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by Gordon-Loomberah
Sun May 13, 2018 5:50 pm
Forum: FLEXmax Charge Controllers
Topic: what about lithium ?
Replies: 40
Views: 15943

Re: what about lithium ?

Here in Australia I paid about AU$500/kWh for the CALBs, Simpliphi was about AU$2000/kWh last time I checked. Right now I'm under AU$0.40/kWh delivered for the battery cost, and the cost/kWh continues to decline.
Simpliphi is going to be more expensive per kWh, even if it lasts 3650 cycles.
by Gordon-Loomberah
Sun May 13, 2018 4:14 pm
Forum: FLEXmax Charge Controllers
Topic: what about lithium ?
Replies: 40
Views: 15943

Re: what about lithium ?

Claims about 80% cost savings vs other batteries are just that, claims. Whether or not a battery that costs 4X as much can last 5X as long in real life usage (and that is only a 20% saving over 27 years, less if the cost comes down!), rather than a test bed where extrapolations are used, remains to ...
by Gordon-Loomberah
Mon Apr 30, 2018 4:52 pm
Forum: FLEXmax Charge Controllers
Topic: what about lithium ?
Replies: 40
Views: 15943

Re: what about lithium ?

If you only bulk charge to 55.6V then float at 54.4V, the battery will still be charging, just at a slower rate- it wont really be float, just slow charge. I monitor my system with a Graphtec data logger, so am able to keep an accurate record of the SOC. My float voltage is set to be fractionally un...
by Gordon-Loomberah
Mon Apr 30, 2018 4:15 pm
Forum: FLEXmax Charge Controllers
Topic: what about lithium ?
Replies: 40
Views: 15943

Re: what about lithium ?

Which Calb cells are you using? What's the voltage and amp-hour capacity of your battery? What BMS do you use? How are you charging the pack? I have 400AH CALB, the older blue cells, they've been in use for over 5 years now. I call the nominal cell voltage 3.3V, as my long term battery voltage aver...
by Gordon-Loomberah
Fri Dec 09, 2016 12:15 am
Forum: FLEXmax Charge Controllers
Topic: Power in between zero and 10 watts ??
Replies: 30
Views: 53707

Re: Power in between zero and 10 watts ??

If the same problem is happening with different charge controllers, I think it must be a problem with the wiring, or a setting. Does the AERL CC have a voltage sense connection? Is there any comms connection with the inverter-charger? I'd recheck all connections- don't just look at them, disconnect ...
by Gordon-Loomberah
Thu Mar 17, 2016 11:58 pm
Forum: FLEXmax Charge Controllers
Topic: Power in between zero and 10 watts ??
Replies: 30
Views: 53707

Re: Power in between zero and 10 watts ??

If still under warranty I expect it will be heading straight back to OB's importer MPower.

Out of interest, what does one of the AERL 60A MPPT units cost? There isn't any pricing on their retail website.
by Gordon-Loomberah
Thu Mar 17, 2016 10:48 pm
Forum: FLEXmax Charge Controllers
Topic: Power in between zero and 10 watts ??
Replies: 30
Views: 53707

Re: Power in between zero and 10 watts ??

I see you've edited your posting :wink: What are you going to do with the faulty FM80? One of mine has suffered a failure in the squishy buttons, and it sometimes takes hundreds of presses to get it to respond, and the right hand side one has gone down the hole, so is inoperable, meaning I am stuck ...
by Gordon-Loomberah
Thu Mar 17, 2016 9:18 pm
Forum: FLEXmax Charge Controllers
Topic: Power in between zero and 10 watts ??
Replies: 30
Views: 53707

Re: Power in between zero and 10 watts ??

