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Old 10-23-2018, 02:33 AM   #1
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Default Not charging

I have 2 100 watt solar panels wired in parallel wired into a Solarepiv 40a mppt charge controler. Its charging 2 12volt 100ah sealed lead acid batteries wired in parrallel. I'm getting less than 1 amp at peak sun. I think i should be seeing more. Can you help?
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Old 10-23-2018, 03:07 AM   #2
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How low is the battery state of charge? If they are full, you won't charge much at all. What battery type is the controller set to?
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Old 10-23-2018, 02:09 PM   #3
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Booster's two points:
1. batteries already charged
2. wrong profile selected

are excellent. I'll add that paralleled panels (assuming standard panels for 12V system) and an MPPT controller are not the best combo. An inexpensive PWM controller would do as well or nearly as well at a much reduced cost. MPPT controllers work best with higher input voltage. Is there a reason why the panels were installed in parallel and not in series?
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Old 10-23-2018, 02:34 PM   #4
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A quick look says that an external remote is needed for any settings, so that could make monitoring difficult for monitoring also if not used.


My first choice for MPPT is also series as long as partial shading isn't an issue.
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Old 10-23-2018, 04:57 PM   #5
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Can I wire the solar panels in series even though I have a 12 V system?


[
QUOTE=markopolo;82870]Booster's two points:
1. batteries already charged
2. wrong profile selected

are excellent. I'll add that paralleled panels (assuming standard panels for 12V system) and an MPPT controller are not the best combo. An inexpensive PWM controller would do as well or nearly as well at a much reduced cost. MPPT controllers work best with higher input voltage. Is there a reason why the panels were installed in parallel and not in series?[/QUOTE]
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Old 10-23-2018, 05:44 PM   #6
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Check the controller manual to be sure but a Google search for Solarepic 40a mppt charge controller turns up an MPPT controller rated for up to 150V DC input with automatic sensing a 12V or 24V battery.
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Old 10-24-2018, 05:28 PM   #7
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Quote:
Originally Posted by markopolo View Post
Booster's two points:
1. batteries already charged
2. wrong profile selected

are excellent. I'll add that paralleled panels (assuming standard panels for 12V system) and an MPPT controller are not the best combo. An inexpensive PWM controller would do as well or nearly as well at a much reduced cost. MPPT controllers work best with higher input voltage. Is there a reason why the panels were installed in parallel and not in series?
My research, when I built Annie, AND my subsequent experience, is that MPPT works better than PWM in low light/ low sun angle situations. It scavenges available energy better, simply because it impedance matches panel and load better. At 12V, or at 24V.

Also, wiring in parallel helps minimize panel dropout due to partial shading. All conditions we deal with here in the PNW.

We've have no problem with running our 4 panels in parallel into our MPPT.


But I'll agree with the original suggestions to check charge and profile.
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Old 10-24-2018, 08:01 PM   #8
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I've always figure folks who buy MPPT controllers would wire the panels in series because of the advantages of using higher voltage input.


From: https://www.victronenergy.com/upload...WM-or-MPPT.pdf

Quote:
Conclusion:
When using an MPPT charge controller there are two compelling reasons to
increase the PV voltage (by increasing the number of cells in series):
a) Harvest as much power as possible from the solar array, even at high cell temperature.
b) Decrease cable cross sectional area and therefore decrease cost.
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Old 10-24-2018, 09:17 PM   #9
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Quote:
Originally Posted by markopolo View Post
I've always figure folks who buy MPPT controllers would wire the panels in series because of the advantages of using higher voltage input.


From: https://www.victronenergy.com/upload...WM-or-MPPT.pdf
I figured that the improvement in partial shade behavior of a parallel setup outweighed any high temperature losses, especially since we live (and mostly travel) in a cooler climate with lots of shade and sub-optimal panel orientation.


(I^2)R losses are handled by appropriate gauge cable. On a custom van build, with short runs (much shorter that you would expect in a fixed home array), they are not excessive.


If this was a fixed home setup, with a known clear location, I would certainly go for a higher voltage setup.
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Old 10-29-2018, 05:50 PM   #10
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My charge controller is disconnecting power to all loads when the batteries read bellow 13.5. I,m assuming it,s because the settings aren't set correctly. Does anybody know the correct parameters (settings) for a setup like mine?
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