FLEXmax Charge Controllers

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String Sizing Tool for MX and FM Charge Controllers

Last post by raysun « Thu Nov 14, 2024 6:05 pm
Replies: 104
by administrator » Fri Jul 18, 2008 10:36 am
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104 Replies

1641477 Views

Last post by raysun
Thu Nov 14, 2024 6:05 pm

Topics

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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

10428 Views

Last post by Mike Curran
Sat Oct 10, 2026 6:25 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
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30 Replies

40952 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

8673 Views

Last post by JayHawk58
Mon Dec 29, 2025 12:15 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
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
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
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
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
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

14744 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
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
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
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
Is my Cut-Out Voltage to High

Last post by SumPowerRays « Sat Dec 28, 2024 10:22 am
Replies: 8
by aaarneson » Fri Dec 27, 2024 6:25 am

8 Replies

18801 Views

Last post by SumPowerRays
Sat Dec 28, 2024 10:22 am
Older Flex 60 mppt charger.

Last post by raysun « Sat Dec 07, 2024 10:40 am
Replies: 1
by Antennamon » Fri Nov 15, 2024 11:42 am

1 Replies

14581 Views

Last post by raysun
Sat Dec 07, 2024 10:40 am
I tried using the string sizer but it doesn't work.

Last post by raysun « Sat Dec 07, 2024 10:36 am
Replies: 1
by Wifoulay » Sun Nov 24, 2024 10:56 pm

1 Replies

14366 Views

Last post by raysun
Sat Dec 07, 2024 10:36 am
Felicity Solar Lithium Battery with Outback FM80

Last post by raysun « Sat Dec 07, 2024 10:23 am
Replies: 1
by galaxym20 » Fri Nov 29, 2024 1:46 pm

1 Replies

14092 Views

Last post by raysun
Sat Dec 07, 2024 10:23 am
No response to soft keys on FM60

Last post by jbakker « Tue Nov 26, 2024 9:54 am
Replies: 8
by Ncampion1 » Wed Nov 20, 2024 9:25 am

8 Replies

15723 Views

Last post by jbakker
Tue Nov 26, 2024 9:54 am
Where to purchase fm80 cooling fan

Last post by Johneb67 « Mon Nov 11, 2024 6:36 am
Replies: 2
by Johneb67 » Sun Nov 10, 2024 4:13 pm

2 Replies

13540 Views

Last post by Johneb67
Mon Nov 11, 2024 6:36 am
2 or 3 fm80's

Last post by Johneb67 « Sat Nov 02, 2024 7:23 am
Replies: 15
by Johneb67 » Thu May 02, 2024 10:14 am

15 Replies

20917 Views

Last post by Johneb67
Sat Nov 02, 2024 7:23 am
FM100 AFCI Faulting Out - Adjustable?

Last post by raysun « Thu Oct 24, 2024 8:53 pm
Replies: 5
by AltPowerRob » Mon Oct 21, 2024 4:59 pm

5 Replies

14957 Views

Last post by raysun
Thu Oct 24, 2024 8:53 pm
Overpaneling Safe Trip?

Last post by raysun « Wed Oct 09, 2024 2:01 pm
Replies: 13
by Echo5 » Fri May 03, 2024 3:06 am

13 Replies

19323 Views

Last post by raysun
Wed Oct 09, 2024 2:01 pm
FM80 showing input after sundown

Last post by shastatodd « Tue Oct 08, 2024 7:35 pm
Replies: 8
by shastatodd » Fri Sep 13, 2024 7:20 am

8 Replies

15545 Views

Last post by shastatodd
Tue Oct 08, 2024 7:35 pm
FLEXmax 80 electronic schematic

Last post by Sparkey « Sun Sep 22, 2024 9:32 am
Replies: 4
by dexterbot80 » Tue Aug 02, 2022 7:02 am

4 Replies

16093 Views

Last post by Sparkey
Sun Sep 22, 2024 9:32 am
FM 60 going into float at 75% charge?

Last post by raysun « Sat Sep 21, 2024 8:42 am
Replies: 3
by rewired » Thu Sep 19, 2024 6:15 am

3 Replies

14294 Views

Last post by raysun
Sat Sep 21, 2024 8:42 am
Bulk charge late pm

Last post by Lara2023 « Sat Aug 10, 2024 1:34 pm
Replies: 9
by Lara2023 » Fri Aug 09, 2024 7:20 pm

9 Replies

15981 Views

Last post by Lara2023
Sat Aug 10, 2024 1:34 pm
Flexmax80 and generator question

Last post by raysun « Tue Aug 06, 2024 9:51 am
Replies: 18
by aaarneson » Tue Aug 06, 2024 7:29 am

18 Replies

19184 Views

Last post by raysun
Tue Aug 06, 2024 9:51 am

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