Ralph Day wrote: »
In case nobody told you...liquid dish soap before you try to pull. Then get it off your hands
I have 8 8L16 370AH Deka’s and 10 205W panels. I use 60 – 100AH a night (3-5KWH). So I think that’s about 70-75%SOC give or take. IMO these batteries are hard to get to 100%SOC so I probably get them to 90 – 95%SOC most every day. We also use about 2-3KWH during the day. That’s 5 – 8KWH total each day.
My XW bulk and absorb voltage is set to 60.5V, the trimetric shows battery voltage of 49.5 with these settings. I have measured .3V drop @20Amps from all the cables combined. What I am getting at is that I have the voltage set high so my SG gets close to full.
I expect Xantrex does that 1 hour limitation because equalizing for 7 hours straight is not a good idea. That could lead to excess water loss and warped plates from all the heat produced internally. Normally you EQ for an hour, check for improvement in SG, and then do it again. You stop when there's no further improvement.
Don't knock the 'cheap' hydrometer; it seems good enough. It's all in how you use it, and you seem to have done it right! Your cells are within 0.010, and chances are it couldn't be any closer.
lifelady wrote: »
Hi, I have been living off-grid since 1994 and just now I need to get a new battery bank. I currently have the Trojan L16. These have lasted 15+ years. I did not see these on your list. I am leaning toward the Trojan L16RE-B's this time. Does anyone have experience with these??? Thanks...
I currently have the Trojan L16. These have lasted 15+ years. I did not see these on your list.
I want to know where you are likely to invest at ~8% (with any security) in the current environment? LOL!
whitestrabbit wrote: »
Well, I ended up buying 8 blemished Deka 8L16s. These are supposedly brand new batteries. Only thing I could tell as far as blemish is the terminals are a little crooked. Couldn't pass up the price for what seems like a decent quality battery. $1200 for 8 including tax or about $137 each + tax. I will see how it goes once we get the solar panels installed in and possibly get 8 more if overnight DOD is too large. Hoping to get the hydro up and running next winter so maybe 8 L16s will be enough. Our creek is still running strong a week after the last rain and 6 days of sun so I think it's a solid power source. Also spoke to a few micro-hydro turbine vendors and they felt we have a good application. You can switch out the nozzles on the turbines as stream flow varies and realistic output for our head/flow seems to be in the range of 5-24kWHrs/day.
Jeffkruse - thanks for the info. Has using the higher bulk & absorb caused any issues? What is the water usage like? Did you ask Deka about this?
The Deka spec linked below indicates charge voltage of 2.35VPC (56.4V) and float of 2.25V (54V).http://www.mrsolar.com/pdf/MK_Battery/MK8L16.pdf
What do you have your equalize voltage set at?
How long, and how often do you equalize? The XW6048 can only equalize 1 hour max. I asked Xantrex if I can set it to longer than an hour and they said no but I could change the custom bulk/absorb voltages to equalize level temporarily to do a longer equalize. That seems kind of cheesy. Not sure why they don't just put in a timer option for the equalize button.
Just hooked up the new batteries and charging them now at 60.5V. For the next week or so no solar panels so want to make sure they don't discharge below 50% so trying to make sure the AGS is set up properly.
What is your inverter cut out voltage set at?
I know you said you have grid so not sure if you use a generator. Do you use the AGS (automatic generator start) ?
If so, and if you have the time, would be interested to know how you configured the following?
Start DCV 30 sec
Start DCV 15 min
Start DCV 2 hr