Good Sam Club Open Roads Forum: SiO2 Battery -UPDATE 5 (Two Batts)
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 > SiO2 Battery -UPDATE 5 (Two Batts)

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noteven

Turtle Island

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Posted: 11/11/20 08:20am Link  |  Quote  |  Print  |  Notify Moderator

Haven't SiO2 batteries been used for many moons in "serious" applications - medical equipment, remote communications etc. prior to RV use?

BFL13

Victoria, BC

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Posted: 11/14/20 05:10pm Link  |  Quote  |  Print  |  Notify Moderator

Last report was that with the wiring zoo before, I got about 30 minutes of microwave time at 65 amps (average) and the inverter alarmed at 11.1 volts with the SiO2 at 60% SOC

With the new set- up (see photo in earlier post) and over 3 days, this inverter was on a lot and the microwave was on for about 20 minutes total, plus minor 120v loads and the inverter on standby.

Battery showing 12.1 on return home, ran inverter and microwave for about 15 minutes till it alarmed at 11.0 v and quit at 10.5v , then voltage bounced back to 11.7, which is 20% SOC on the SiO2.

Very pleased with that! [emoticon] I still have room for improvement using fatter wires inverter-battery and to run the inverter's remote on/off switch to inside the camper to reduce wasted battery on standby.

So being able to run the "700w" MW with the single 100AH battery down to 20% is HUGE (IMO). Gives those Li guys some competition there! [emoticon]


1. 1991 Oakland 28DB Class C
on Ford E350-460-7.5 Gas EFI
Photo in Profile
2. 1991 Bighorn 9.5ft Truck Camper on 2003 Chev 2500HD 6.0 Gas
See Profile for Electronic set-ups for 1. and 2.

BFL13

Victoria, BC

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Posted: 11/24/20 04:49pm Link  |  Quote  |  Print  |  Notify Moderator

The latest is that camping in the MH with just two 6s last week was unsat. Needs four 6s. Had to run the gen every day and was losing. Usage was 80AH per day, and a 50-80 recharge by generator is 30% of 230AH, or 69AH.

Meanwhile the SiO2 is in the TC with the other two 6s that came from the MH. So The fix is to get another two 6s-- or for more money, another single SiO2 for the TC.

That would be 200AH of SiO2, so I could use the 55 amp converter ok, and the one TC solar set would be on them too. Right now it is on the two 6s, no solar for the SiO2. It would also free up that compartment in the TC for stuff.

I would rather get the second SiO2 than more 6s, but it is more money. In this case, whatever the price diff would be for the SiO2 vs the two 6s, so not the whole price of the SiO2 like last time. Not sure which way I will go. No hurry. The way the TC is now works great, but it would be just as good or better with two SiO2s and put the 6s back in the MH.

noteven

Turtle Island

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Posted: 11/25/20 05:57am Link  |  Quote  |  Print  |  Notify Moderator

noteven's 12volt Life for Dummies Rule No. 3: Canuck camper who has thin blanket and not enough amp hours for heating will get cold.

3 tons

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Posted: 11/25/20 11:23am Link  |  Quote  |  Print  |  Notify Moderator

BFL13 wrote:

The latest is that camping in the MH with just two 6s last week was unsat. Needs four 6s. Had to run the gen every day and was losing. Usage was 80AH per day, and a 50-80 recharge by generator is 30% of 230AH, or 69AH.

Meanwhile the SiO2 is in the TC with the other two 6s that came from the MH. So The fix is to get another two 6s-- or for more money, another single SiO2 for the TC.

That would be 200AH of SiO2, so I could use the 55 amp converter ok, and the one TC solar set would be on them too. Right now it is on the two 6s, no solar for the SiO2. It would also free up that compartment in the TC for stuff.

I would rather get the second SiO2 than more 6s, but it is more money. In this case, whatever the price diff would be for the SiO2 vs the two 6s, so not the whole price of the SiO2 like last time. Not sure which way I will go. No hurry. The way the TC is now works great, but it would be just as good or better with two SiO2s and put the 6s back in the MH.


