Solar Regulator for 120W array.

Submitted: Saturday, May 25, 2013 at 17:52
ThreadID: 102406 Views:1502 Replies:4 FollowUps:1
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I have two 60W panels (120W array) but no regulator is fitted. Recently ran a multimeter across my secondary battery (dual battery system) with 16+ volts recorded. I concerned this will eventually 'fry' the battery. Can I fit an after market solar regulator to my panel array.
If so can anyone please advise size and make. I will be thankful for any advice.
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Reply By: Ross M - Saturday, May 25, 2013 at 18:04

Saturday, May 25, 2013 at 18:04
If you have the two panels without a regulator then you definitely require one as the panels will fry the batteries as you thought.
In theory your panels indicate a 10amp flow of amps, however you will never get that much and a 10amp regulator mounted as close to the batteries as possible would do the job ok.
If you ever need/require to increase the panel wattage then a 20 amp reg may be in order and not much dearer anyway.

Ross M
AnswerID: 511812

Follow Up By: roscoriver - Saturday, May 25, 2013 at 21:36

Saturday, May 25, 2013 at 21:36
RKc47, I can't help you but you will get a lot of good advice here. Hope the trip is going well. Stay safe. R & S F
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FollowupID: 790121

Reply By: Member - Bruce C (NSW) - Saturday, May 25, 2013 at 20:06

Saturday, May 25, 2013 at 20:06
Hi rkc47,

Here is a link to a solar controller on ebay. It is a PWM unit with a 30 amp capacity which will more than do your job and accommodate any future upgrade so long as you do not exceed the 30 amp input limit.

PWM 30amp solar regulator

Understand that MPPT is the best but these PWM regulators are pretty good none the less. It is also the same as the unit in my van.

If I find a suitable MPPT I will put it into a follow up.

Cheers, Bruce
At home and at ease on a track that I know not and
restless and lost on a track that I know. HL.

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AnswerID: 511817

Reply By: Matthew G3 - Saturday, May 25, 2013 at 21:50

Saturday, May 25, 2013 at 21:50
rkc47
I just bought a Morningstar 15A MPPT reg at a really good price $289 to the door. they are a top brand designed in USA. I bought it from Apolloenergy in Melbourne but they have an office in WA. They were about $100 cheaper than anybody else, even buying it from the STATES.

Best of luck Matt
AnswerID: 511822

Reply By: KenInPerth - Sunday, May 26, 2013 at 10:22

Sunday, May 26, 2013 at 10:22
Hi rkc47

I have just been reading this post re PWM vs MPPT and thought it may be of interest to you - some good robust discussion that may be worth while given you are looking to buy a controller.

MPPT vs PWM

AnswerID: 511842

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