MPPT controllers

I have had a Plasmatronics PL20 controller that has served me very well as part of the solar system on my off-road motorhome. Does anyone know whether I would get greater efficiency replacing it with a MPPT controller, and if so, approximately how much? It is a 24 volt system.
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Reply By: V8 Troopie - Wednesday, Mar 28, 2012 at 00:43

Wednesday, Mar 28, 2012 at 00:43
I have two large solar panels on a tracker on the shed roof (24V system)
I do monitor the current from the panels into the MPPT (MPPT60-1 by GSL) and also the current going to my large battery bank.
If the Amps from the panels peg on 10A the battery bank charging current is 13A.That ratio is fairly consistent while the batteries accept full charge.
My experience of MPPT with panels optimally facing the sun.
AnswerID: 481570

Reply By: Member - Boobook - Wednesday, Mar 28, 2012 at 06:09

Wednesday, Mar 28, 2012 at 06:09
PhilD, yes you will get better efficiency which you will experience as additional current.

The additional efficiency is 5 - 30% and usually more like 15 - 25%

You will get the highest additional power when
-It is cool and the panel voltage is high.
-When the battery is lower. ( say below about 12.5V)
-The regulator is in bulk charge.

This all adds up to the mornings, and you will see 25 - 30% more charge current than you do with your current charger. And mornings are the best time to get as much charge as possible after they discharge overnight.

AnswerID: 481573

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