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Open Roads Forum  >  Class C Motorhomes

 > Thoughts on Deltran Battery Tender 5-10-15 watt solar units

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41woodie

Oklahoma

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Posted: 08/18/12 08:28am Link  |  Print  |  Notify Moderator

Just looked over the Deltran website trying to select a unit to charge the house batteries on our Born Free and saw that they are now offering solar powered units in 5-10-15 watt sizes. They also sell a small controller for use on other solar panels that is compatible with their chargers.
From the very little I know about solar units I would think that the Deltran units would be small for the job but would appreciate any thoughts or if anyone owns one of these how would you rate them. thanks mh


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pianotuna

Regina, SK, Canada

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Posted: 08/18/12 08:30am Link  |  Print  |  Notify Moderator

Hi,

I find that 12.5 watts per 100 amp-hours is the bare minimum needed for maintenance charging only.

It is probably best to "roll your own" with an inexpensive controller and 50 to 135 watt panel.


Regards, Don
Full Time in a Kustom Koach Class C 28'5", 256 watts Unisolar, 875 amp hours in two battery banks 12 volt batteries, Magnum 3000 watt PSW inverter.

2oldman

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Posted: 08/18/12 09:53am Link  |  Print  |  Notify Moderator

Depends on what you mean by "charge". Trickle, overnight, 4 hours?

garym114

Bluff Dale, Texas

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Posted: 08/18/12 09:53am Link  |  Print  |  Notify Moderator

15 watts is not enough. You would be disappointed.


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41woodie

Oklahoma

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Posted: 08/18/12 10:53am Link  |  Print  |  Notify Moderator

That's what I thought, the units are probably fine for keeping a stored unit's batteries fully charged but not big enough to recharge units in use while dry camping. thanks

jauguston

Bellingham, WA

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Posted: 08/18/12 11:22am Link  |  Print  |  Notify Moderator

15w would not be enough for even a stored unit unless the batteries were physically disconnected. There are enough "phantom loads" on most RV electrical systems that will drain the batteries over time even with a 15w solar panel.

Jim


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