...check the controller anyway. It was about 350 watts and I was surprised to see the battery voltage was well over 57 V, constantly. To see if it will pull in more, I turn on a fluro, this usually makes it jump 50 or 60 watts, if there is adequate power coming from the PV. Well, it jumped up well ...
by Gordon-Loomberah
Wed Feb 10, 2016 8:08 pm
Forum: Marine Applications
Topic: flexmax 80 logging screen min voltage
Replies: 2
Views: 6309

Re: flexmax 80 logging screen min voltage

No, but it is a reasonably accurate measure of the voltage at the FM80, within a few tenths of a volt. What minimum voltage the batteries saw depends on cable size, loads, where loads are connected etc, and may be significantly different. If the Flexmax CCs had a voltage sense wire, it would be more...
by Gordon-Loomberah
Thu Jan 14, 2016 3:41 pm
Forum: Off Grid Applications
Topic: Equalizing Trojan L16E-AC: How long after float?
Replies: 12
Views: 9477

Re: Equalizing Trojan L16E-AC: How long after float?

My last set of Lead-acid batteries were Trojan 420AH, 2 strings of 4 X 6V for 24V. A couple of cells had very high SGs from the start, which was odd, but after 2 years other cells started dying off quickly. I had looked after them, never letting them discharge too deeply, but the high SG cells were ...
by Gordon-Loomberah
Tue Jan 12, 2016 4:27 pm
Forum: Off Grid Applications
Topic: Equalizing Trojan L16E-AC: How long after float?
Replies: 12
Views: 9477

Re: Equalizing Trojan L16E-AC: How long after float?

Are you temperature compensating your SG readings? The good thing with the refractometer is that it is automatic - calibrate with pure water at the same temp as the battery, and you only need one drop of acid to measure SG. However, I'm really glad I don't have to bother with any of that any more :g...
by Gordon-Loomberah
Tue Jan 12, 2016 12:32 pm
Forum: Off Grid Applications
Topic: Equalizing Trojan L16E-AC: How long after float?
Replies: 12
Views: 9477

Re: Equalizing Trojan L16E-AC: How long after float?

I don't have any particular brand recommendation for a refractometer, just avoid any el-cheapo ebay ones, which may be of dubious accuracy. I'm not sure where you are located, but I bought mine from Instrument Choice in Australia.... but haven't used it in over 3 years since I installed the LiFePO4 ...
by Gordon-Loomberah
Mon Jan 11, 2016 2:25 pm
Forum: Off Grid Applications
Topic: Equalizing Trojan L16E-AC: How long after float?
Replies: 12
Views: 9477

Re: Equalizing Trojan L16E-AC: How long after float?

Checking SGs with a hydrometer is a long and laborious process, it is much faster with a refractometer, and more accurate than your average hydrometer, but yes, using pilot cells does speed the process up a lot.
by Gordon-Loomberah
Sun Jan 10, 2016 11:36 pm
Forum: OutBack
Topic: Geeral Offgrid query
Replies: 13
Views: 10886

Re: Geeral Offgrid query

That is correct Peter, and it generally only needs doing if your SGs are not within specification. Finishing an Absorb stage in charging takes you to, in theory, 100% SOC, at which point all your SGs should be equal, or withing the manufacturers tolerance. If they are not, then it is time to do an E...
by Gordon-Loomberah
Sun Jan 10, 2016 6:26 pm
Forum: Off Grid Applications
Topic: Equalizing Trojan L16E-AC: How long after float?
Replies: 12
Views: 9477

Re: Equalizing Trojan L16E-AC: How long after float?

Equalising should be done after the Absorb stage is finished, ie once it has transitioned to Float. There is no specific time- you continue until all your SGs are within specification, making sure your battery doesn't get too hot- there is no temperature compensation in EQ mode. If all cell SGs are ...
by Gordon-Loomberah
Fri Jan 01, 2016 6:45 pm
Forum: Off Grid Applications
Topic: Lithium Batteries
Replies: 26
Views: 24769

Re: Lithium Batteries

Well, after over 3 years in use, my LiFePO4 battery is still performing very well, and is being worked quite hard. Recently I've been running a 2kW water chiller for the trout in an aquaponics system, so power use has been quite high. Compressor starting sometimes results in brief peak loads of up t...
by Gordon-Loomberah
Fri Jan 01, 2016 6:20 pm
Forum: FLEXmax Charge Controllers
Topic: Power in between zero and 10 watts ??
Replies: 30
Views: 53707

Re: Power in between zero and 10 watts ??