1) I would wonder how much of this has to do with the purported slower charge rate of Sio2 - could this be a factor?

2) Does mixing 6v’s with SiO2 cause a battery type recharge imbalance?

Just curious...

3 tons

BFL13

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Posted: 11/25/20 11:56am Link  |  Quote  |  Print  |  Notify Moderator

No the charge rates are not a factor. Also in the TC the SiO2 is by itself and only runs the inverter. The two 6s do all the usual 12v stuff. If I had two SiO2s they would be in parallel and run everything.

The two 6s down to 50% make 115AH while two SiO2s down to 20% would make 160AH. That is with comparable 20 hr rates 11.5 amps vs 10 amps. So the two would be as good as having one on inverter and the two 6s on the rest for operating when the inverter AH are 45 or less. (At 65 amps MW, 45 AH is 41 minutes.)

The problem is cost. Two more 6s would be much less cost than one more SiO2, even with the current sale price. The one SiO2 has already solved my inverter problem with the TC, so a second one would be just for convenience, not a real need. Have to figure out my priorities!

StirCrazy

Kamloops, BC, Canada

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Posted: 11/26/20 05:43am Link  |  Quote  |  Print  |  Notify Moderator

BFL13 wrote:


I would rather get the second SiO2 than more 6s, but it is more money. In this case, whatever the price diff would be for the SiO2 vs the two 6s, so not the whole price of the SiO2 like last time.


I am not sure if you ever mentioned itbut what do the SiO2 batteries run pricewise?

Steve


2014 F350 6.7 Platinum
2016 Cougar 330RBK

pianotuna

Regina, SK, Canada

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Posted: 11/26/20 07:32am Link  |  Quote  |  Print  |  Notify Moderator

StirCrazy,

Price was wrong.

* This post was edited 11/26/20 10:01am by pianotuna *


Regards, Don
My ride is a 28 foot Class C, 256 watts solar, soon to have SiO2 batteries, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

pianotuna

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Posted: 11/26/20 07:38am Link  |  Quote  |  Print  |  Notify Moderator

3 tons,

SiO2 charge much faster than traditional Lead Acid. For example, at 85% state of charge the acceptance rate for a 100 amp-hour lead acid is 12.5 amps. correction in BFL13 see his real life figures.

* This post was edited 11/26/20 10:02am by pianotuna *

BFL13

Victoria, BC

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Posted: 11/26/20 08:15am Link  |  Quote  |  Print  |  Notify Moderator

PT, mine didn't do that. See my test results way back in this thread. Amps started to taper at 87.5% SOC with a 19% charging rate. So charging was only "faster" between about 77-87%. from 50-77 is was the same time at constant 19 amps.

Some of the blurbs say you can charge at 3C for a limited period with no harm but the "standard" is 25% charging rate as the limit. I can't find any info on how long that 3C would be, so I don't dare try over the 25%

I suspect if you hit it with 3C, amps would taper quickly down to what the battery would accept, same as with any battery. Probably accepts more amps with a lower SOC same as other batteries too. No data seen on that.

You can go down to 20% SOC (or lower) though, so that lets you do a 20-90 instead of a 50-90 or a 50-80. That means your gen time is not being wasted by amps tapering while restoring 70% instead of just 40 or 30 % with no tapering.

--On price-- Azimuth is selling the 27 size 100AH at $628Can (also their US site says $449 US--which is lower at 75 cents conversion) but they have all sorts of sizes and prices.

http://www.azimuthsolar.ca/product-category/batteries/sio2/

I can get two 6s at Can Tire (they are East Penn GC15s 230 AH--an excellent 6) for just under $400 with tax, no shipping. That is nearly $300 less than the SiO2 with tax and shipping.

It could be worse --check out what Lis cost! (Way more)

Have to wait for the BC govt buy my vote money to show up or else win the Lotto I guess.

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