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 > Solar Charge Controller question

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Twistedlarch

Cottage Grove, OR.

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Posted: 03/24/20 08:27pm Link  |  Quote  |  Print  |  Notify Moderator

Thanks all for your input/suggestions! I decided to go with the Grape Solar COMET 12/24-Volt 40 Amp Solar Charge Controller. I want to keep things simple and inexpensive. (2) 100 watt panels is all the space I have on my 17' roof, and should provide plenty of power to my little trailer.

Last Summer I ran just fine on the Harbor Freight 100 watt Thunderbolt system. Since then I've upgraded from dual group 23's to dual 6 volts, therefor needing to upgrade my solar setup.

I ran my heat and lights for about 18 hours bringing my batteries down to 81%. One 100 watt panel had them back up to 100% in just under 3 hrs with the most intense sun hitting it in the last hour.

Again, thanks for all your help! Now I just need to figure out the best way to mount them to my roof [emoticon]
Brian

babock

Los Angeles, CA

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Posted: 03/25/20 07:58pm Link  |  Quote  |  Print  |  Notify Moderator

Epever is probably ok but the Victrons are great. Definitely get an MPPT controller. Depending on the panel specs, you can get 20% to 30% more yield.

In the case of the OP's panels, he would get a 22% increase.

EDIT: Just saw you made your choice.

LtDanwy

Wyoming

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Posted: 04/03/20 12:23pm Link  |  Quote  |  Print  |  Notify Moderator

I have a Renogy Wanderer MPPT on my trailer and it has worked wonderfully with my system.

StirCrazy

Kamloops, BC, Canada

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Posted: 04/04/20 10:48am Link  |  Quote  |  Print  |  Notify Moderator

while PWM may be a cheeper unit, walk right buy it. in ideal conditions a PWM wont have much less output than a MPPT , but we dont camp in ideal conditions, we dont aim our pannels most of the time, we try to park under trees which will cast shadows over parts of your pannels, this is where a MPPT controler shines and makes a large difference in your output to your batteries. I have 480 watts of pannels on my 5th wheel and I am going to upgrade it to a MPPT controler. does the other one work, yup but I notice the differences a bit of shading can make on the output from one area to another. I am also putting a 355 watt system on my truck camper I just got. That is being set up with a MPPT right from the start. they may cost an extra 50 bucks but its worth it.

Steve


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babock

Los Angeles, CA

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Posted: 04/04/20 12:31pm Link  |  Quote  |  Print  |  Notify Moderator

StirCrazy wrote:

while PWM may be a cheeper unit, walk right buy it. in ideal conditions a PWM wont have much less output than a MPPTe
Totally disagree with that statement. If you have a 100W 20V panel @ 5A, you will get 5A under ideal conditions with a PWM and 7A with an MPPT. That'a huge difference.

allen8106

Burrton. KS

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Posted: 04/06/20 11:57am Link  |  Quote  |  Print  |  Notify Moderator

Look at a Bogart Engineering SC-2030 PWM charge controller. They run about $120 and are a simple reliable device. I also use a Morningstar TS-45 PWM controller. They are a little more and run around $175.


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pianotuna

Regina, SK, Canada

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Posted: 04/06/20 04:50pm Link  |  Quote  |  Print  |  Notify Moderator

babock,

It would be good to provide a link to back up statements.

I do prefer MPPT myself.


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.

beermanjoe

Pa

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Posted: 04/06/20 07:01pm Link  |  Quote  |  Print  |  Notify Moderator

On the solar topic. My new TT has a solar plug in. How do I use it? Thanks


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babock

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Posted: 04/07/20 12:26am Link  |  Quote  |  Print  |  Notify Moderator

pianotuna wrote:

babock,

It would be good to provide a link to back up statements.

I do prefer MPPT myself.
Back up statements? You mean the output of a PWM vs MPPT?

Which part do you not understand?

StirCrazy

Kamloops, BC, Canada

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Posted: 04/07/20 05:53am Link  |  Quote  |  Print  |  Notify Moderator

pianotuna wrote:

babock,

It would be good to provide a link to back up statements.

I do prefer MPPT myself.


in theory what he said is right, but in real world with both setups ideal I would probably expect a 1 amp difference.

Steve

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