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Old 09-05-2019, 10:23 AM   #22
rickst29
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Join Date: Aug 2005
Location: Reno, NV
Posts: 1,318
Lightbulb MPPT Solar Charge Parameters (also with Battleborn Values)

I modified "Boost Setting" and "Float Setting". (I set Equalize Voltage == Boost Voltage, and also set equalize time to zero minutes.) Boost = 14.6v, and Float = 13.7v. I also extended the maximum Boost time to 180 minutes.

There is actually very little increase in power storage when pushing the battery above 14.1v, and it hurts the lifespan to keep the battery fully charged all the time. "Float" doesn't actually go into the battery - nearly all of it gets consumed by "phantom loads". IIRC, I set the "Boost Resume" at 13.4v. That's a bit too high; next time I have it out, I will reduce that to 13.2v.
- - - Edit, 6/25/20 - - -
Before my most recent trip a couple weeks ago, I reduced "Boost Resume" to 13.2V. Today I saw that Battle Born batteries has made recommendations for programming the EPEVER controllers, and their figures are nearly the same as mine:

Over Voltage Disconnect 14.7 V
Charging Limit Voltage 14.6 V
Over Voltage Reconnect 14.6 V
Equalize Charging Voltage - shut off or 14.4 V (with 0 duration 'equalization time)
Boost Charging Voltage 14.6 V
Float Charging Voltage 13.6 V
Boost Reconnect 13.3 V
Low Voltage Reconnect 10
Under Voltage Warning Reconnect Voltage 11.5
Under Voltage Warning 11.5
Low Voltage Disconnect 11.0
Discharging Limit Voltage 10.5
Equalize Duration 0 or set as low as possible
Boost Duration 180 minutes

I feel that their 'Float Charging Voltage' value seems better than mine, but their 'Boost Recoonect' is slightly high - I'm leaving mine at 13.2V, they switch back to "Boost Mode" a bit too aggressively IMO.
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TM='06 2619 w/5K axle, 15" Maxxis "E" tires. Plumbing protector. 630 watts solar. 450AH LiFePO4 batteries, 3500 watt inverter. CR-1110 E-F/S fridge (compressor).
TV = 2007 4runner sport, with a 36 volt "power boost".
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