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Post by Ryan on Nov 19, 2019 9:27:56 GMT
Hi there
I’m pretty new to solar but I’ve j stalled a rover40 and 2 x 250 watt panels.
I’ve noticed (at least I think I have) that when plugged into ac power (or when hopping off ac power directly) that the solar panels sit very low in there walls. They don’t go above 75w. However when the batteries ha even off ac for a day or so the panels are back at around 200w. Is the moot controller limited the input current into the unit?
It’s not something I would of expected to see. Are there any thresholds in the solar input and are these adjustable?
I assumed I had some dodgy panels not working effectively and now I’d also like to understand and rule out the panels.
Thanks
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Post by tattoo on Nov 19, 2019 13:09:25 GMT
The rover only uses what it needs from the panels to change the batteries.........What kind of batteries and how many do you have?
What kind of load do you have on your system?
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Post by bupkis on Nov 19, 2019 13:35:55 GMT
Yes, the controllers job is to prevent overcharging of the battery.
Typically at the start of the day all power goes to the battery until its voltage rises to 14.4v
Once 14.4v @ the batt the controller limits power to the batt to maintain 14.4v
Usually a 2 hr limit of holding 14.4v, during this time it takes less and less power to maintain 14.4v as the batt gets full.
Once the 2 hrs is up the controller then tries to keep the batt @ float voltage 13.?v. Again it limits power since not much is needed as the batt is full.
Using battery power can cause the batt voltage to drop and the cycle starts over.
The first stage of charging is call BULK and you should be able to see that on the right side of the LCD screen. Power is limited during BOOST (constant voltage 14.4v) and FLOAT (constant 13.?v).
The set pts are in the controller manual along with how to adjust some parameters. Other parameters might be adjustable with the BT dongle and app.
I don't own that controller.
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raydas
Solar Devotee
Posts: 166
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Post by raydas on Nov 19, 2019 15:10:22 GMT
Just for clarity, for the charging states, my Solar Station Monitor (SSM) program looks like this:
Idle - Less than 12.0V from solar panel(s)
MPPT - > 12.0 solar panel(s)
BST - Boost ??
Float - 13.?V
Idle - Less than 12.0V from solar panel(s)
The term Bulk has been used, but I have not seen this in my SSM data set. Is bulk = MPPT, and if so, is it officially over when it transitions too either BST, Float, or Idle or ??.
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Post by Ryan on Nov 20, 2019 0:10:12 GMT
The rover only uses what it needs from the panels to change the batteries.........What kind of batteries and how many do you have? What kind of load do you have on your system? I have 2x120ah lithium’s in parallel And the panels are nasty little solarised 250w x2. I’m going to add a 300w panel to get more juice into them as right now it maxes at 200w per day in amazing weather. |
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Post by tattoo on Nov 20, 2019 1:52:12 GMT
The rover only uses what it needs from the panels to change the batteries.........What kind of batteries and how many do you have? What kind of load do you have on your system? I have 2x120ah lithium’s in parallel And the panels are nasty little solarised 250w x2. I’m going to add a 300w panel to get more juice into them as right now it maxes at 200w per day in amazing weather. That answers part of my question here's the other...... What do you have hooked up to your solar system using power? |
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Post by Ryan on Nov 20, 2019 2:07:17 GMT
I have 2x120ah lithium’s in parallel And the panels are nasty little solarised 250w x2. I’m going to add a 300w panel to get more juice into them as right now it maxes at 200w per day in amazing weather. That answers part of my question here's the other...... What do you have hooked up to your solar system using power? Well it’s a 24ft caravan which is lived in full time. So there is 2 kids 2 adults, a 200lt 12v fridge and ancillary stuff (lights etc). |
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Post by tattoo on Nov 20, 2019 3:29:38 GMT
Well it’s a 24ft caravan which is lived in full time. So there is 2 kids 2 adults, a 200lt 12v fridge and ancillary stuff (lights etc). It sounds like your doing very well............ That's a lot of power your using..... |
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Post by Ryan on Nov 20, 2019 5:59:10 GMT
My question now really is
How do I know the panels are producing poorly and not the rover40 limiting them?
Especially with regards to lithium which my understanding is seen as 100% full 90% of the time as there is no voltage drop?.
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Post by bupkis on Nov 20, 2019 11:56:59 GMT
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Post by tattoo on Nov 20, 2019 13:53:38 GMT
My question now really is How do I know the panels are producing poorly and not the rover40 limiting them? Especially with regards to lithium which my understanding is seen as 100% full 90% of the time as there is no voltage drop?. I don't think you have said.....
What is your voltage in your batteries at 8AM and what are they at 12 and 5pm?
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Post by Admin on Nov 20, 2019 20:02:01 GMT
some posts have been moderated.
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Post by tattoo on Nov 20, 2019 20:55:41 GMT
some posts have been moderated. Thank you............... |
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