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 > Want to add solar battery charger for storage use

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RickLight

Washington

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Posted: 05/22/20 08:46pm Link  |  Quote  |  Print  |  Notify Moderator

Last winter I used a 5W panel for 300AH of lead acid. It also powered 2 ultrasonic rodent deterrents. We aren't a major winter sun zone.

You don't need to spend mega bucks!


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Dan Diego

So Cal

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Posted: 07/01/20 11:53am Link  |  Quote  |  Print  |  Notify Moderator

Thank you all for the advice. I am not yet committed to the full solar roof option. I was just looking for something to keep the batteries from running down in a period of inactivity.
I opted for a cheap fix. $30 7 watt solar panel from harbor freight. $33 Battery Tender solar regulator. $10 extension cable. When in storage, I put the 14x14 solar panel in the window with the most sun exposure and have it cabled directly to the battery. So far, so good. I will have better feedback when in storage for a period longer than a month.


Cheers!
Dan

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pianotuna

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Posted: 07/01/20 12:13pm Link  |  Quote  |  Print  |  Notify Moderator

Dan Diego wrote:

Thank you all for the advice. I am not yet committed to the full solar roof option. I was just looking for something to keep the batteries from running down in a period of inactivity.
I opted for a cheap fix. $30 7 watt solar panel from harbor freight. $33 Battery Tender solar regulator. $10 extension cable. When in storage, I put the 14x14 solar panel in the window with the most sun exposure and have it cabled directly to the battery. So far, so good. I will have better feedback when in storage for a period longer than a month.


Return them. Fully charge the battery bank. Disconnect the ground cable. Why waste your money?


Regards, Don
My ride is a 28 foot Class C, 256 watts solar, 556 amp hours of AGM in two battery banks 12 volt batteries, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

Dan Diego

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Posted: 07/01/20 01:41pm Link  |  Quote  |  Print  |  Notify Moderator

I do not disagree with your post. My situation is that I do not have access to electrical at my storage yard. I also do not have the ability to keep my trailer in my driveway over night without running afoul of my HOA. The effort to pull my batteries, charge them for a day, then return them to the trailer is significant with recent shoulder problems. For me, this seemed worth the risk.

dedmiston

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Posted: 07/01/20 05:31pm Link  |  Quote  |  Print  |  Notify Moderator

jdc1 wrote:

Yep...go big, as dedmiston says. 100-200watts will keep you happy when you're out there in Glamis or Borrego.


We put in 700 watts of panels. You can see the sun get dim when it comes over our roof. I think we even get a little charge from the full moon.


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nayther

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Posted: 07/02/20 04:54pm Link  |  Quote  |  Print  |  Notify Moderator

Dan Diego wrote:

I do not disagree with your post. My situation is that I do not have access to electrical at my storage yard. I also do not have the ability to keep my trailer in my driveway over night without running afoul of my HOA. The effort to pull my batteries, charge them for a day, then return them to the trailer is significant with recent shoulder problems. For me, this seemed worth the risk.


I would not go to all that trouble. batteries should be fully charged after camping by pulling it home. Once parked in storage with 90% plus SOC disconnect the positive lead and walk away, reconnect when you return. You'll have batteries in nearly the same SOC as when you parked it. BIL has a battery for his boat (standard lead acid group 24 Marine) that is 10+ years old. He disconnects when he parks it and all is good.

Why do you want to keep 12v connected in storage? Just curious


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Dirtclods

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Posted: 07/05/20 06:49pm Link  |  Quote  |  Print  |  Notify Moderator

Just keep an eye on your battery levels.

Dan Diego

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Posted: 07/05/20 07:42pm Link  |  Quote  |  Print  |  Notify Moderator

Quote:

Why do you want to keep 12v connected in storage? Just curious


I have and use a battery disconnect switch on my trailer when in storage.

Due to health issues, I was unable to perform any maintenance on my trailer for seven months, last year. In that time, the batteries had run down significantly. That is why I felt compelled to take some action. The easiest thing for me to do was the small solar panel. I will see soon enough if it was a good decision or not.

I am encouraged that you get great life out of the battery by charging before storing and disconnecting cable. Thanks for your advice.

Rockinfigs

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Posted: 07/06/20 09:36am Link  |  Quote  |  Print  |  Notify Moderator

yeah i would go big also...I have two 12v lithium batteries connected to 420watt solars...love it especially the lithium batts.


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nayther

Burbank, CA

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Posted: 07/06/20 10:56am Link  |  Quote  |  Print  |  Notify Moderator

Dan Diego wrote:

Quote:

Why do you want to keep 12v connected in storage? Just curious


I have and use a battery disconnect switch on my trailer when in storage.

Due to health issues, I was unable to perform any maintenance on my trailer for seven months, last year. In that time, the batteries had run down significantly. That is why I felt compelled to take some action. The easiest thing for me to do was the small solar panel. I will see soon enough if it was a good decision or not.

I am encouraged that you get great life out of the battery by charging before storing and disconnecting cable. Thanks for your advice.


if there is significant drain with the disconnect open then you must have something connected "ahead" of the disconnect, perhaps the breakaway switch or tongue jack? Try disconnecting the ground wire AT the battery.

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