13, 2025 9:30 am
Replies: 2
by Bill72 » Fri Aug 16, 2024 6:14 am

2 Replies

20300 Views

Last post by annata20
Mon Oct 13, 2025 9:30 am
Error Message FM80 battery temp to hot No sensor

Last post by raysun « Sat Sep 27, 2025 7:16 pm
Replies: 8
by Bendesa1962 » Thu Sep 25, 2025 12:19 am

8 Replies

16202 Views

Last post by raysun
Sat Sep 27, 2025 7:16 pm
Can't complete an Absorb Mode cycle any longer

Last post by raysun « Wed Sep 24, 2025 3:07 pm
Replies: 1
by Pablo Rasta » Mon Sep 22, 2025 3:28 pm

1 Replies

13493 Views

Last post by raysun
Wed Sep 24, 2025 3:07 pm
Possible incorrect charge controller setting?

Last post by AlohaLife « Wed Sep 10, 2025 3:29 pm
Replies: 2
by AlohaLife » Wed Sep 10, 2025 12:50 pm

2 Replies

13479 Views

Last post by AlohaLife
Wed Sep 10, 2025 3:29 pm
arc fault

Last post by raysun « Sat Sep 06, 2025 2:13 pm
Replies: 29
by dtich » Fri Aug 01, 2025 8:26 am
1

2
29 Replies

54962 Views

Last post by raysun
Sat Sep 06, 2025 2:13 pm
Panel Array Addition Flexmax 80

Last post by raysun « Tue Sep 02, 2025 8:24 am
Replies: 7
by clark99w » Tue Aug 26, 2025 11:01 am

7 Replies

15325 Views

Last post by raysun
Tue Sep 02, 2025 8:24 am
Smoke tested FM80. Now what?

Last post by raysun « Mon Aug 18, 2025 11:04 pm
Replies: 13
by Aircooled356 » Sun Jan 05, 2020 2:20 pm

13 Replies

22999 Views

Last post by raysun
Mon Aug 18, 2025 11:04 pm
MX60 FM60 FM80 MATE2 button fix

Last post by SumPowerRays « Mon Aug 18, 2025 8:59 am
Replies: 3
by summerswood » Sat Aug 16, 2025 9:41 pm

3 Replies

13373 Views

Last post by SumPowerRays
Mon Aug 18, 2025 8:59 am
Array wattage for Mate3

Last post by JRKsolar « Wed Aug 13, 2025 9:34 am
Replies: 9
by rickd » Tue Jul 01, 2025 2:58 pm

9 Replies

16787 Views

Last post by JRKsolar
Wed Aug 13, 2025 9:34 am
FM80 configured for LiFePO4

Last post by x6m39 « Sun Jul 06, 2025 2:45 pm
Replies: 2
by x6m39 » Sun Jul 06, 2025 1:54 pm

2 Replies

14951 Views

Last post by x6m39
Sun Jul 06, 2025 2:45 pm
Output of individual controllers

Last post by clarkef « Sun Jul 06, 2025 12:22 pm
Replies: 8
by rickd » Tue Jul 01, 2025 3:07 pm

8 Replies

17552 Views

Last post by clarkef
Sun Jul 06, 2025 12:22 pm
FM60 Error when making adjustments via OpticsRE.

Last post by Yoe « Sat Jun 21, 2025 4:33 am
Replies: 4
by Yoe » Thu Jun 19, 2025 6:42 am

4 Replies

14746 Views

Last post by Yoe
Sat Jun 21, 2025 4:33 am
Adding a 3rd FM 80

Last post by bigjimchest « Tue Jun 03, 2025 5:26 am
Replies: 9
by hrosendahl » Fri Dec 09, 2022 8:25 am

9 Replies

18631 Views

Last post by bigjimchest
Tue Jun 03, 2025 5:26 am
Batteries won’t stay at full change after reaching float.

