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24V Panel, 12V Batts - Which Solar Charger?


Mark Flint

Question

Mark Flint

My battery bank is 12v but the panels I want are 24v. I'm looking for charge controller that can use these panels and charge my 12v system.

 

The panels are 24v - max point volt, 33; max open circuit, 46; max amp out, 4; max total power 136w

 

I want to option of using 4 of these panels for 500w array.

 

Any suggestions would be appreciated.

 

Thank,

Mark

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18 answers to this question

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Mark Flint

I've found a couple of charge controllers that look promising and not expensive, although I'm not sure they sell directly in the UK:

 

I've cant post links yet, but if you google "morningstar tristar ts mppt 30" or "morningstar sunsaver mppt" you will find them. The first is a 30amp and the second a 15amp, although they also do higher amparage such as 60a units which would be way too big for my boat needs.

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Mark Flint

Yes indeed it is

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binky

Wire panels in series, ampage will be less than 8 amps unless you buy exotic panels at horrendous prices. Check Ioc - that's the short circuit current flow of the panels you buy.

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Mark Flint

I could charge the batteries in series I guess, but I want an even discharge across the batteries. If they were in series how could I evenly draw off power at 12v without discharging one battery before another? Sorry if I ask stupid question, I don't have electrical training.

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Richard-the-ninth

Perhaps it would be better if you were to say exactly what it is you are trying to do / run, and why is it you want these 24v panels?

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Andy™

surely getting 12v panels to match the 12v system would make more sense...

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Mark Flint

I will be running the 12v electrics on my yacht.

 

I want these panels because they are long and thin (18 foot x 15.5 inches) and flexible - so are perfect for running down the length of my boat.

 

The panels really are the only 'non-negotiable' item (google Uni-Solar-PVL 136 if you are interested) so I suppose I could possibly run a 24v system on the boat but would prefer 12v. 

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Sidewinder

There are thousands of 24 to 12 V droppers out there just use one to suit your needs?

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Mark Flint

So do you mean use a 24v battery and putting a dropper in after battery? Are they fairly efficient?

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Sidewinder

Dropper after the battery or between batteries and panels.

Efficiency you would need to look into yourself and satisfy your own requirements.

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Mark Flint

OK Sidewinder, I can see that might be the solution. Cheers.

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binky

surely getting 12v panels to match the 12v system would make more sense...

you don't generally get 12v panels

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Richard-the-ninth

Ah, a yacht. Would solar panels really be what you want, or just what you think would be right? I can't help but wonder how good they would be after getting wet on a regular basis. Have you not considered a 12v wind turbine, works when there is no sunshine / light and doesn't need to face any particular direction.

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NozSpark

Most yachts now use both solar and wind to charge their batteries.... unless they motor.....

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binky

according to a boat sparky I once met, solar works better than the wind turbines, especially if sailing further South, like the Med

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Mark Flint

Canoeboy - many thanks for the link, looks good.

Yep, I'm thinking solar first, but also considering a wind turbine as well.

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