wiring Two 220w bit deal solar panels to one 500amp hour battery

Submitted: Monday, Feb 09, 2015 at 14:48
ThreadID: 111053 Views:2580 Replies:2 FollowUps:6
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O.K to any one reading my continual threads on this folding solar panel to battery bank issue I am sorry to bore you but apples aint apples,,or so they tell me.
On advice from those in the know it seems bit deal solar panels are the way to go regarding Vmp ? .So here is the question again and for the last time.Can I bypass both regulators on each 220w bit deal solar panel
connect each of them to this cable
Then connect the single end to a regulator located close to my battery bank.
and if all this is possible then what would be a recommended regulator to handle these 2 panels . A virtual carton of beer, bottle of wine or box of chocolates to anyone who can set me straight,, LOL Thanks Kirko
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Reply By: Racey - Monday, Feb 09, 2015 at 15:58

Monday, Feb 09, 2015 at 15:58
Kirko, The cable link didn't come through. However, I think I know the one you mean and the simple answer is YES join both sets of panels as you describe to a common MPPT controller near the battery. Something like this one MPPT controller Bit Deals don't appear to have the higher current models.

AnswerID: 545624

Follow Up By: Racey - Monday, Feb 09, 2015 at 16:11

Monday, Feb 09, 2015 at 16:11
Kirko, at the risk of confusing you, you could reconnect each panel to 24volt by connecting the 2 halves in series. This will halve the current into the controller. Read the controller specs carefully as they do have wattage limits when connected in this manner I.E. 24 volt panels into 12 volt battery. Another option MPPT controller


FollowupID: 833236

Follow Up By: oldtrack123 - Monday, Feb 09, 2015 at 16:42

Monday, Feb 09, 2015 at 16:42
Hi Kirko
As Jon has suggested connecting the similar panels in series has some advantages
[a] less voltage drop for the same sized cables
actual current is only that of one panel from the panels to the regulator
[b] you will get more output from the panels in overcast conditions
[c]They will be better able to give max possible output @either very HOT or very cold panel conditions
[c]Under the right conditions, you will harvest near the combined panels rated output
All of the above require a quality MPPT controller which must be able to handle the combined OC voltages of the panels
[if each panels OCV is 21 V then it must be able to handle a min. of 42V]

One of the disadvantages is shading of one panel can have a severe effect on output, unless Bypass diodes are fitted at each panel's terminals

FollowupID: 833237

Follow Up By: kirko - Monday, Feb 09, 2015 at 18:05

Monday, Feb 09, 2015 at 18:05
Thanks Jon,,
sorry my mistake ,, posted the same link twice,,hard to think with a 4 year old waffling in your ear constantly LOL.
here is a link to the Anderson cable again


As im a bit of an newbie to the solar/camping world I find your first reply most appealing as it is simplest .2 220w bit deals solar panels with their regulators bypassed running back to this regulator near the battery bank


Thanks again kirk

FollowupID: 833248

Follow Up By: kirko - Monday, Feb 09, 2015 at 22:08

Monday, Feb 09, 2015 at 22:08
Hello again Gentlemen,,
Got the little one off to bed and have had a chance to try and digest some of this information,, I am super excited about this regulator setup :
The fact that it is made in Germany and not china puts it streets ahead in my book.I would assume that being rated to 420w I should perhaps consider reducing my total combined panel wattage down by 20w or perhaps 30w to be on the safe side.
After a quick search of the bit deals store the next size down from the 220w panel appears to be 160w :
So combined with the other 220w panel this totals 380w which would put me nice and safe in regards to the regulator ?.
So once again my intention would be to bypass the panel regs and connect them both to this Anderson cable :
then run the single plugged end into the above mentioned regulator.
Have I finally seen the light ?.
Love to hear everyones thoughts, especially yours Jon and PeterQ
FollowupID: 833265

Reply By: ModSquad - Monday, Feb 09, 2015 at 18:13

Monday, Feb 09, 2015 at 18:13

mate please keep all further questions on the matter to the one post. This question should have been asked in your original post 111040 on the topic that you posted yesterday.

It saves duplication and keeps all the relevant information in the one spot for you.

Thanks for your understanding

The squad.
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AnswerID: 545631

Follow Up By: kirko - Monday, Feb 09, 2015 at 19:26

Monday, Feb 09, 2015 at 19:26
Sorry Modsquad,,

Will keep it tidy from now on.

regards Kirko
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Follow Up By: ModSquad - Monday, Feb 09, 2015 at 20:14

Monday, Feb 09, 2015 at 20:14
Cheers Kirko.

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