Advice Request Using my Victron 712 w/ Thermocouple option with (2) 6V AGM in Series for RV application.

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grievousangel asked May 26, '19

Advice Request Using my Victron 712 w/ Thermocouple option with (2) 6V AGM in Series for RV application.

(2) XTR6-235 in Series for a 12V Battery Bank. I understand the details about the 712 but I want to be sure that I'm getting most out of the 712 while protecting the battery life, etc. I included the manufacturers specs on the VMAX XTR6-235.

Please recommend 712 settings when installed. I have a new Jayco 2018 Hummingbird 19RK with Renogy Commander 40 w/ (2) 100W solar panel charge system; AIMS 120VAC/12VDC 6Kw Global Sine Wave Inverter-Charger-Transfer; plus a Progressive Dynamics PD-90280 Converter w/ Charge Wizard as backup for the AIMS Inverter. I feel I do not have enough batteries, but tongue weight dictates # of batteries.

Thanks for the input advice,

Billy

XTR6-235
Superior Plates with an expected life span of10to12years in float service applications.

Nominal Voltage	20Hr Capacity	CCA	MCA	RC (min)	Energy (kWH)	Terminal Posts	Dimensions	Weight	Charging Current*	Charging Voltage	Float Voltage
6V	235AH	1100A	1400A	500	1.620	SAE+5/16" STUD	10.2"w x 7.1"d x 10.2"h/10.8th**	78lb	15A-65A	7.2V-7.35V	6.8V-6.9V

25A @ 1.75/Cell 500 Min
75A @ 1.75/Cell 130 Min

Recommended Charging Options:

AC Chargers:Any Quality Brand AGM-Smart & Microprocessor controlled- charger with the recommended specs above can be used.Battery Charger Guide.
Solar Panel: 175W-450W(120W may be used if Depth of Discharge would not exceed 50%).

Operating Temperature Range:

Discharge: -4~140F
Charge: 14~140F
Storage: -4~140F

Temperature Compensation:

Cycle use:-15mV/C
Standby use: -10mV/C

battery

1

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grievousangel commented · May 30, 2019 at 01:34 PM

Was my question clear? I haven't received a reply yet. I may should have purchased 12V batteries in place of 6v in series ....

Billy

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Answer 1 · 2019-05-31T14:15:31Z

Mark answered · May 31, 2019 at 02:15 PM

There is nothing wrong with using 6v batteries - I use them myself in a 24v system.

Just connect the BMV-712 as per instructions with the temperature sensor connected to the positive of the 1st 6v battery. The temp sensor doubles as the positive connection so the other supplied cables are not required.

In terms of settings - just program the capacity, charged voltage (about 0.2v to 0.4v under the charger absorption voltage), tail current (about 2 to 4%), charged detection time (about 2 to 5 min), Peukert Exponent (about 1.25 for lead batteries & about 1.05 for lithium batteries) & charge efficiency factor (about 95% for lead batteries & about 98% for lithium batteries).

You might not get the settings perfect first go, but once you monitor the SOC% behavior over time and understand what setting does what you can tweak the parameters over time.

2 |3000

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