talob
New Member
Posts: 4 
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Post by talob on Sept 10, 2017 0:13:23 GMT
Hello, new here just found the new site, the question I have is on wiring my panels, I want to set up a 24v system, the panels I have are four Sharp 250W voc is 37.35 short circuit current is 9.03 should I go series parallel would be about 73v 18a sound right? Or just go parallel 37v at 36a is that right? Anyway what would be the best way to go? Thanks
Mike
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Post by tytower on Sept 11, 2017 9:15:45 GMT
So a panel is going to give you say 9 amps at 30 V maybe. put 4 of them them in series and you have 120V 9 amps or put them in parallel and you have 30Volts 36 amps. That's my understanding anyway.
2 in Series and 2 of those strings in parallel would give 60V at 9 amps in each leg so 60V at 18 amps for the 4.
P= E x I
Power (watts) = E(Volts) x I(Current)
4 x 250 watt panels = 1000watts total so 1000W/60V =17 Amps approx.
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talob
New Member
Posts: 4
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Post by talob on Sept 11, 2017 12:10:15 GMT
Thanks for the reply tytower, sooo what would be the advantage of series parallel over parallel? (other than a smaller charge controller).
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Post by tytower on Sept 11, 2017 21:48:55 GMT
Depends entirely on what you want to do. What voltage are you going to work with ?
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talob
New Member
Posts: 4
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Post by talob on Sept 13, 2017 21:29:14 GMT
OK, try this again didn't work yesterday, anyway the system will be 24v the panels are about 37v, panels are probably less than 20' from batteries.
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Post by dennis4611 on Sept 26, 2017 1:37:25 GMT
You will need a 40amp 24volt solar controller (google it for products).
Your 37Vlt panels should be connected in parallel to the controller.
The controller will feed the 24VDC battery, you can use a single 24VDC battery, or two twelve volt batteries in series.
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talob
New Member
Posts: 4
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Post by talob on Sept 29, 2017 0:26:57 GMT
Thanks for the reply dennis4611, the controller I have is a MPPT 40amp 150v, I'm looking at eight 6v gulf cart batteries @225 amp hrs wired for 24v, so best way to go is leave voltage at about 37 and push amp's to about 36? Can you tell me the advantage of this over a series parallel on the panels (that's the way I was leaning). Thanks
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Johann
Junior Member
Posts: 56
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Post by Johann on Apr 29, 2018 1:29:42 GMT
Thanks for the reply dennis4611, the controller I have is a MPPT 40amp 150v, I'm looking at eight 6v gulf cart batteries @225 amp hrs wired for 24v, so best way to go is leave voltage at about 37 and push amp's to about 36? Can you tell me the advantage of this over a series parallel on the panels (that's the way I was leaning). Thanks If you run higher voltages with the same wattage, then your amps will drop. Lower amps will mean smaller wires or longer wire runs. Your controller has a amp limit at 40 amps. at 37 volts and 36 amps = 1,332 watts, which would be pretty much max that controller can handle with that voltage. If we double the voltage with the same amperage, the same controller could handle 2 times the wattage now which will come in handy if you want to expand the system in the future. Or if we double the voltage with those 1,332 watts the amps could be 1/2 now, which again could help you if you want to expand later on, in this case the wires can be smaller also. |
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