Most Popular Topics
Collapse
New Solar Set Up
Collapse
X
-
-
Comment
-
Sorry for the hand writting but its a diagram of my system design. Advice is welcomed before I proceed to install in the comming weeksAttached FilesComment
-
How cold does it get where you are ? I'm concerned that the Voc, on a cold morning, at sunrise, will exceed the 150V limit of the controller.
You will only have 16A of charging @ 48V, and at 54V only 14A. (best case). 230ah battery needs 23A charge current to keep flooded cells stirred up and de-stratified. If you pull very much out of the bank, it may take several days to fully recharge
You are calling out 1/O welding cable. The standard Coarse Stranded lugs won't fit Fine Strand cable. Welding 1/O lugs are seldom tin plated for long life, and DIY crimp for 1/O requires hydraulic crimpers
I don't see any mention of grounding, either lighting or safety.Powerfab top of pole PV mount (2) | Listeroid 6/1 w/st5 gen head | XW6048 inverter/chgr | Iota 48V/15A charger | Morningstar 60A MPPT | 48V, 800A NiFe Battery (in series)| 15, Evergreen 205w "12V" PV array on pole | Midnight ePanel | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor (1/2hp 240V 1ph ) on a timer for 3 hr noontime run - Runs off PV ||
|| Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
|| VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A
solar: http://tinyurl.com/LMR-Solar
gen: http://tinyurl.com/LMR-ListerComment
-
CS6P-260P/SE3000 - http://tiny.cc/ed5ozxComment
-
Sir
I am from India where generally voltage from grid is 200V but in my area in winters it drops to 120V. I have recently installed grid tie solar inverter of 2KW which does not function because of low voltage.The requirement for the inverter to run is 180V. Can anybody help me to solve this problem?Comment
-
How cold does it get where you are ? I'm concerned that the Voc, on a cold morning, at sunrise, will exceed the 150V limit of the controller.
You will only have 16A of charging @ 48V, and at 54V only 14A. (best case). 230ah battery needs 23A charge current to keep flooded cells stirred up and de-stratified. If you pull very much out of the bank, it may take several days to fully recharge
You are calling out 1/O welding cable. The standard Coarse Stranded lugs won't fit Fine Strand cable. Welding 1/O lugs are seldom tin plated for long life, and DIY crimp for 1/O requires hydraulic crimpers
I don't see any mention of grounding, either lighting or safety.
What type of cable do you recommend for batteries and from batteries to inverter?
Everything will be grounded with 10 or 12 AWG run to a rod
Anything else you suggest?Last edited by Emorales; 01-07-2018, 10:37 AM.Comment
-
Where are you ? That's pretty warm for a minimum (record low) sunrise temp.Comment
-
Comment
-
Comment
-
650 watts @ 12 volts
1300 watts @ 24 volts
2600 watts @ 48 volt
3S3P is 9 panels.Last edited by Sunking; 01-07-2018, 08:53 PM.MSEE, PEComment
-
What voltage is the battery? With a 50 amp controller and 1560 watts of panels, the only correct answer is 48 volts and only configuration with your 6 panels is 3S2P. With a 50 amp controller maximum panel wattage it can accept with respect to battery voltage without limiting power is: You cannot do 12 or 24 volts with your controller. It is possible to do 24 volts but essentially you are throwing a panel away trying to do so and possible damage to the controller.
650 watts @ 12 volts
1300 watts @ 24 volts
2600 watts @ 48 volt
3S3P is 9 panels.Comment
-
3S
3S2P
3S3PLast edited by Sunking; 01-07-2018, 09:39 PM.MSEE, PEComment
-
With your panels on a 48 volt battery only gives you one option of 3 panels in series with a 150 Voc input controller. 2 is not a high enough voltage, and 4 is to much. With a 50 amp controller and 48 volt battery your maximum power Input is around 2600 watts. You only have one option for growth at 48 volts. You must use 3 more of the same panels in series up to 3S3P. You are married to 3 panels in series in a Catholic family, so no divorce is allowed.
3S
3S2P
3S3PComment
-
- Panels to Controller wire is fairly small. One of the advantages of a MPPT Controller and wiring your panels in series is to allow you to use smaller gauge wire like 14, 12, or 10 AWG.
- Controller to Battery wire is a short run where voltage drop is not normally an issue which allows you to use NEC minimum size conductor. Example for 50 Amp controller 6 AWG should work.
- Battery to Load (Inverter) wire is again dictated by length and amount of current required for the Inverter. 1/0 or what you are calling 0 AWG is likely much larger than you need. With a 230 AH battery I cannot foresee anything larger than 6 AWG. It depends on the length and current requirements. Example a 48 volt 2000 watt Inverter requires around 50 amps at full power. Assuming you keep the distance to 5-feet one-way 6 AWG is more than adequate.
With low voltages, you want to control voltage drop to minimize wire power losses. You want to keep loses to 2 or 3% between each component. If held to 3% would mean roughly 8 to 9% total wire losses at full power. So two conditions must be met. One is a performance (voltage/power loss), and second is safety (NEC). With very short runs calculations of 3% or less can lead to wire that is too small to meet safety requirements.
This is where wire calculators come in handy as they take both consideration into account. Here is a good Calculator you can use. Just keep this in mind, do not use anything smaller than the calculator suggest. No problem going larger.
1. To use the calculator first select the percentage of 2 or 3 %. I used 3% in the example
2. Be careful with Panel Voltage and do not confuse it with Battery Voltage. Example you would use the total Panel Vmp voltage. Just guessing with 3 of your panels in series should be around 90 volts. Just add all three panels Vmp up.
3. Enter the current. Example a single string of your panels enter the Imp value which is likely about 9 amps. Round up.
4. Use the 1-way distance, so lets use 20 feet as an example.
If you did it correctly you should get 12 AWG. If you get an odd number like 11 or 13 move up to gauge larger larger because not many supply vendors stock odd number wire. For the Controller to Battery, and Battery to Inverter use the battery nominal voltage of 48 volts.
Although the drawing below may not match your actual numbers, the drawing is the correct way to wire everything up. Your wire and fuse size will likely be different. Ignore the Battery Isolator as the drawing is for an RV.
Last edited by Sunking; 01-08-2018, 02:28 PM.MSEE, PEComment
Comment