Recent content by sunshine_eggo

  1. sunshine_eggo

    Solar panel setup opinions/advice wanted…

    I didn't open the back to confirm, but they behaved as though they did: Voltage: Shade each zone, and I got a reduction in voltage Current: Shade each zone, no change in current until the final zone was shaded
  2. sunshine_eggo

    Mixing LiFePo4 and AGM

    Yes - mostly. Only if left paralleled with no charging for a very long period of time. Generally, no. Since LFP has a higher WORKING voltage, it will provide the bulk of its capacity before the AGM start contributing meaningfully. When sitting, the AGM will pull a small current from the...
  3. sunshine_eggo

    24V Lifepo4 discharged to 18V - How badly am I screwed?

    Likely not screwed. The BMS DID protect. It probably has a setting somewhere around 2.3V. Not great for them, but far worse has been done for far longer. Just charge it back up. You might need to get an alternate charger on it if the Growatt won't activate at such a low battery voltage.
  4. sunshine_eggo

    Solar panel setup opinions/advice wanted…

    Been away for a bit. @bradbill and @rmaddy had me questioning my understanding to the point that I've been in my back yard with 2X Renogy 100W panels, a voltmeter, an ammeter and a shade. @bradbill is right. I was wrong about how a single panel going to zero would affect the other series...
  5. sunshine_eggo

    Need several industrial FLA batts. How to find best deal?

    Quality well maintained FLA will always outlast quality AGM.
  6. sunshine_eggo

    Top Balance PATIENCE Question.

    FWIW, most LFP cells are fully charged at 3.65V and 0.05C, i.e., on a 280Ah cell, it's fully charged at 3.65V and 14A. When cells are in parallel, the convention is to run it to near zero to ensure all cells are truly full. The fluctuations were as the individual cells hit full. They stopped...
  7. sunshine_eggo

    Victron Multiplus 24/2000 shutting off at beginning of charge-cycle

    27.4 is 3.425V/cell. 3.4V/cell is regarded as the max safe float voltage; however, for the purposes of what you're doing and the expected duration, it probably doesn't mater.
  8. sunshine_eggo

    Need several industrial FLA batts. How to find best deal?

    No such thing unless you're getting them from the manufacturer. All of those efforts produce dramatically substandard batteries that are a poor value, i.e., you get more bang for your buck with new. Check out Crown's 921 offerings. Crown tends to be near the bottom of the $/kWh barrel while...
  9. sunshine_eggo

    Victron Multiplus 24/2000 shutting off at beginning of charge-cycle

    Yep. I vigorously disagree with Big Battery. Their information is contrary to cell manufacturer specs when specified.
  10. sunshine_eggo

    Solar panel setup opinions/advice wanted…

    You're both right. It depends on the partial shading. If the shading is only over a zone covered by one or more diode, but it still allows the operational portion of the panel to continue to put out the same current as the rest, then the impact on the remaining panels in the string will be...
  11. sunshine_eggo

    Victron Multiplus 24/2000 shutting off at beginning of charge-cycle

    Their statements are conditionally true, but they lack explanation. 27.2 is 3.4V/cell. You can get them charged to about 95% at this level, but you will have a notably long absorption period. 27.6 is 3.45V/cell, and it will get you to 98%+ a little faster than when charging to 27.2V (3.4)...
  12. sunshine_eggo

    MPP PIP-1012LV-MS MPPT output too small?

    PVWatts doesn't always show an improvement. One would have to run the two scenarios, download the hourly data and then dig in to find two a day where there was clearly no weather effects and then compare the two. I've never gone to that level with that in mind. The method on solarpaneltilt...
  13. sunshine_eggo

    Solar panel setup opinions/advice wanted…

    I think that's just inconsistent wording common in English manuals for Chinese products. @Bud Martin made the point nicely.
  14. sunshine_eggo

    LiFePo4 battery capacity is questionable

    I second this, but I'm Victron's bitch. They have so much of my money. :)
  15. sunshine_eggo

    Solar panel setup opinions/advice wanted…

    520W is the maximum it can deliver. It doesn't mean you can't put more on it. Overpaneling by 20-30% is generally acceptable to most manufacturers provided you don't exceed PV input limits,e.g., for a 100V/40A controller, series Voc can't exceed 100V (should have head room for cold weather...
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