rob
Solar Newcomer
Posts: 5
|
Post by rob on Sept 28, 2018 3:42:54 GMT
What charge controller would you suggest I purchase to support the following requirements? Should I purchase more than the 6 panels needed to meet these needs? I'm thinking a 1000W inverter should be more than enough. I probably could use a 750W though. I'm planning on using 12 6v 215AH batteries in three 24v banks. Would you install the panels in series or parallel? Please provide a system diagram. Thanks Equipment WATTS Hours WATT-HOURS Number Of Panels TV 25.47 18.00 458.46 WATT-HOURS / Peak Solar Hours = WATTS 1313.87 Monitor 12.00 6.00 72.00 WATTS / Controller Efficiency = WATTS 1459.86 Computer 25.00 13.00 325.00 WATTS / Inverter Efficiency = Final WATTS 1622.06 Computer Speakers 0.91 24.00 21.84 Server 68.98 12.00 827.76 Panel WATTS 300.00 Direct TV Receiver 15.49 24.00 371.76 Security Cameras 5-8 5.52 24.00 132.48 Panels Needed 5.41 (6 panels) Security Cameras 1-4 5.52 24.00 132.48 Security Recorder 16.00 24.00 384.00 Raspberry Pi 2.36 24.00 56.64 Battery Amp-Hours Needed Switch 1.74 24.00 41.76 Router 12.20 24.00 292.80 WATT-HOURS * 2 11824.84 DirectTV Deca Broadband 4.87 24.00 116.88 Battery bank voltage 24.00 Cable Modem 8.34 24.00 200.16 Fan 135.55 18.00 2439.90 Amp-Hours Needed 492.70 Lamp 5.50 7.00 38.50 Total 345.45 5912.42 Peak Solar Hours 4.50 Controller Efficiency .90 Inverter Efficiency .90
|
|
|
Post by tattoo on Sept 28, 2018 12:15:30 GMT
I say you will need at least 12 panels... With that many batteries...
|
|
|
Post by Admin on Sept 30, 2018 2:52:21 GMT
What charge controller would you suggest I purchase to support the following requirements? Should I purchase more than the 6 panels needed to meet these needs? I'm thinking a 1000W inverter should be more than enough. I probably could use a 750W though. I'm planning on using 12 6v 215AH batteries in three 24v banks. Would you install the panels in series or parallel? Please provide a system diagram. Thanks Equipment WATTS Hours WATT-HOURS Number Of Panels TV 25.47 18.00 458.46 WATT-HOURS / Peak Solar Hours = WATTS 1313.87 Monitor 12.00 6.00 72.00 WATTS / Controller Efficiency = WATTS 1459.86 Computer 25.00 13.00 325.00 WATTS / Inverter Efficiency = Final WATTS 1622.06 Computer Speakers 0.91 24.00 21.84 Server 68.98 12.00 827.76 Panel WATTS 300.00 Direct TV Receiver 15.49 24.00 371.76 Security Cameras 5-8 5.52 24.00 132.48 Panels Needed 5.41 (6 panels) Security Cameras 1-4 5.52 24.00 132.48 Security Recorder 16.00 24.00 384.00 Raspberry Pi 2.36 24.00 56.64 Battery Amp-Hours Needed Switch 1.74 24.00 41.76 Router 12.20 24.00 292.80 WATT-HOURS * 2 11824.84 DirectTV Deca Broadband 4.87 24.00 116.88 Battery bank voltage 24.00 Cable Modem 8.34 24.00 200.16 Fan 135.55 18.00 2439.90 Amp-Hours Needed 492.70 Lamp 5.50 7.00 38.50 Total 345.45 5912.42 Peak Solar Hours 4.50 Controller Efficiency .90 Inverter Efficiency .90 --Edit-- Check recommendation in later post. -Renogy Team
|
|
|
Post by bupkis on Sept 30, 2018 12:05:05 GMT
Hi rob, you should get admin to explain the 'oversized' comment.
With 645ah of battery, I'd want 80A of panels that would be able to deliver 65A of charge current in average-good conditions. 2000watts / 24v = 83A x .8 = 66.7A 2000/300 = 6+ panels, fixed panels in the winter will not collect enough power for your use.
if the 300w '24v' panels are 60 cell you'd want to series pairs
when you start connecting in series you'll need a controller that can handle to higher voltage.
|
|
rob
Solar Newcomer
Posts: 5
|
Post by rob on Sept 30, 2018 18:22:44 GMT
Thank you, everyone, for your responses. So I should start out with two 24v battery banks at 215 ah each. Bupkis indicated that I would need more panels. If I use two strings of 4 x 300-watt panels would a commander 60A MPPT work and would this be enough panels?
|
|
|
Post by bupkis on Sept 30, 2018 18:46:24 GMT
You need at least 500ah and thinck 430ah is enough??? MAKE admin justify their claim.
