linking flexible solar panels

Submitted: Thursday, Oct 30, 2014 at 19:24
ThreadID: 109991 Views:1883 Replies:3 FollowUps:0
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We had planned to purchase 2 x 100 watt Sunpower flexible solar panels and 2 x 50 watt Solbian flexible solar panels to fit on the roof of our Toyota coaster. We are wondering if it's possible to link them all to one MPPT charge controller or will we need two controllers because they are different. The 100 watt puts out 5.55 amps/ 17 volts and the 50 watt puts out 5.51 amps / 9.2 volts.

Cheers, peasuep
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Reply By: Gronk - Thursday, Oct 30, 2014 at 20:29

Thursday, Oct 30, 2014 at 20:29
Got no idea why the 50W panel is rated at only 9 V, but if you haven't bought the panels yet, why not get some that have the same or similar specs ??

Do you need flexible panels to go on a roof ??

Save a lot of money if you go for rigid panels..
AnswerID: 541087

Reply By: The Bantam - Thursday, Oct 30, 2014 at 22:19

Thursday, Oct 30, 2014 at 22:19
There are real issues concering hooking up dissimilar pannels.

Can I ask why you are consideting two different brands of pannel and not all the same brand and model.

Even if the pannels are different sizes but the same brand and should have little problems hooking them all up in paralell.

mixing and matching is not advised as it can effect efficiency.

Maximum Power Point Tracking regulators do exactly that...the whole point is by black magic and switchmode electronics....present the optimum load to the pannel/s and the optimum output to the batterie/s.

If the characteristics of the mixed pannels do not match up....the reg cant find the optimum load for either panel.

all that said...if the pannels are close it may not effect the efficency too much at all.....but its a lottery.

AnswerID: 541097

Reply By: peasuep - Saturday, Nov 01, 2014 at 08:12

Saturday, Nov 01, 2014 at 08:12
Thanks Gronk and Bantam,
We have chosen the flexible panels for their low profile and minimal attachment points ie little or no drill holes that seem to go with the frames needed for the solid panels. We ended up with two different brands because of the shapes. The two 100 watt panels fit nicely on the roof space above the cab and the 50 watts are long and skinny to fit down the centre of the bus where the profile is flat. :)
AnswerID: 541161

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