Questions about solar power - Page 11 - Fiberglass RV


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Old 03-14-2014, 06:39 AM   #141
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I have been looking at those flexable panels.
Ebay has them, shipped from China.
2 each 100 watt are about $450 shipped.
So about $225 each.
The ones I am looking at are on an aluminum sheet backing.
They are about 41" x 32" x 3/32" thick.
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Old 03-14-2014, 08:00 AM   #142
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Mine's got the IQ4 function built in. Manual doesn't say anything about equalization though. I'll take another look later today.
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Old 03-14-2014, 08:01 AM   #143
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Quote:
Originally Posted by stev View Post
I have been looking at those flexable panels.
Ebay has them, shipped from China.
2 each 100 watt are about $450 shipped.
So about $225 each.
The ones I am looking at are on an aluminum sheet backing.
They are about 41" x 32" x 3/32" thick.

Renogy has them for $199 and free frt.
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Old 03-14-2014, 09:33 AM   #144
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Quote:
Originally Posted by stev View Post
I have been looking at those flexable panels.
Ebay has them, shipped from China.
2 each 100 watt are about $450 shipped.
So about $225 each.
The ones I am looking at are on an aluminum sheet backing.
They are about 41" x 32" x 3/32" thick.
I like choices. Do you have a link you could post?
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Old 03-14-2014, 09:40 AM   #145
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Here you go. http://www.renogy-store.com/100watts.../rng-100db.htm
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Old 03-14-2014, 09:44 AM   #146
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I am aware of Renogy's offering, I was wondering about the product that stev found.
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Old 03-14-2014, 09:56 AM   #147
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More on battery capacity at low discharge rates. As I posted above, comparing my consumed energy in amp hours to the battery state of charge figure shows the battery (225 ah C20 rating) has a 280 ah rating at my actual discharge rate.

Last night at bedtime (82 hrs of dry camping) I had used 141 ah and soc was 49.8%. I shut everything off, including the refrigerator. This morning, ten hours later, the battery voltage was 12.02. Trojans resting voltage vs soc chart indicates I have 44%. Trojan says to remove all loads before test at least six hrs but preferable 24 hrs. I waited ten hrs. I also did not disconnect the batteries. While everything was turned off there are still very small phantom loads from inverter, charger and battery monitor. With this said, I think the voltage measurement supports the meter reading of 50% soc even though 141 ah had been drawn from the battery.

Has anyone else measured results like this?
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Old 03-14-2014, 11:13 AM   #148
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I've been following the thread with interest but one thing has puzzled me.. Is it merely scientific curiosity that you are knowingly discharging your batteries below 50%?
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Old 03-14-2014, 11:24 AM   #149
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Originally Posted by MCDenny View Post
With this said, I think the voltage measurement supports the meter reading of 50% soc even though 141 ah had been drawn from the battery.

Has anyone else measured results like this?
Try hard to avoid it! Sounds like you really need to go find yourself some power to charge up the battery or you will be buying a new one before the end of this summer
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Old 03-14-2014, 11:44 AM   #150
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I've been following the thread with interest but one thing has puzzled me.. Is it merely scientific curiosity that you are knowingly discharging your batteries below 50%?

That's how much power we used in our 4 day test. Just happened to be 49% soc.

There is nothing magic about the "don't discharge below 50% soc, though". Less discharge is good, more discharge is bad.

Trojan only says don't discharge below 80%. No mention of 50% in their user manual.

Concorde lifeline has a graph showing average life for their batteries is 1000 cycles at 50% dod to 500 cycles at 80%.

I don't think going into the 50 to 80% discharge level once in a while is going to make much difference in battery longevity.
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Old 03-14-2014, 11:57 AM   #151
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Trojan only says don't discharge below 80%. No mention of 50% in their user manual.
keep in mind Trojan is in the biz of selling batteries!
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Old 03-14-2014, 02:44 PM   #152
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Might as well stay plugged in if you followed 80% lol..
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Old 03-14-2014, 02:57 PM   #153
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Might as well stay plugged in if you followed 80% lol..

I said that backwards. Trojan says not to exceed 80% depth of discharge. 20% state of charge.
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Old 03-14-2014, 09:49 PM   #154
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From the Trojan website..Make what you will of it

Discharging batteries is entirely a function of your particular application.
However, below is list of helpful items:
* Shallow discharges will result in a longer battery life.
* 50% (or less) discharges are recommended.
* 80% discharge is the maximum safe discharge.
* Do not fully discharge flooded batteries (80% or more). This will damage (or kill) the battery.
* Many experts recommend operating batteries only between the 50% to 85% of full charge range. A periodic equalization charge is a must when using this practice.
* Do not leave batteries deeply discharged for any length of time.
* Lead acid batteries do not develop a memory and do not need to be fully discharged before recharging.
* Batteries should be charged after each period of use.
* Batteries that charge up but cannot support a load are most likely bad and should be tested. Refer to the Testing section for proper procedure.
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