am i able to wire 4 panels in series. 300watt panels at 36.1 volts and 8.3 amps each so a 36.1 volts and 33.2 amps. Can i wire this into say a 10 or 20amp controller as this is all i need to charge my batteries is about 8 to 16 amps depending if i do 12v or 24v. will a charge controller step down the amps? or will i just fry a controller because its output amps are under the input amps?
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Originally posted by Shane.R13 View Postam i able to wire 4 panels in series. 300watt panels at 36.1 volts and 8.3 amps each so a 36.1 volts and 33.2 amps.
in parallel it would be 36.1V at 33.2a
You are going to want an MPPT CC which would likely required either all series or series /parallel.
Originally posted by Shane.R13 View PostCan i wire this into say a 10 or 20amp controller as this is all i need to charge my batteries is about 8 to 16 amps depending if i do 12v or 24v.
Originally posted by Shane.R13 View Postwill a charge controller step down the amps?
Originally posted by Shane.R13 View Postor will i just fry a controller because its output amps are under the input amps?
OutBack FP1 w/ CS6P250P http://bit.ly/1Sg5VNH 
4S would be 144.4 Vmp & 8.3 amps and likely close to 170V on a cold morning, ruining your 150V charge controller.
Going 2S2P would yield 72.2Vmp @ 16.6A and would likely stay under 100V on a cold morning. A MPPT controller will convert that to
24V @50A or 12V @ 100A, but few 100 A controllers exist, Classic 150 is good for 92 A, PT100 is good for 100A, but I don't know if it has a 12V rangePowerfab 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 SO59 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
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my issue is i have 4 panels and 2 small batteries (50 amp hours). i'd like to be able to charge them with all 4 panels until i can obtain larger amp hour batteries. so if my panels are out putting 33 amps and i only require 10 amps or so will a 10amp controller step 33 amps down without blowing it self up?Comment

Are you kidding?
If it is a PWM controller, you must wire the panels in parallel and when in parallel the Input current and output current is 32 amps at any battery voltage. 32 is greater than 10.
If the controller is MPPT makes no difference if the panels are in series parallel. The output current at full power depends on battery voltage. At 12 volts = 100 amps 24 volts = 50 amps. 100 and 50 are greater than 10
PWM Output Currrent = Input Current and should never be used.
MPPT Current = Panel Wattage / Battery Voltage.
The only way to limit the current is with panel wattage. I assume you have a MPPT controller or should. So if your batteries can only handle 10 amps is real easy to find the Panel Wattage.
Power = Volts x Current
12 volt battery x 10 amps = 120 watts
24 volt battery x 10 amps = 240 watts.
Guess what?
So what you can do is get a 10 amp PWM controller and use 1 panel to get 8 amps to your battery. That way you can throw 3 panels away, and if you use a 12 volt battery will turn your 300 watt panel into 8 amps x 12 volts = 96 watts. Got any problem with any of that? I don't
Problem solved.Last edited by Sunking; 04162018, 05:23 PM.MSEE, PEComment

Originally posted by Shane.R13 View Postmy issue is i have 4 panels and 2 small batteries (50 amp hours). i'd like to be able to charge them with all 4 panels until i can obtain larger amp hour batteries. so if my panels are out putting 33 amps and i only require 10 amps or so will a 10amp controller step 33 amps down without blowing it self up?
Your best bet is to NOT use all the PV modules till you have more ah.OutBack FP1 w/ CS6P250P http://bit.ly/1Sg5VNHComment

Originally posted by ButchDeal View Post
will some of the better MPPT charge controllers can limit the charging current BUT if you could afford one of those then you could afford more batteries.
Your best bet is to NOT use all the PV modules till you have more ah.Comment
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