Did you ever resolve this issue Cephas? Do you have autorestart enabled? It restarts the FM80 every 90 mins, and if it is stuck in the "Charged" state, should kick it out of that. It also stops it from discharging the battery all night, which I've mentioned in other threads somewhere on here, along ...
by Gordon-Loomberah
Fri Jan 01, 2016 6:04 pm
Forum: FLEXmax Charge Controllers
Topic: PV array with varying azimuth
Replies: 6
Views: 5742

Re: PV array with varying azimuth

Sorry for the delay Greg, link now fixed- I missed the l at the end of html when copying.
by Gordon-Loomberah
Fri Jan 01, 2016 5:54 pm
Forum: OutBack
Topic: Geeral Offgrid query
Replies: 13
Views: 10886

Re: GeNeral Offgrid query

During the bulk stage at a relatively low voltage (approx 26.4) the charge controller displayed 'Charged' and went into the float state directly from the bulk stage, the absorb stage was omitted. Did you see it transition directly from Absorb to Float? What is the maximum battery voltage for the da...
by Gordon-Loomberah
Sun Dec 20, 2015 11:56 am
Forum: FLEXmax Charge Controllers
Topic: PV array with varying azimuth
Replies: 6
Views: 5742

Re: PV array with varying azimuth

Yes, it works perfectly well, and is ideal for spreading out the solar noon peak, although total output will be reduced. I wrote up a bit about mounting panels facing E and W to get flat output all day here:
http://forums.energymatters.com.au/sola ... c5064.html
by Gordon-Loomberah
Wed Sep 02, 2015 3:59 pm
Forum: FLEXmax Charge Controllers
Topic: FM80 Max amps
Replies: 15
Views: 12095

Re: FM80 Max amps

I cant see any reason for anything to change, the cloud edge peaks were still over 80A when I went to the latest firmware. Since then I've changed to 52V (16 X LiFePO4 cells), so haven't been over 70A with the 3.4kW of PV currently connected.
by Gordon-Loomberah
Thu Aug 27, 2015 7:36 pm
Forum: MX60 Charge Controller
Topic: Lithium Ion batteries
Replies: 10
Views: 21085

Re: Lithium Ion batteries

Would you be calculating that 98.7% by the ratio of kwH_out / kwH_IN as measured by a shunt and FN-DC? I mention kwh so that the varying voltage is part of the calculation, instead of AH. Actually, I have managed >99% after changing a few set points, but no, the FN-DC is nowhere near accurate enoug...
by Gordon-Loomberah
Wed Aug 26, 2015 6:05 pm
Forum: MX60 Charge Controller
Topic: Lithium Ion batteries
Replies: 10
Views: 21085

Re: Lithium Ion batteries

There are lots of different Lithium Ion batteries, it's a general term, and they need to be charged to different voltages, so if asking about set points, you need to specify which particular chemistry. My comments only apply to my LiFePO4 battery, these are my current set points. Summer Vabsorb 3.42...
by Gordon-Loomberah
Fri May 01, 2015 10:10 pm
Forum: FLEXmax Charge Controllers
Topic: FlexMax 60 "skipping" a day
Replies: 3
Views: 3755

Re: FlexMax 60 "skipping" a day

My FM80s occasionally lose a day- scroll back and the day is missing from the log. It's no real issue though, as I have much more extensive and accurate data logging in place. It can look ok in the late afternoon- the day is logging ok, but when I check in the morning, which is when I record it in a...
by Gordon-Loomberah
Fri May 01, 2015 9:52 pm
Forum: OutBack
Topic: Tesla's new solar battery - Anyone see this video?
Replies: 12
Views: 7123

Re: Tesla's new solar battery - Anyone see this video?

I'm pretty sure they aren't retail prices. These batteries are aimed squarely at the grid-connected inverter market, hence the high DC voltage. Max operating temperature of 43C is a pretty serious limitation if you live somewhere hot, like much of Australia, or SW USA. I was hoping this announcement...