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 > Solar trickle charger fail!

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ajriding

st clair

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Posted: 05/06/20 09:28am Link  |  Quote  |  Print  |  Notify Moderator

Is this a question or just random statement?

If not going through a controller then 1st question is, is there a diode? * If no diode then the current will go from the battery back into the solar panel at night and discharge the battery, maybe as much as it charged it during the day. Diodes are cheap and just a small one from Radioshak will suffice and yo can wire it yourself with little help from internet searches.

If no controller then you are putting the full 18-20 volts into the 12 volt battery that is normally charged around 14 volts. For 10 watts this is fine as it is such a small amt of current, but for more wattage you need to drop that voltage down to the 12-14.X volts that is safer for the batt.

I used to trickle two 12v marine batts with a 15 watt panel going directly into the batts. It worked fine for years. It was just barely enough to keep the batts topped off, but really could not do charging. It was the full 18 volts. I think I put a diode on at some point too.

* A diode is a little thing that allows current to only go one direction. The direction will be from panel to battery, not the other way (batt to panel). It is about the size of a big grain of rice and has wires on either end. Usually gray color and always with a black stripe on one end.

dedmiston

So Cal

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Posted: 05/06/20 09:52am Link  |  Quote  |  Print  |  Notify Moderator

ajriding wrote:

* A diode is a little thing that allows current to only go one direction. The direction will be from panel to battery, not the other way (batt to panel). It is about the size of a big grain of rice and has wires on either end. Usually gray color and always with a black stripe on one end.


Years ago we were camping in a huge group and a buddy set up a windmill to power his rig as a goof. It was huge and pretty dangerous, so we gave him plenty of room. He was fussing with it the whole time because it was drawing power from the batteries instead of feeding them. I didn't get involved with his problem, but it seemed to me like something was wired backwards.

We never let him live it down. [emoticon]


2014 RAM 3500 Diesel 4x4 Dually long bed. AISIN trans & 4.10 rear. B&W RVK3600 hitch • 2015 Crossroads Elevation Homestead Toy Hauler ("The Taj Mahauler") • Hooligan #3

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bpounds

Sophmore Brain...

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Posted: 05/06/20 10:17am Link  |  Quote  |  Print  |  Notify Moderator

I can't imagine any solar trickle charger would come without a diode. They would be getting returns faster than they shipped new ones. I suppose a few people would just toss it and call it a day, but word would get around pretty fast.

Good info, and might have been an issue in the past.


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ajriding

st clair

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Posted: 05/06/20 02:49pm Link  |  Quote  |  Print  |  Notify Moderator

dedmiston wrote:

Years ago we were camping in a huge group and a buddy set up a windmill to power his rig as a goof. It was huge and pretty dangerous, so we gave him plenty of room. He was fussing with it the whole time because it was drawing power from the batteries instead of feeding them. I didn't get involved with his problem, but it seemed to me like something was wired backwards.

We never let him live it down. [emoticon]


He made a giant fan !

dedmiston

So Cal

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Posted: 05/06/20 03:22pm Link  |  Quote  |  Print  |  Notify Moderator

ajriding wrote:

He made a giant fan !

LOL. Exactly. [emoticon]

Yosemite Sam1

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Posted: 05/18/20 12:25pm Link  |  Quote  |  Print  |  Notify Moderator

Again thank you everyone for the outstanding inputs -- specially for David on off-line.

Here is the post-mortem:

1. Batteries remain good and was able to restore to full charge.

2. Bought a battery switch and would turn it off on storage. Got blocks and too many wire that it's inconvenient to remove the covers.

3. Yes, there is just a slight drop in voltage when the switch is turned off on storage.

4. With the new solar trickle charger, battery is topped-off constantly. In fact, when there is zero use in the RV, it's not even necessary to connect the 100W solar panel.

And hopefully other newbies and even veterans can learn from this as much as I've learned from you.

Appreciate it folks and I'll be a happy camper.

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