Re: [RE-wrenches] 4 ways to keep a battery for a long time

On Dec 17, 2015, at 11:55 AM, Ray Walters wrote: ...but as far as I can tell, every other storage chemistry has similar characteristics: lower capacity at low temps, a high temp limit, non-linear cycle life depending on DOD, Puekert's exponent relating capacity vs charge/

Re: [RE-wrenches] 4 ways to keep a battery for a long time

HI Ray, I think you are right. But for example, lithium have a really flat voltage curve, and then drop like a stone. And mostly can handle extreme C/D rates with no issue. VS LA which have much more of a actual curve on voltage and extreme C/D rates really impact capacity and wear. And for

Re: [RE-wrenches] 4 ways to keep a battery for a long time

Hi Larry; LFPs definitely have some internal resistance and therefore are subject to Puekert's law, they just have an exponent that is closer to 1. Yes, they also have a higher operating temperature, but it still has a limit. My point is that if you develop software to better model FLA

Re: [RE-wrenches] 4 ways to keep a battery for a long time

With relays you can set the A/C up as a dump load that will activate when the grid goes down. At 06:59 AM 12/17/2015, you wrote: I have a customer that has had AGM batteries in the Caribbean for many years without any sign of capacity loss, but...they air condition (?) the room they are in,

Re: [RE-wrenches] 4 ways to keep a battery for a long time

as i understand it agm batteries are lead calcium. my personal experience has shown me that lead calcium is THE battery for ups systems. to reiterate previous emails about this: i have two grid tied systems here at home, both with battery backup (outback gvfx series) inverters. one has 1986

Re: [RE-wrenches] 4 ways to keep a battery for a long time

Jay, And, and, and, indeed. There are SO many factors affecting battery life. With some battery capacity monitors (like Blue Sky Energy IPN-Pro), you can see the total kWh removed from a battery bank since it was installed. But that data does not consider the non-linearity of the DoD/Cycle

Re: [RE-wrenches] 4 ways to keep a battery for a long time

I'm experimenting with a panel I built myself that is series'ed and paralleled to produce a Voc of ~3.3 volts and ~10-12 amps which can be alligator clipped to slacker 2V cells, leads running outside to a sunny locale. It's certainly not the quickest/best solution but worth a try in some

Re: [RE-wrenches] 4 ways to keep a battery for a long time

I have a customer that has had AGM batteries in the Caribbean for many years without any sign of capacity loss, but...they air condition (?) the room they are in, and they do not use any discharge, they are purely setup as a UPS style system. Unless the power fails, all the power is exported, and

Re: [RE-wrenches] 4 ways to keep a battery for a long time

Hi Larry, I've talked to Ralph about adding temp comp and puekerts. But he doesn't know think that it matters, I don't agree with him though. http://bogartengineering.com/sites/default/files/docs/PeukertsComments.pdf Jay Peltz power. > On Dec 17, 2015, at 7:26 AM, Starlight Solar

Re: [RE-wrenches] 4 ways to keep a battery for a long time

Hi Larry and Jay; I totally agree, that taking into account charge and discharge rates, DOD, and temperature, we should be able to more accurately model a battery's lifespan. We already have temp sensors at the battery, so it seems just a matter of software to do this. Also battery's

Re: [RE-wrenches] 4 ways to keep a battery for a long time

HI Todd, Thats not my understanding. VRLA batteris come just like FLA, cycling and non cycling. I can’t speak to the non cycling as I don’t use them. But cycling VRLA are lead/antimony, not lead calcium. jay peltz power > On Dec 17, 2015, at 8:56 AM, toddc...@finestplanet.com wrote: > > as i

Re: [RE-wrenches] 4 ways to keep a battery for a long time

HI Ray, yep agreed, the brain power is going towards Lithium. Thats what I would do. Schneider also has a high temp shut down. Not sure about OB, or magnum. cheers, jay > On Dec 17, 2015, at 10:55 AM, Ray Walters wrote: > > Hi Larry and Jay; > > I totally agree, that

Re: [RE-wrenches] 4 ways to keep a battery for a long time

I didn't install it but it was well done, has three Sunny Islands and three Sunny Boys. My only involvement has been to repair a breaker that failed, and to service the generator. On Thu, Dec 17, 2015 at 11:18 AM, Drake < drake.chamber...@redwoodalliance.org> wrote: > With relays you can set the

[RE-wrenches] 4 ways to keep a battery for a long time

We recommend an EQ when there is a 0.02 SG differential on any one cell to the rest of the pack, use a refractometer for SG readings, install watering systems with a electrolyte port or water the battery bank ourselves, & do not do systems without a charging power backup.