I have 6 100w solar panels wired for 24v. My battery pack is 8 fortune 100a 24v. automatic transfer switch , two tracer bn- 40 amp solar controllers and a pure sine wave 3000w inverter- charger 24v to 110v. My first question is which device should I use to charge the battery pack? My second question is what battery settings should I set. Thanks in advance for your help to a first time solar builder.
Need help with new solar system
- Thread starter bat6mm
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MisterSandals
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One of the tracer bn-40's? They are charge controllers, right?
LiFePO4, 24v.
MisterSandals
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Also note that your MPPT will likely be much more efficient operating at a much higher voltage than 24v.
Depending on the Voc of your panels, it may be best to have all 6 of your panels in series (need to stay below 150v). Otherwise your best bet will be 3 panels in series and then the 2 strings in parallel (for around 60Vc ?).
Depending on the Voc of your panels, it may be best to have all 6 of your panels in series (need to stay below 150v). Otherwise your best bet will be 3 panels in series and then the 2 strings in parallel (for around 60Vc ?).
MisterSandals
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And why do you have 2 SCC's? Do you have a specific plan to use both?
MisterSandals
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Always good to think ahead!
So then why are you using tiny solar panels? Are you constrained on where you can put them?
How do you have your 6 panels connected to 1 SCC now or 2 SCC?
Series? Parallel? or both?
Where do you have those 6 panels mounted? RV? or?
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MisterSandals
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MisterSandals
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MPPT's are optimized for high voltage (but always! below max input).
And there needs to be some "headroom" of the input voltage above the battery voltage (sorry i don't know the inner details). So bringing in ~24v to charge a 24v battery is suboptimal - at some point it won't even start up if too close to battery voltage.
2 strings of 3 in series is a good solution for your 6 panels.
MisterSandals
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With 8x 100ah LiFePO4 (nice big bank!) it will take a lot to fill them.
100ah x 8 x 24v = 19,000wh!
With 5 hours of charging, that would take 3,800w of solar panels to recharge completely.
3800w / 24v /5h = 31.6A <--- pretty well sized for 2x 40A chargers.
But 38x 100w panels? Yow.
If I understand you on that 20 amps ac output.
The Output on the 40A 150V PV Input Epever Tracer 4215BN LOAD TERMINALS is 20A DC
There is no AC out of a SCC.
You get AC out of an inverter.
The LOAD TERMINALS are going to the light bulb in pic below.
Output is probably 24 volts at 20A but I am not sure about that?
The SCC would only output on the load terminal when the sun is shining.
Your Battery is for emergency power to critical items 24 hrs a day.
MPPT Solar Charge Controller 40A 150V PV Input Epever Tracer 4215BN Negative Ground 12V 24V 1050W Solar Panel Charing Regulator
Brand: ZHCFeatures: 2nd Generation MPPT Solar Charge Controller 40 Amp for 12V/24V DC Input, Negative Grounding Design, Buy a ZHC WiFi-Box, Control the Controller by Phone Device Ultra-High Capacity: Exclusive MPPT Charging Technology, High tracking efficiency > 99.5% ,Peak Conversion Rate > 98%...
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MisterSandals
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I think he means 8 x 3.2V Fortune 100A cells = 25.6V battery at 100AH = 2400 watts.
MisterSandals
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