I'm in the process of upgrading my 24 volt equipment. I have (9) 20v nominal 255watt panels on the roof currently wired in parallel going to a 80A PWM. I have purchased a MidNite Solar classic 150 controller and plan on wiring my panels 3x3.. A friend is going to help me with the panels and he is gone for 3 weeks. The question until he returns would it benefit me at all to go ahead and hook up the new controller?? Or should I wait until I have my panels reconfigured. Thanks
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Originally posted by douglasjett View PostI'm in the process of upgrading my 24 volt equipment. I have (9) 20v nominal 255watt panels on the roof currently wired in parallel going to a 80A PWM.
MSEE, PE -
Originally posted by douglasjett View PostI know... I know.... It didn't work, the batteries failed.. That is why I got a new controller. So, will the MN controller get more watts down to run my appliances during the day? Or should I just wait until I can get the panels reconfigured... Thanks
OutBack FP1 w/ CS6P-250P http://bit.ly/1Sg5VNHComment
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Originally posted by douglasjett View PostI know... I know.... It didn't work, the batteries failed..
MSEE, PEComment
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I know SunKing..... I didn't do it, it was sold to me like this. I'm fixing it. 1st I now have a MPPT controller. Then I'm going to have the panels wired 3x3... Then I'm going to buy brand new batteries and put it together properly. I currently get about 55-60A to the controller @ 26 Volts or so... Call it 1500W. Will I get more than 1500W If I hooked up the MPPT while I'm waiting for a rewire? The question has nothing to do with charging a battery... I know it's a strange question but I could use a more daytime juice for the next 3 weeks. I'm stuck in the Mexico desert and its HOT!
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Originally posted by douglasjett View PostI know SunKing..... I didn't do it, it was sold to me like this. I'm fixing it. 1st I now have a MPPT controller. Then I'm going to have the panels wired 3x3... Then I'm going to buy brand new batteries and put it together properly. I currently get about 55-60A to the controller @ 26 Volts or so... Call it 1500W. Will I get more than 1500W If I hooked up the MPPT while I'm waiting for a rewire? The question has nothing to do with charging a battery... I know it's a strange question but I could use a more daytime juice for the next 3 weeks. I'm stuck in the Mexico desert and its HOT!
For a 12volt battery system - 1000 watts = 83 amps
for a 24 volt battery system - 2000 watts = 83 amps
So if you are getting about 60 amps out of 9 x 225 watt panels wired in parallel I say each panel has an Imp rating of 7 amps. Which is low for 225 watts because they would need to have a Vmp ~ 32volts (32v x 7a = 224watts). I think you may have a wiring issue.
So what are the specs of those 225 watt panels and that 80A pwm CC.Comment
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Originally posted by douglasjett View PostI know SunKing..... I didn't do it, it was sold to me like this. I'm fixing it. 1st I now have a MPPT controller. Then I'm going to have the panels wired 3x3... Then I'm going to buy brand new batteries and put it together properly. I currently get about 55-60A to the controller @ 26 Volts or so...
Vmp =
Voc =
Imp =
Isc =
Pmax =
With 9 panels you only have one configuration possibility of 3S3P. That is the very first thing you need to do and that should give you around 80 to 85 amps charge current.
Last edited by Sunking; 06-09-2018, 09:58 AM.MSEE, PEComment
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I'm back... The upgrade is done. I now have the above panels wired in 3 sets of 3 going to a MidNite 150 CC. Many of you pointed out that by using an the old PWM I was limiting my 2300 watts to around 1500. The problem... I don't seem to be getting any more juice. Currently at 11:10 MT I'm showing 73 volts// 1250 Watts / 48 Amps. Very close to what I would be getting wired in parallel with the old controller. What am I missing? The CC charge settings are at default; Help...Comment
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Many things affect your solar output. The only time you'll see anything near full output would be when it's very cold and clear and your panels are PERFECTLY oriented to the midday sun, AND your battery bank is more than 20 % discharged (80% DOD), having your charge controller in bulk charge mode. Once you are into absorb the batteries are gradually topping off and reducing the current flow till full and into float. Try running a high draw item like a portable heater at noon and see what your controller is passing then.2.2kw Suntech mono, Classic 200, NEW Trace SW4024Comment
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Originally posted by douglasjett View PostOK, I hit 1800 watts. I'm very happy with that! Thanks littleharbor
2.2kw Suntech mono, Classic 200, NEW Trace SW4024Comment
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