At least 2 issues with my system

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Comments

  • gicamucigicamuci Registered Users Posts: 26 ✭✭
    BB. said:
    The single "cool string" is being hammered pretty well with your present usage and a second string is really needed (for loads/65% discharge overnight/high charging current).

    -Bill
    Thanks Bill.
    The 65% is the SOC in the morning. So overnight I am pulling 35% from them. I did set my inverter so overnight, if the SOC gets to 65%, will switch to the grid.
    I thought about charging the 2 bats together as a 12V one, but I decided to g with one at the time.
    Even with just one bat charging is taking a lot of time and the charger timed out this morning. I had to reset it. Still charging number 1 for now.
    5.1kW, 12 × 250W + 4 x 275W + 3 x 330W solar panels , FM80 MPPT CC, WavePower 6kW pure sine inverter, 16 x Trojan 105Plus in 8s2p strings 450Ah @ 48V battery bank.
    8Kw Champion LPG gen for emergencies only.
  • Dave AngeliniDave Angelini Solar Expert Posts: 5,553 ✭✭✭✭✭
    gicamuci said:
    The so called "hot" battery bank is now offline while I try and bring up the two batteries that were low on SG.
    Those around 50A are going to the online good string of batteries that have 225Ah @48V.

    gicamuci means "Gică" (a name, much like George in English) plus "muci" which means snotty (in English, mot-a-mot), but I am using is more as "novice". So something like "novice George". I was born, raised and lived in Romania until I turned 30. So that's a Romanian "thing" as my name is not George, but Alex.

    Thanks Alex!  Yea the comment on the 50A is really telling you 10% of the 225AH. You should be limiting charge current to 25 or 30 amps.
    A bit nicer in winter in the DR. Do you miss the seasons of R ?
    "we go where power lines don't" Sierra Mountains near Mariposa/Yosemite CA
     http://members.sti.net/offgridsolar/
    E-mail [email protected]

  • gicamucigicamuci Registered Users Posts: 26 ✭✭
    I made the change on the CC to limit to 30A, for tomorrow though. Today they are already on Floating.

    A bit nicer in winter in the DR. Do you miss the seasons of R ?
    Only the 4 seasons, yes. Then I moved to Canada where there were truly 2 seasons (summer and winter).
    Yes the winter is way nicer here in DR :)
    5.1kW, 12 × 250W + 4 x 275W + 3 x 330W solar panels , FM80 MPPT CC, WavePower 6kW pure sine inverter, 16 x Trojan 105Plus in 8s2p strings 450Ah @ 48V battery bank.
    8Kw Champion LPG gen for emergencies only.
  • gicamucigicamuci Registered Users Posts: 26 ✭✭
    So for tropical climate, what battery chemistry would be recommended ?
    Here in DR in "summer" months :) even at night the ambient temp won't go under 26C.
    5.1kW, 12 × 250W + 4 x 275W + 3 x 330W solar panels , FM80 MPPT CC, WavePower 6kW pure sine inverter, 16 x Trojan 105Plus in 8s2p strings 450Ah @ 48V battery bank.
    8Kw Champion LPG gen for emergencies only.
  • gicamucigicamuci Registered Users Posts: 26 ✭✭
    Overnight I switched on grid so today I started with a full or close to full string. They brieflly went to Bulk and then a bit of Absorbing followed by Floating for 5 minutes or so.
    All this so I am EQing the good string. Currently there are 29A @ 62V going into them. I know Trojan says 64.8V, but had to go lower because of the ambient temp.
    Is this rate of 29A @ 62V a good rate for this string of 6V bats in series with 225Ah capacity ?
    They are nicely bubbling.

    5.1kW, 12 × 250W + 4 x 275W + 3 x 330W solar panels , FM80 MPPT CC, WavePower 6kW pure sine inverter, 16 x Trojan 105Plus in 8s2p strings 450Ah @ 48V battery bank.
    8Kw Champion LPG gen for emergencies only.
  • Dave AngeliniDave Angelini Solar Expert Posts: 5,553 ✭✭✭✭✭
    It sounds a bit hi but as long as you keep an eye on them, give it a try. Take all precautions and make sure the area is clear of easy burning materials. Feel the terminals and wear eye protection. You might save them and you might blow them. There are a few failure modes.

    People often knock FLA batteries but in most cases the people are the weak link. I have a client in Arizona that changes his Lead acid bank every 5 years and they are still good, just lost capacity. He takes good care of them and he has to in a 100F+ ambient battery room.

    Your problems stem from using battery strings and not doing the full maintenance. Not bad for a first set so do not take it wrong. I miss the island rum. Who is best now?
    "we go where power lines don't" Sierra Mountains near Mariposa/Yosemite CA
     http://members.sti.net/offgridsolar/
    E-mail [email protected]

  • gicamucigicamuci Registered Users Posts: 26 ✭✭
    edited October 23 #38
    When I started the EQ the current was under 28A and now after an hour is at 32A. Is it normal ?
    Forgot to add: they are cool to the touch. Well... nothing is cool on this island unless it came out from a fridge. But at the ambient temp which is now 31°C.
    Either Barcelo or Brugal. They are both good. I personally like the white Brugal :) but not the 51° just the normal one on ice.


    5.1kW, 12 × 250W + 4 x 275W + 3 x 330W solar panels , FM80 MPPT CC, WavePower 6kW pure sine inverter, 16 x Trojan 105Plus in 8s2p strings 450Ah @ 48V battery bank.
    8Kw Champion LPG gen for emergencies only.
  • gicamucigicamuci Registered Users Posts: 26 ✭✭
    I chickened out after an hour an a half of EQ. The ambient temp was as 33°C and batteries were at 40°C.
    Can an equalizing session be split over a two or three days shorter sessions ?


