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07-13-2014, 06:44 PM
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#1
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Member
Join Date: Jan 2013
Location: Marietta, GA
Posts: 91
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Battery Tender Hook-up
I have a new 21FBRS with two Trojan 6V deep cell batteries. I want to use a Black & Decker Battery Tender to look after my batteries because it shuts off when the batteries are full and turns on when required. I need to know the best way to connect it. Now, I have the FR 21FBRS system charger going with my shore power, which I don't need when I'm not using my trailer for a month or two. I need to disconnect the charger when I'm parking for awhile and reconnect when I hit the road. Some tech help please.
__________________
SPARKEY BOB
IBEW LU 613 Atlanta
Micro Lite 21 FBRS
Toyota Tundra
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07-13-2014, 07:02 PM
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#2
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Senior Member
Join Date: Mar 2014
Posts: 1,748
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Unplug from shore power and hook up your tender to the poss/neg terminals to one battery. The tender will maintain both.
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07-13-2014, 07:28 PM
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#3
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Senior Member
Join Date: Jul 2013
Location: BoCoMo
Posts: 2,784
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Unhook the batts from the unit as you will have parasite drainage.
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Brother Les
2013 Forest River Salem Hemisphere SBT312QBUD
2001 CrewCab F-250 7.3 PowerStroke Diesel
SuperChip, BTS transmission, 6.0 Trans Cooler
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07-13-2014, 07:33 PM
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#4
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Senior Member
Join Date: Sep 2010
Location: Eastern Ontario
Posts: 4,167
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Quote:
Originally Posted by Still Kickin
Unplug from shore power and hook up your tender to the poss/neg terminals to one battery. The tender will maintain both.
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Actually positive to one battery and negative to other battery as he has two 6 volts battery in series.
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Fonzie
2011 Rockwood 8319SS with ProPride 3P hitch/GoodYear Marathons/TST TPMS 507
2019 F350 Ruby Red 6.7l diesel 3.31 axle electronic locker
Yamaha 3000iseb generator:Progressive Ind. EMS-HW30C : Eastern Ontario
Nights Camped: 2014 (18) 2015 (18) 2016 (36) 2017 (32) 2018 (42) 2019 (28) 2020 (35)
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07-13-2014, 07:35 PM
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#5
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Senior Member
Join Date: Mar 2014
Posts: 1,748
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Not neccessary, since the tender will compensate for the parasitic drain. Done this exact procedure for three years now. House batteries are still in the "good range", after hydrometer check, even after many boondocking drawdowns to 50+%.
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07-13-2014, 07:50 PM
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#6
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Senior Member
Join Date: Jul 2013
Location: BoCoMo
Posts: 2,784
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Yes, the tender will charge more because of the power usage from the unit. Why not then just use the 'shore power" (which he is doing anyway with the tender but may be leaving the batts hooked to the unit) and keep the batts topped off with the convertor? No need for a tender then as the converter will power up and down as needed. Am I missing something?
__________________
Brother Les
2013 Forest River Salem Hemisphere SBT312QBUD
2001 CrewCab F-250 7.3 PowerStroke Diesel
SuperChip, BTS transmission, 6.0 Trans Cooler
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07-18-2014, 09:44 AM
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#7
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Member
Join Date: Jan 2013
Location: Marietta, GA
Posts: 91
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FR and Camping World and Trojan batteries all say; isolate the batteries (disconnect from shore power) and turn off all parasites. Set the maintenance keeper to 12V, connect Plus lead to one battery and minus lead to the other battery. Check water often.
__________________
SPARKEY BOB
IBEW LU 613 Atlanta
Micro Lite 21 FBRS
Toyota Tundra
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07-19-2014, 11:05 AM
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#8
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Senior Member
Join Date: Feb 2014
Posts: 125
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How do you "turn off all parasites" without completely disconnecting the battery(s)??
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07-19-2014, 11:07 AM
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#9
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Phat Phrog Stunt Team
Join Date: Aug 2011
Location: Iowa
Posts: 34,507
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Quote:
Originally Posted by Henboy
How do you "turn off all parasites" without completely disconnecting the battery(s)??
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There is no way to remove those parasitic drains other than.
1) unhook battery.
Or
2) install a battery disconnect.
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07-19-2014, 11:13 AM
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#10
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Senior Member
Join Date: Sep 2013
Location: Idaho
Posts: 9,839
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__________________
2016 F350 6.7L LB CC Reese 28K 2014 Chaparral Lite 266sab
"Those who would give up essential Liberty, to purchase a little temporary Safety, deserve neither Liberty nor Safety." 2014 19 days camping 2015 17 days camping201620 days camping
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07-20-2014, 07:25 PM
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#11
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Member
Join Date: Jan 2013
Location: Marietta, GA
Posts: 91
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My 21FBRS has a factory battery shut-off. To find out if you have one, disconnect the shore power and turn on lights. If a light comes on look by the electrical panel for a switch. On a 21 FBRS its a pull/push switch below the fridge. If you can use the switch and turn off lights, you have a battery isolation switch. On my old Sunline I installed one.
__________________
SPARKEY BOB
IBEW LU 613 Atlanta
Micro Lite 21 FBRS
Toyota Tundra
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07-22-2014, 11:11 AM
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#12
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Junior Member
Join Date: Jun 2011
Posts: 25
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Factory shore power charging will overcharge and dry the batteries. Tender is a much better choice. IMHO
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