I believe that CC can only handle series of 3 before exceeding voltage input limit, you need to find the panel specs and do the math, see page 10 of that manual. Also check page 11 on how that controller can be overpowered. See also specs 27.
a couple or more strings of 2 or 3 panels!
bupkis suggests one charge source that can deliver 10% of capacity, as one can easily see if the battery is @ 50% it takes 5+hrs of FULL sun to FULLY recharge!!! example 100ah discharged to 50ah needs 50+ah to recharge, @10% or 10A that's 5+ hrs of full sun, there ain't that much sun in most places!!! only 4.8 where you are at and at one time of year!!! what about winter spring and fall.
|
|
|
Post by tattoo on Sept 30, 2018 19:46:55 GMT
Thank you, everyone, for your responses. So I should start out with two 24v battery banks at 215 ah each. If I use two strings of 4 x 300-watt panels would a commander 60A MPPT work and would this be enough panels? I say you will need more panels with all that your hoping to run from what you said in your first post... Now what you said above that would be a really good start...
24v is also the best way to go as it's closer to 120v.... I think you could also add one more battery bank with that many panels...
|
|
|
Post by Admin on Sept 30, 2018 23:48:35 GMT
Thank you, everyone, for your responses. So I should start out with two 24v battery banks at 215 ah each. Bupkis indicated that I would need more panels. If I use two strings of 4 x 300-watt panels would a commander 60A MPPT work and would this be enough panels? Hi Rob, We apologize for the confusion. We made an error in reading your system requirements. For starters, what is your general area location? We misread you were going to utilize 600W (6 x 100W) panels as opposed to 6 x 300W panels with minimal usage throughout the day. The battery is appropriately sized as well as the panel suggestion in your chart. With that said, 4 x 300W panels is not enough to support your load usage and its relationship to battery consumption. You will need at least an 1800W system so you actually need 6 x 300W panels to support your loads and battery bank. Your minimum battery bank (assuming 50% depth of discharge) is 500Ah. You choosing to use 645Ah is "oversized" in the sense that your panels are not sized to adequately charge it back up in a day from 50% if you drain your batteries of 645Ah to 50%. There are other factors to consider such as not having sun everyday, more than normal load usage, seasons, and other conditions that are out of your control by which can lead you to consuming more than 50% of your your oversized battery by which the panels can not charge it back up in a day. This is why other members, such as bupkis, suggested you actually need even more panels than 6 x 300W. With that said, it seems as though you might need room for expansion. If you wanted, you can start off with 6 x 300W panels and connect them in series parallel. At the moment we do not have a Renogy controller that can handle more than 1800W on a 24V system (at least for standard system sizing), and therefore would recommend the Midnite 150/200A Controller which is sold on our website as well. -Renogy Team
|
|
|
Post by Admin on Sept 30, 2018 23:50:58 GMT
You need at least 500ah and thinck 430ah is enough??? MAKE admin justify their claim. I believe that CC can only handle series of 3 before exceeding voltage input limit, you need to find the panel specs and do the math, see page 10 of that manual. Also check page 11 on how that controller can be overpowered. See also specs 27. a couple or more strings of 2 or 3 panels! bupkis suggests one charge source that can deliver 10% of capacity, as one can easily see if the battery is @ 50% it takes 5+hrs of FULL sun to FULLY recharge!!! example 100ah discharged to 50ah needs 50+ah to recharge, @10% or 10A that's 5+ hrs of full sun, there ain't that much sun in most places!!! only 4.8 where you are at and at one time of year!!! what about winter spring and fall. Thank you for bringing the error to light. -Renogy Team
|
|
|
Post by tattoo on Oct 1, 2018 0:14:45 GMT
Hi Rob, We apologize for the confusion. We made an error in reading your system requirements. For starters, what is your general area location? We misread you were going to utilize 600W (6 x 100W) panels as opposed to 6 x 300W panels with minimal usage throughout the day. The battery is appropriately sized as well as the panel suggestion in your chart. That's the way I read it also..... 6 100w panels...
