MX60 Snoozing --> WakeUp --> Sweeping --> LowLight

Discussion about the MX60 Charge Controller

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mikeysklar
Forum Junior Member
Posts: 1
Joined: Tue Apr 16, 2019 12:28 pm
My RE system: GVFX3648 | MX60 MPPT | 4x12v GELs

MX60 Snoozing --> WakeUp --> Sweeping --> LowLight

Post by mikeysklar »

I've been transitioning my 2008 off-grid install into a 2019 grid-tie install. The trouble I'm having is that the charge controller is seeing my battery voltage and PV voltage, but refuses to bulk charge. The MX60 is stuck in a cycle of:

Snoozing --> WakeUp ---> Sweeping --> LowLight --> Snoozing

Once the relay clicks on WakeUp the PV voltage drops from 74v to battery voltage then the system switches to sweeping and the PV voltage climbs back up until the process repeats. I've seen this mentioned on several threads, but with no conclusion other than the the MX60 could be damaged.
Mike Curran
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Posts: 2272
Joined: Sat Aug 28, 2004 6:28 pm
My RE system: Outback - Garage roof:
- 8 (2x4) Evergreen 180's into one FM80 (2007/2020 - replaced MX60)
- 6 (2×3) ALEO S79-300's into one FM80 (2017)
- 2 grid-tied VFXR3524A-01's series stacked, replaced GVFX's (2020)
- 12 Surrette/Rolls 2V x 1766Ah (2007)
- Hub10.3, Mate3s, FNDC, RTS. Tigo ES maximizers on each PV module.

Westinghouse Solar - Barn roof: (2012)
- 30 (2x15) 235W panels with Enphase M215 microinverters, grid-tied

Outback Skybox - Barn roof: (2019)
- 14 Talesun 275W in series (DC array input to SB inverter/charger)
- 3 SimpliPhi 3.8 batteries, 48V, 225Ah total
- AC coupled input from 14 Talesun 275W, Enphase M215 microinverters

All self-designed and self-installed
Location: Chagrin Falls, Ohio

Re: MX60 Snoozing --> WakeUp --> Sweeping --> LowLight

Post by Mike Curran »

Definitely sounds like your MX60 is at fault.

This video shows how mine behaves from a dead startup- PV input breakers off, then turned on: https://youtu.be/dHQ7WI9_VzM

May not be directly applicable (it never goes through a sweep cycle in this scenario) but it does show that the PV voltage never drops to the battery voltage.

Sorry for the shaky video, trying to hold tablet cam in one hand while turning on breakers with the other :smile:
https://smart.tigoenergy.com/p/pZXn7SZQyO45?date=2021-04-19
https://enlighten.enphaseenergy.com/public/systems/Hctc107221
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