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I don't believe the battery is oversize, every recommendation I have seen for FLA says don't discharge more than 20% most times. A typical daily cycle here will draw these down to 15-18%, with days of heavy cloud I would let it get to 50%. Any more than that and I will be starting a generator. At those drawdowns, I should get maximum life from them according to the charts I have seen, keeping the temperature down is another factor, if they are at 35 degrees it halves the life compared to 25 degrees. Soon I will be moving to a new property where I will be able to have a 500W micro-hydro operating when it is rainy, with this I hope to never need the generator.

For forklift use they say to equalize once a week, that is with bigger drawdowns than I will be having. My plan is to equalize once a month as I have been before. With full sun (most days) my solar panels charge at around 100 amps and the batteries are floating by 1 PM doing an equalization charge is no problem. I believe there is a trade-off between sulphation/stratification and plate life due to higher temperatures/corrosion.

The watering system is nice but in a way is pointless as the specific gravity should be checked regularly anyway. To do that you have to pop the caps off, my old battery bank is lots of old golf cart batteries. Adding water to them was a real PITA as there are 216 cells (24 X 9), this new battery only has 24 cells so it will be much quicker.

Also I am very wary of the battery people saying tap is okay, we rely on rain water for the house. Even that has dust in it and metal ions from the house roof the same as water from a AC.
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Yes, it does follow the temperature of the battery.

Maybe unplug the temp sensor and try ?

boB

I'll try that the next time I get out there. But I don't think it's a temp sensor issue, because it's correctly compensating the charge voltages.
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Does the Clssic SL use the same MNGP as the regular Classic?

I only have Midnite Lite's and have been thinking about getting a MNGP, and a spare would be nice as well, I only have solar so was thinking about getting a Classic SL to use as a spare. It would be no hassle using it in a slave/Follow me mode.
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I don't know about import duties, but Northern Arizona Wind and Sune, have it a bit discounted on their site and are currently having a 10% off sale. Of course shipping and duties if they apply might make it not very affordable, but I thought I'd pass it along. Might try to find someone who has their classics setup master and slave. I just have Classic Lites and would like a display so i'm sort of in the same boat. Thinking I might buy a Classic SL and have a back up as well. So I'm hunting to see if it has the same display.

https://www.solar-electric.com/clgrpa.html
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Yeah that watering system would be good.
The caps I have had on my batteries of the past did seem to help but they also eventually get clogged up . Although later I read where it said to flip them open during equalizing - oops never did that ! No problems now cause I have some gel batteries - nice to not have to mess around with watering them but keeping fingers crossed they live up to their rated life time !

Seems like golden rule is never ever ever put anything but distilled water in a battery . That battery dealer either doesn't know much or has some very pure water !

Look up one of the charts for lead acid batteries sometime for depth of discharge vs how many cycles you get .

The only other thing that I have heard about having a huge oversized battery like you have and don't cycle it deep is  is that the electrolyte can stratify so you need to take it down deep every so often and get it charging so that the electrolyte mixes up . I think it might be like once a month - not sure but there is someone I can ask. Thing is you need to be able to pour a lot of amps in to do that . I don't think you mentioned how many amps your system is . Use a generator if you have one and need to use it to help get those batteries bubbling good after the deep cycles.

I think Bob also mentioned in past that it may be good practice to just do extended Absorb time every ten days or so to keep stratification away . So when I had my lead acid I set up the Equalize for every 10 days with long Absorb time - if I needed real equalization then I would just change the settings as needed to accomplish that .

Larry
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Yes the watering system is included, they tell me water from the tap is fine but I already have my own water distiller so I will keep using that. It operates when there is power to spare from the solar panels.

The more I read about these type of batteries the more I realize how tough they have to be. Regularly drawn to 20% SOC or less and charged up again every day. Plus not always getting the water topped up etc they have to cope with a lot. I would have to go 3 days with very cloudy weather to get down to 50%, I would not let them go past that, normally would be around 15% discharge each day.
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Larry,

From the photo looks like he has a watering system to fill the cells. These work great and fill to the correct level.

I tried the yellow water miser caps before I put my watering system on and didn't really think they made much difference IMHO.

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Consider that in a forklift these batteries get all kinds of abuse that would not be happening in home use . Yes I would put them back in the case too after you relocate them. Also consider getting some hydro caps or water miser caps to cut down on how much you have to water them .

Larry
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I had wondered if that would be an issue, the temperature is something I need to deal with though as we often get well above 30 degrees and where I have the batteries at present gets a few degrees warmer than that. I have air conditioning there but it does not cool it properly.

Even with temperature compensation (which I do use), higher temperatures reduce battery life.

30 C is warm but not that hot. We can see 110 F on hot days and my prior set lasted 14 years with only one cell being a problem. Maybe piping the A/C directly at the cells.

But the case issue can warp the inside plates which is a bigger problem.
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I had wondered if that would be an issue, the temperature is something I need to deal with though as we often get well above 30 degrees and where I have the batteries at present gets a few degrees warmer than that. I have air conditioning there but it does not cool it properly.

Even with temperature compensation (which I do use), higher temperatures reduce battery life.
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