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Conecting solar panels
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Written on: 03 July 2010 [03:10]
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kadidennis
Topic creator
registered since: 27.01.2010
Posts: 6
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I tried putting solar panels on my Kandi Coco, it has 6 12 volt (72 volts) battery's, I installed 3 solar panels, 15 watts per panel, I ran the solar panel wires directly to 4 of the batterys,any way only the 4 batterys seem to be charging, and the other 2 are not charging,My question is where do I connect the 3 positive and 3 neutral wires to on the battery pack? thanks so much Dennis |
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Written on: 03 July 2010 [13:19]
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iamian
 
registered since: 23.02.2009
Posts: 110
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If you have 6 batteries at 12V each and are using 12V solar panels. You have two options. #1> Get 6 solar panels so you have 1 panel for each battery. #2> Get a DC-DC converter that will allow you to step up the voltage you are getting from your solar array ( all panels combined ) so that it is enough to charge all 6 batteries connected together in series. - - - - - - Either option you will want some type of charge control ... either a dedicated battery charge controller ... or for some ( but not all ) batteries you can trickle charge them if the solar array is sized to charge slow enough. - - - - - - - more specific details can be given if you have more specific details about the specific batteries being used and the specific solar panels being used. RE & Efficiency enthusiast
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Written on: 14 July 2010 [23:15]
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kadidennis
Topic creator
registered since: 27.01.2010
Posts: 6
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iamian wrote: thanks Iamian--My batterys are Trojan,plumbous acid,deep cycle, 12V , 6 of them,= 72volts, I have 3 solar panels, each is 15 walt, 45 walt total, Thank you so much for your advice, as I know nothing about this, I just checked on E-Bay for DC-DC converters and their is many but I don't know which to buy, sorry about not responding to you sooner but I have been recovering from Cancer surgery--thanks again--Dennis
If you have 6 batteries at 12V each and are using 12V solar panels. You have two options. #1> Get 6 solar panels so you have 1 panel for each battery. #2> Get a DC-DC converter that will allow you to step up the voltage you are getting from your solar array ( all panels combined ) so that it is enough to charge all 6 batteries connected together in series. - - - - - - Either option you will want some type of charge control ... either a dedicated battery charge controller ... or for some ( but not all ) batteries you can trickle charge them if the solar array is sized to charge slow enough. - - - - - - - more specific details can be given if you have more specific details about the specific batteries being used and the specific solar panels being used. |
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Written on: 14 July 2010 [23:59]
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kadidennis
Topic creator
registered since: 27.01.2010
Posts: 6
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Thanks Iamian--Sorry for not responding sooner but I have been recovering from Cancer Surgery, I'am OK now, My car has 6 12 volt Trojan plumbous acid,deep cycle batterys, 72 volts total, I have 3 solar panels, 15 watt each panel,14.5 volts output (working), peak voltage 23.57 OCV (open circuit volts) I just checke3d on E-Bay for DC-DC converters and they have many but I don't know what to buy, as you can tell I really am a beginner at this and I really appreciate you advice--thanks so much--Dennis |
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Written on: 08 December 2010 [20:19]
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KajolThappar
registered since: 27.09.2010
Posts: 1
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I assume you are talking about a system in which multiple solar cells are connected in parallel and you are worried that the shaded cells are bleeding current from the unshaded cells? I don't think solar cells would do that. Anyway, a diode will have a 0.5 to 0.7 Volt drop across it (when forward biased), so if the output of your cells is low (less than 2V, your diode will really cut down on the voltage to your motor). If you cells are banked to produce higher voltage, then maybe you can afford to lose the 0.5V. |
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