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Old 10-06-2014, 10:49 AM   #1
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Battery Tender charging batteries

When using Tender to charge chassis batteries (2 in parallel ), is it ok to leave them connected inside the coach when charging. The tender web sight indicated using the blue wire. What the heck is the blue wire?. It did mention using the blue wire if using a 10amp charger. Tender is 12v-1.25A.
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Old 10-06-2014, 11:46 AM   #2
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Battery Tender charging batteries

Voltage of batt's? And, you're hooked right up to the battery(ies) with correct polarity? The battery tenders I use, on motorcycles, are pretty straightforward. Hook pos to pos and neg to neg and turn on. The nicer one has a float cycle.

You should be ok leaving them on. Is anything 12v running? The tender may not be able to keep up. Do you normally do the disconnect switch when you leave the unit? If so, that way the tender should be able to keep up for sure, with no load.


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Old 10-06-2014, 11:52 AM   #3
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The "Blue wire" on the Battery Tender instructions (labeled W1) is added to balance the load when charging parallel connected batteries (positives to positives and negatives to negatives)...but not needed for low current chargers - see:
http://batterytender.com/resources/c...-chargers.htm/
This wire diagram in the instructions is just a way for Battery Tender to ensure you connect the charger to the correct negative lead to ensure proper load balance.

I believe you can leave the BatteryTender connected on the batteries while running the engine/generator - but it is usually a good idea to remove the BatteryTender from 110AC before starting the engine to protect it from the high amp charge that is possible from the engine.

I do not risk my Battery Tender and remove both ends (unplug from the 110 and unplug 12VDC w/ the quick release plug on the 12VDC wires) before starting the engine/generator.

Best luck
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Old 10-06-2014, 02:50 PM   #4
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I always take the pos cable off, before using battery tender.
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Old 10-06-2014, 04:04 PM   #5
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Thanks for the advice
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Old 10-06-2014, 04:15 PM   #6
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Tiffen uses the battery minder/tender as their OEM solution for keeping the chassis bats charged...Havent looked that closely to see if they have installed diodes or anything but it appears they are plugged-in 24/7, 365??
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Old 10-06-2014, 11:17 PM   #7
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Quote:
Originally Posted by dvmweb View Post
Voltage of batt's? And, you're hooked right up to the battery(ies) with correct polarity? The battery tenders I use, on motorcycles, are pretty straightforward. Hook pos to pos and neg to neg and turn on. The nicer one has a float cycle.

You should be ok leaving them on. Is anything 12v running? The tender may not be able to keep up. Do you normally do the disconnect switch when you leave the unit? If so, that way the tender should be able to keep up for sure, with no load.


2013 FleetWood Expedition 38B

Thanks for the advice
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