    5.1kW, 12 × 250W + 4 x 275W + 3 x 330W solar panels , FM80 MPPT CC, WavePower 6kW pure sine inverter, 16 x Trojan 105Plus in 8s2p strings 450Ah @ 48V battery bank.
    8Kw Champion LPG gen for emergencies only.
  • BB.BB. Super Moderators, Administrators Posts: 31,156 admin
    edited November 9 #40
    Yes stop EQ on hot batteries and resume after they have cooled.
    EQ... A good rate of charge is 5% to 2.5%.
    225 ah x 0.05 = 11.25 amps target
    Lower your EQ voltage and take time (in my humble opinion).
    30 amps into 225 AH is too high. Especially in a tropical climate.
    In EQ almost all charging energy is turned into gassing and heat. Except for the "low SG" cells that are charging to full.
    Bill
    Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
  • gicamucigicamuci Registered Users Posts: 26 ✭✭
    Your problems stem from using battery strings and not doing the full maintenance. Not bad for a first set so do not take it wrong.
    No worries. Next set of batteries will sure be some 8 x L16s as suggested earlier, if I will find them to buy on the island.

    Number 1 did not improve at all after 2 days of charging it. Those 2 cells are still at 1.220 SG. I guess number 2 will be the same with its cell at 1.220
    I am not really prepared to change all 16 of them at this time and I might try buying just 2 to replace the bad ones and see how far I can go with them (I know is not recommended to mix new and old bats).
    I did limit the charge current on the FM80 so the remaining 8 will not suffer.
    Thank you guys for your time and valuable advice. Some good learning on this discussion.
    5.1kW, 12 × 250W + 4 x 275W + 3 x 330W solar panels , FM80 MPPT CC, WavePower 6kW pure sine inverter, 16 x Trojan 105Plus in 8s2p strings 450Ah @ 48V battery bank.
    8Kw Champion LPG gen for emergencies only.
  • Dave AngeliniDave Angelini Solar Expert Posts: 5,553 ✭✭✭✭✭
    If you can get 2 at a reasonable price on the island and you understand that it will be temporary. Does DR have Costco?
    You can get a golf battery in most costco locations. A bit cheaper than a Trojan golf battery. For this kind of "not optimum" operation it really is not going to matter. You are going to have to really watch them !  A decent name brand near 400AH battery should be around $350 each. Drop me an email and I can hook you up with someone I know who does this alot.

    What is the good rum make in DR.  I can't remember but when we were anchored there we bought a case. Just add ice!
    "we go where power lines don't" Sierra Mountains near Mariposa/Yosemite CA
     http://members.sti.net/offgridsolar/
    E-mail [email protected]

  • gicamucigicamuci Registered Users Posts: 26 ✭✭
    There's no Costco on the island. There's a similar store Pricemart which requires membership which I don't have yet.
    Only 2 models of batteries are everywhere here. The Trojan's T105Plus and Trace T225. For the price difference of US $20  I'll buy a Trojan one. A friend told me that L16 batteries are starting to appear in some stores.
    5.1kW, 12 × 250W + 4 x 275W + 3 x 330W solar panels , FM80 MPPT CC, WavePower 6kW pure sine inverter, 16 x Trojan 105Plus in 8s2p strings 450Ah @ 48V battery bank.
    8Kw Champion LPG gen for emergencies only.
  • gicamucigicamuci Registered Users Posts: 26 ✭✭
    My conclusion is that I have an energy production which is too big for the battery bank I have (or I need a bigger battery bank). During daytime our house pulls somewhere between 15A to 20A. Plus the charge rate recommend for my 450Ah battery bank (45A) it gives me some 60A or 65A for the limit I should use on the FM80 with the whole battery bank in service. Did I get it right ?

    5.1kW, 12 × 250W + 4 x 275W + 3 x 330W solar panels , FM80 MPPT CC, WavePower 6kW pure sine inverter, 16 x Trojan 105Plus in 8s2p strings 450Ah @ 48V battery bank.
    8Kw Champion LPG gen for emergencies only.
  • PhotowhitPhotowhit Solar Expert Posts: 5,413 ✭✭✭✭✭
    gicamuci said:
    My conclusion is that I have an energy production which is too big for the battery bank I have (or I need a bigger battery bank). During daytime our house pulls somewhere between 15A to 20A. Plus the charge rate recommend for my 450Ah battery bank (45A) it gives me some 60A or 65A for the limit I should use on the FM80 with the whole battery bank in service. Did I get it right ?

    Yes, if you have a regular load that high, you should try to account for it.
    Home system 4000 watt (Evergreen) array standing, with 2 Midnite Classic Lites,  Midnite E-panel, Prosine 1800 and Exeltech 1100, 660 ah 24v ForkLift battery. Off grid for @16 of last 17 years. Assorted other systems, and to many panels in the closet to not do more...lol
  • gicamucigicamuci Registered Users Posts: 26 ✭✭
    edited November 9 #46
    I was lucky to find two used good Trojan 105 batteries and replaced number 1 and 2 (SG didn't recover on those cells).
    The 2 "new" ones are just 6 months older than the rest I have.
    I gave them a charge individually and then I EQ the string.
    All is good now 😊
    I also moved the cables from the negative post on the upper string to the lower string.
    While under load (20A) 9A is coming from the upper string and 11A from the lower string (the hot one with issues).
    It is way better than before when the lower string was stressed under load.
    5.1kW, 12 × 250W + 4 x 275W + 3 x 330W solar panels , FM80 MPPT CC, WavePower 6kW pure sine inverter, 16 x Trojan 105Plus in 8s2p strings 450Ah @ 48V battery bank.
    8Kw Champion LPG gen for emergencies only.
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