Last post by SumPowerRays « Sun May 25, 2025 2:40 pm
Replies: 2
by Jarvis442 » Thu May 22, 2025 3:37 pm

2 Replies

14589 Views

Last post by SumPowerRays
Sun May 25, 2025 2:40 pm
Firmware 002.001.000, Does anyone have a copy?

Last post by raysun « Thu May 22, 2025 10:56 am
Replies: 3
by cobratom » Thu May 22, 2025 5:37 am

3 Replies

15235 Views

Last post by raysun
Thu May 22, 2025 10:56 am
flex mate 100

Last post by raysun « Thu May 22, 2025 10:45 am
Replies: 2
by Aore Adventures » Wed May 21, 2025 11:17 pm

2 Replies

14860 Views

Last post by raysun
Thu May 22, 2025 10:45 am
unexpected reset to fact defaults

Last post by dtich « Thu May 22, 2025 9:08 am
Replies: 6
by dtich » Sat May 17, 2025 6:16 am

6 Replies

15521 Views

Last post by dtich
Thu May 22, 2025 9:08 am
Float coordination - Issues

Last post by Lara2023 « Tue May 13, 2025 6:28 am
Replies: 28
by Lara2023 » Sun Mar 30, 2025 3:59 pm
1

2
28 Replies

51642 Views

Last post by Lara2023
Tue May 13, 2025 6:28 am
Multiple FM100 AFCI

Last post by clarkef « Sat May 03, 2025 12:56 pm
Replies: 13
by Lara2023 » Sun Jan 26, 2025 5:37 pm

13 Replies

20366 Views

Last post by clarkef
Sat May 03, 2025 12:56 pm
My FLEXmax 80 blew up.

Last post by raysun « Thu Mar 27, 2025 12:29 pm
Replies: 6
by SeismicCWave » Wed Mar 26, 2025 2:14 pm

6 Replies

17343 Views

Last post by raysun
Thu Mar 27, 2025 12:29 pm
Sting Sizing

Last post by Aore Adventures « Mon Mar 24, 2025 1:45 am
Replies: 8
by Aore Adventures » Sun Mar 23, 2025 3:27 pm

8 Replies

20114 Views

Last post by Aore Adventures
Mon Mar 24, 2025 1:45 am
Settings for FM80 with Fogstar battery

Last post by JRKsolar « Sat Mar 22, 2025 8:10 am
Replies: 8
by darrenptalbot » Fri Mar 21, 2025 3:08 am

8 Replies

19208 Views

Last post by JRKsolar
Sat Mar 22, 2025 8:10 am
FM60 and FM80 with new panels question

Last post by AlohaLife « Sun Mar 02, 2025 8:54 pm
Replies: 4
by AlohaLife » Sun Mar 02, 2025 2:15 pm

4 Replies

17829 Views

Last post by AlohaLife
Sun Mar 02, 2025 8:54 pm
Battery Voltage Input

Last post by SumPowerRays « Mon Feb 24, 2025 5:50 am
Replies: 3
by JonK » Sun Feb 23, 2025 12:26 pm

3 Replies

19476 Views

Last post by SumPowerRays
Mon Feb 24, 2025 5:50 am
FM80 behaviour when batteries deplete

Last post by raysun « Wed Feb 12, 2025 11:47 am
Replies: 3
by johntaylor » Fri Dec 13, 2024 1:40 pm

3 Replies

17559 Views

Last post by raysun
Wed Feb 12, 2025 11:47 am
FM60 won't come out of sleep mode

Last post by raysun « Thu Jan 16, 2025 12:47 pm
Replies: 6
by Jandptee2 » Thu Aug 15, 2024 6:01 pm

6 Replies

19124 Views

Last post by raysun
Thu Jan 16, 2025 12:47 pm
sudden and unexpected large number of notifications from FM100 AFCI

Last post by dasamara « Tue Jan 14, 2025 1:50 pm
Replies: 8
by dasamara » Wed Jul 17, 2024 9:24 am

8 Replies

21122 Views

Last post by dasamara
Tue Jan 14, 2025 1:50 pm

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