He never said what type panels he was talking about.... Just that he was thinking 6 of them.... Now it's two strings of 4 300w panels....
|
|
|
Post by bupkis on Oct 1, 2018 1:33:03 GMT
rob, you clearly showed you wanted/needed 1622 watts of panels and 300w panels resulting in 5.41 (6) panels. how did you determine peak sun hrs? is this tilted at optimal tilt at various times of year? I came from it a different way, I'll guess it will take ~80A x 24v or 1920watts of panel to deliver 65A of battery charge. That is a 80% derating of panel performance, Renogy does not supply the NOTC panel rating, read about NOTC below www.pveducation.org/pvcdrom/modules/nominal-operating-cell-temperaturefurther derating may be called for based on snow, tilt angle, season, forest fire smoke, saudi dust, ... Days of autonomy!
|
|
|
Post by tattoo on Oct 1, 2018 1:50:48 GMT
rob, you clearly showed you wanted/needed 1622 watts of panels and 300w panels resulting in 5.41 (6) panels. I didn't see that until I click quote on the OPs first post.... Then the numbers on the right show up that your talking about.... Why I don't know?
I bet it didn't show up on the Admin page either...
|
|
|
Post by Admin on Oct 1, 2018 1:52:49 GMT
rob, you clearly showed you wanted/needed 1622 watts of panels and 300w panels resulting in 5.41 (6) panels. how did you determine peak sun hrs? is this tilted at optimal tilt at various times of year? I came from it a different way, I'll guess it will take ~80A x 24v or 1920watts of panel to deliver 65A of battery charge. That is a 80% derating of panel performance, Renogy does not supply the NOTC panel rating, read about NOTC below www.pveducation.org/pvcdrom/modules/nominal-operating-cell-temperaturefurther derating may be called for based on snow, tilt angle, season, forest fire smoke, saudi dust, ... Days of autonomy! www.renogy.com/template/files/Specifications/RNG-300D_spec.pdfNOCT: 47±2ºC -Renogy Team
|
|
rob
Solar Newcomer
Posts: 5
|
Post by rob on Oct 1, 2018 2:48:34 GMT
Thank you, everyone, for your responses. So I should start out with two 24v battery banks at 215 ah each. Bupkis indicated that I would need more panels. If I use two strings of 4 x 300-watt panels would a commander 60A MPPT work and would this be enough panels? Hi Rob, We apologize for the confusion. We made an error in reading your system requirements. For starters, what is your general area location? We misread you were going to utilize 600W (6 x 100W) panels as opposed to 6 x 300W panels with minimal usage throughout the day. The battery is appropriately sized as well as the panel suggestion in your chart. With that said, 4 x 300W panels is not enough to support your load usage and its relationship to battery consumption. You will need at least an 1800W system so you actually need 6 x 300W panels to support your loads and battery bank. Your minimum battery bank (assuming 50% depth of discharge) is 500Ah. You choosing to use 645Ah is "oversized" in the sense that your panels are not sized to adequately charge it back up in a day from 50% if you drain your batteries of 645Ah to 50%. There are other factors to consider such as not having sun everyday, more than normal load usage, seasons, and other conditions that are out of your control by which can lead you to consuming more than 50% of your your oversized battery by which the panels can not charge it back up in a day. This is why other members, such as bupkis, suggested you actually need even more panels than 6 x 300W. With that said, it seems as though you might need room for expansion. If you wanted, you can start off with 6 x 300W panels and connect them in series parallel. At the moment we do not have a Renogy controller that can handle more than 1800W on a 24V system (at least for standard system sizing), and therefore would recommend the Midnite 150/200A Controller which is sold on our website as well. -Renogy Team Wow, that is a lot of information. My general location is just about dead in the middle of Texas. I was asking earlier about 8 X 300W panels connected series/parallel with the Commander 60A MPPT but if I'm understanding things correctly the Commander is only able to use 6 300W panels connected series/parallel at 24V (1800W max). How many 300W panels would you suggest considering the Midnite 150/200A Controller, 24V 645AH battery bank, and the needs from the original post? A lot of this equipment will be running 24/7. I was hoping to find a solution that would charge the batteries and still provide enough power to run the equipment during the day and use the batteries at night.
|
|
|
Post by bupkis on Oct 1, 2018 3:08:17 GMT
I see that would be a 10% reduction in Pmax based on temp (-.47% X (47.2-25)), now if you apply the 80% sun am I correct that Pmax NOCT would be ~70% of STC Pmax? Others not only report NOCT as a temperature but Isc, Vmp, Voc, Pmp at NOCT conditions!! Rob, the 150v input limit, limits you to 3 panels in series!
|
|