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Forum Index : Solar : Suitable regulator for thin film array

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adonis
Regular Member

Joined: 13/02/2010
Location: Sweden
Posts: 42
Posted: 08:45am 05 Jul 2013
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Hello.
I´m trying to get a system with a thin film panel (50V*1A) and a nimh-battery that should be charged with around 15V to work.
I wish to find a quite simple regulator, but now we are using a quite advanced mppt-regulator that can handle up to 60V. Unfortunally it seems to "missunderstand" the panels, I have 14V and 0,5A in from the panels in full sunlight (should be 50V*2A since I even have 2 panels in parallell).
It might also be that the regulator "thinks" that the battery is fully charged, the voltage on that side was at the same time around 13,3V.

I might try to buid one using a DC/DC converter with floating input voltage (18-75V) and fixed output at 15V, but I´m not sure it will not have similar problems.

Anyhow, I would very much appriciate suggestions and ideas from you guys with vast experience!
 
davef
Guru

Joined: 14/05/2006
Location: New Zealand
Posts: 499
Posted: 09:35am 06 Jul 2013
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What is the open circuit voltage of each panel in full sunlight?
What is the short circuit current of each panel in full sunlight?
 
adonis
Regular Member

Joined: 13/02/2010
Location: Sweden
Posts: 42
Posted: 09:01pm 07 Jul 2013
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I guess you mean actual performance (measured by me) and not stated by the manufacturer?
Its not possible for me to acces the panels for quite some time, but I might be able to have someone else measuring them.
Do you think the fault might be in the panels?
If I arrange a trip to the site to take some measurements, what kind of factors might be interresting?
Should i also check the current when "short circuited" via a power resistor, for example 100 ohm, and different voltages at different loads, or would that not be of any use?
I might get a hold of a set to play around with at my summer cottage, then I will have plenty of time to investigate the system.
At the time I dont have much information regarding the panels, most of what I know is in the first message. And that they are a-Si.
 
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