Do more watts balance out MPPT controller. (1 Viewer)

Mar 26, 2012
68
55
Belfast
Funster No
20,284
MH
A class
Exp
Since 2014
I'm in Northern Ireland so some companies aren't keen on sending here because of carriage costs. I can buy a 260 watt kit locally with an ordinary 60 amp charge controller with it and all the cables etc. For similar money I can get a 200 watt kit from England with an MPPT controller. My question is simple, would the extra 60 watts compensate for the charging capabilities lost by not having an MPPT controller?
Already have a 100 watt panel on and 2x110 amp batteries and this new system will be wired up separately to have two independent set ups.
Thanks for anybodies input.
 

Lenny HB

LIFE MEMBER
Oct 18, 2007
54,178
153,060
On the coast in West Sussex
Funster No
658
MH
Hymer B678 DL
Exp
Since 2008 & many years tugging
The MPPT has the biggest gain when the weather is dull and the sun at a low angle you get a gain of around 25%.
Yes the extra 60 watts should go some way to compensate.
Why not buy the panels in NI and the controller for the UK as if sent by Royal mail postal charges are the same as for the mainland.
 
OP
OP
BryanM
Mar 26, 2012
68
55
Belfast
Funster No
20,284
MH
A class
Exp
Since 2014
The MPPT has the biggest gain when the weather is dull and the sun at a low angle you get a gain of around 25%.
Yes the extra 60 watts should go some way to compensate.
Why not buy the panels in NI and the controller for the UK as if sent by Royal mail postal charges are the same as for the mainland.
Thanks for that. I think I’ll go for the MPPT one as we are looking at changing the van in a couple of years for something smaller and the idea would be I could change the solar onto the new van. The kit I can get locally is just one big panel and while it will just fit on my roof, I’m not sure it would transfer to anything smaller. The other kit is made up of two panels so is a bit more versatile.
 
Dec 2, 2019
3,659
7,907
Amersham
Funster No
67,145
MH
van conversion
Exp
Since 2019
What’s the data on the 260w panel?
The PWM controllers are amps in amps out at battery voltage. For example if the 260w panel is 30v 8,6A, the controller will be able to charge max at 8,6a x 14,4v 123,84w.
The mppt is power in= power out to the battery,

Your 200w choice looks better.
 
OP
OP
BryanM
Mar 26, 2012
68
55
Belfast
Funster No
20,284
MH
A class
Exp
Since 2014
What’s the data on the 260w panel?
The PWM controllers are amps in amps out at battery voltage. For example if the 260w panel is 30v 8,6A, the controller will be able to charge max at 8,6a x 14,4v 123,84w.
The mppt is power in= power out to the battery,

Your 200w choice looks better.
Yes think the 200w will work out better. The panel size of the 260 is 1000x1700 so not easily transferred.

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Dec 2, 2019
3,659
7,907
Amersham
Funster No
67,145
MH
van conversion
Exp
Since 2019
Yes think the 200w will work out better. The panel size of the 260 is 1000x1700 so not easily transferred.
Right, if it’s dimensions are as you say, then possibly a 60cell panel, and my figures are pretty much as suspected.
 

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