MX60 Solar Charge controller used for overlanding

Discussion about the MX60 Charge Controller

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Tron
Forum Junior Member
Posts: 2
Joined: Wed Apr 22, 2020 1:23 am
My RE system: MX60 PV MPPT charge controller used for over landing 12V power requirements. PV array is 3X 17V solar panels. Battery Bank consists of 2X 154Ah LiFePO4 batteries.

MX60 Solar Charge controller used for overlanding

Post by Tron » Thu Apr 23, 2020 5:42 am

Hi All, I hope you can give me some guidance on using the MX60 to charge LiFePO4 batteries when doing overlanding trips.

My set up is as follows:
  • 18V (22VOC) solar array of 3X 80Wp 4.44A
  • MX60 charge controller
  • 2X 13V 154Ah Blue Nova LiFePO4 batteries
I have used the MX60 before as part (solar charge) of a set up in my Land Rover Defender (since 2003) with a 48V 200Wp solar panel charging 2X 12V High Cycle 1250 batteries. It worked well but I now wish to rig out a off road trailer as described above.

My questions/statements (sorry I am no Pro) are:
  • The MX60 automatically selects the PV input Voltage and thus no setting changes required. What about the output charge values?
  • Can I manually change the charge settings for the LiFePO4 batteries? I am led to believe that the batteries require Bulk at 14.2V, Float at 13.7 and Absorption at (??)
Any recommendations or comments on these values PLEASE.

Also, help on how to change these charge settings if need be?

Mike Curran
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Posts: 1511
Joined: Sat Aug 28, 2004 6:28 pm
My RE system: Outback - Garage roof:
- 8 (2x4) Evergreen 180's into one FM80 (2007/2020 repl'd MX60)
- 6 (2×3) ALEO S79-300's into one FM80 (2017)
- 2 grid-tied GVFX3524's classic stacked for 120/240VAC (2007)
- 12 Surrette/Rolls 2V x 1766Ah (2007)
- Hub10.3, Mate3s, FNDC, RTS, OpticsRE. Tigo Energy ES maximizers on each PV module.

Westinghouse Solar - Barn roof: (2012)
- 30 (2x15) 235W panels with Enphase M215 microinverters, grid-tied, no longer AC- coupled

Outback Skybox - Barn roof: (2019)
- 14 (2x7) Talesun 275W (DC array input to SB charger)
- 3 SimpliPhi 3.8 batteries, 48V, 225Ah total
- AC coupled input from 14 Talesun 275W, Enphase M215 modules

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

Re: MX60 Solar Charge controller used for overlanding

Post by Mike Curran » Thu Apr 23, 2020 2:56 pm

My questions/statements (sorry I am no Pro) are:
The MX60 automatically selects the PV input Voltage and thus no setting changes required. What about the output charge values?
You have to program them into the MX60. It does have default settings for them, but they're not meant for LiFePO4 batteries.
Can I manually change the charge settings for the LiFePO4 batteries? I am led to believe that the batteries require Bulk at 14.2V, Float at 13.7 and Absorption at (??)
Of course you can do this in the MX60, if that's what you're referring to. You only program the absorb setting, bulk is just an intermediate charging stage on the way to reaching the absorb voltage setpoint. I don't recall how the MX60 labels the absorb voltage setting, whether they call it bulk or absorb they're basically the same, so your14.2 would be the correct setting for whatever the MX60 calls it. You will also need to program absorb time into your MX60, your battery manufacturer should have a spec for this.
http://www.tigoenergy.com/site.php?95b2dca2-ca6c
https://enlighten.enphaseenergy.com/public/systems/Hctc107221

Tron
Forum Junior Member
Posts: 2
Joined: Wed Apr 22, 2020 1:23 am
My RE system: MX60 PV MPPT charge controller used for over landing 12V power requirements. PV array is 3X 17V solar panels. Battery Bank consists of 2X 154Ah LiFePO4 batteries.

Re: MX60 Solar Charge controller used for overlanding

Post by Tron » Mon Apr 27, 2020 12:43 am

Thanx so much Mike.

Just to clarify: Input PV values not, but outputs yes as per your quote
You have to program them into the MX60.

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