What improvement will a MPPT charger provide in my system

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What improvement will a MPPT charger provide in my system

Postby guymadison on Wed Apr 19, 2017 12:01 pm

Currently I have a 240 Watt solar panel with a PWM charge controller and a 800 ah 12v battery bank, I see charge rates of about 6 amps on the sunniest of days will I get better performance with a SCCM10-100? Ideally if it's not connected to the 12v battery rail it should benefit but I am not sure I understand if the SCCM10-100 isolates the battery from the solar panels which produce most of their power at 30 V.
guymadison
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Joined: Tue Apr 18, 2017 4:43 pm
My RE system: Solar World 235 Watt panel / PWM controller / 12v 800 ah battery bank

Re: What improvement will a MPPT charger provide in my syste

Postby hendrik krijt on Mon Apr 24, 2017 2:57 am

mppt.jpg
Hi

Currently you have 6A coming to your battery at 12 volts, that gives you about 70Watts, A mppt charge controller will draw power from your panel at its max powerpoint of 30volts. Depending on the amount of sunshine and the temperature and the angle of incidence of the sun onto the panels and atmospheric conditions, you may see upto the 240watts going to the batteries. you might see upto 20 Amps into your batteries. I will try to post a photo of what my mppt charger is currently doing. 70v at 6.3A coming from panels, 29.5v at 14A. that 441watts coming from panels, 413watts going to batteries. thecharge controller uses some power, but you will win big time.

Lots of South African Southern sunshine to you all!
Hendrik Krijt
hendrik krijt
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Joined: Sat Dec 31, 2016 6:33 am
Location: South Africa, KZN province
My RE system: pv=4.9Kw, 2xflexmax 80, 2x 24v-240v 50Hz outback inverters, fla's 12x Willard rt25 tubular 2v cells. rsa, kzn prov. (may change to aquion batteries)

Re: What improvement will a MPPT charger provide in my syste

Postby billi on Mon Apr 24, 2017 7:36 am

Please provide the specs of your PV panel , hard to believe for me that a 240 watt panel is ideal for 12 volt charging without an Mppt charger
billi
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Joined: Tue Oct 23, 2007 12:25 pm
Location: ireland
My RE system: 4000 watt PV array , Outback MX 60 and FM80 charge controller ,24 volt 1600 AH Battery @ C5 ,6 Kw Victron inverter charger, 1000 watt windturbine AC-coupled , 1.1 kw high head hydro turbine as a back up generator

Re: What improvement will a MPPT charger provide in my syste

Postby guymadison on Mon Apr 24, 2017 11:42 am

Oh I knew it wasn't ideal, but based on the sun we get here in Seattle it's been quite impressive. On a bright sunny day I did some experiments under load with an adjustable switching power supply and I found I was able to get about 8-10 amps as I drove the max current / voltage up to the peak output of 30V for the panel.. since I already had a PWM controller it just didn't seem worth the extra cost to install a MPPT controller which is pretty much a switching power supply on using the inductance of a toroidal coil to isolate the voltage between the batter and the panel.

It's a big panel at 240 Watts with a peak output of 8 amps at 30 volts, the curve is pretty static until it hits that point and drops off like most panels.

But Hendrik is getting good results, I ordered a OB MPPT controller just to see if there is a noticeable difference.

I will probably add another 240 Watt panel on the back of my sailboat which will give me plenty of power for long anchorages.
guymadison
Junior Member
 
Posts: 2
Joined: Tue Apr 18, 2017 4:43 pm
My RE system: Solar World 235 Watt panel / PWM controller / 12v 800 ah battery bank


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