Need help designing a solar charging system - Page 2 - Fiberglass RV


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Old 07-04-2015, 09:23 AM   #15
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Equalization voltage for 12V batteries is 15.5V. Charge controllers reduce the 17V coming from solar panel to whatever the batteries want, up to the maximum set by the operator (14.1V for gel). If a balanced system is designed, it will work.
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Old 07-04-2015, 10:04 AM   #16
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I must be missing something . My battery's manufacturerer specifies. an equalization
charge voltage of 15.0 VDC . My shurflo water pump specifies a maximum imput voltage of 13.6 VDC
When my solar charger is in the equalization mode , I have 15.0 VDC at the battery terminals and at my Shurflo pump terminals. If I leave the charger voltage setpoint at 15.0 VDC then my battery will equalize but I will be supplying an overvoltage to my pump . If I set the equalizatio voltage to 13.6 VDC then my pump is operating within its voltage limits. but my battery will not equalize. I checked the voltages with a fluke meter to verify the meter on the controller was accurate.
The advice I received from the trailer's equipment manufacturers was to disconnect the loads supplied by the battery when performing any charging operation where the charge voltage exceeds 13.6 VDC .
Disconnecting the loads will protect my equipment but will leave me without the use of my equipment during charge cycles .
How does one satisfy both criteria at the same time . I am assuming that
Renogy would not have stated their warning if the problem was non existant
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Old 07-04-2015, 10:07 AM   #17
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I must be missing something . My battery's manufacturerer specifies. an equalization
charge voltage of 15.0 VDC . My shurflo water pump specifies a maximum imput voltage of 13.6 VDC
When my solar charger is in the equalization mode , I have 15.0 VDC at the battery terminals and at my Shurflo pump terminals. If I leave the charger voltage setpoint at 15.0 VDC then my battery will equalize but I will be supplying an overvoltage to my pump . If I set the equalizatio voltage to 13.6 VDC then my pump is operating within its voltage limits. but my battery will not equalize. I checked the voltages with a fluke meter to verify the meter on the controller was accurate.
The advice I received from the trailer's equipment manufacturers was to disconnect the loads supplied by the battery when performing any charging operation where the charge voltage exceeds 13.6 VDC .
Disconnecting the loads will protect my equipment but will leave me without the use of my equipment during charge cycles .
How does one satisfy both criteria at the same time . I am assuming that
Renogy would not have stated their warning if the problem was non existant
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Old 07-04-2015, 11:22 AM   #18
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Steve, i think i've been comparing apples and oranges, sorry. I was imagining that your charge controller had an equalization setting, specifically sending equalization voltage to the battery only, and not to the loads. As you describe the single voltage set point, it makes sense to disconnect the loads during equalization to protect them. How often is equalization necessary?
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Old 07-04-2015, 11:32 AM   #19
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Quote:
Originally Posted by Martin B. View Post

Bonus!
I called Fan-Tastic Vent about our model 4000R. They supplied this data on current draw:
High 3.00 amps
Med 2.20 amps
Low 1.86 amps
From what I can tell, this will apply to all Fantastic Vents. The difference is in the bells and whistles.
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Old 07-04-2015, 11:53 AM   #20
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Originally Posted by Rob V View Post
Steve, i think i've been comparing apples and oranges, sorry. I was imagining that your charge controller had an equalization setting, specifically sending equalization voltage to the battery only, and not to the loads. As you describe the single voltage set point, it makes sense to disconnect the loads during equalization to protect them. How often is equalization necessary?
The solar charge controller is factory programmed to equalize the battery every 28 days for
120 minutes. The factory boost charge level is also too high at 14.6 VDC . Again I could program the boost voltage to a lower level but the minimum setting is 14.2 VDC and by lowering the boost voltage level I increase the time frame for charging my battery.
I installed a 50 amp Anderson Powerpole connector in the line between the battery and the trailer loads/ converter so I can Isolate / disconnect during the charging cycle . I realize that I could leave the trailers equipment in the off mode ( excluding the propane detector) during charging but that method is too prone to human error IMHO. I was hoping someone had devised. a method to charge at the higher voltage levels required by the battery without endangering the trailers equipment.
Thank you for your response
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Old 07-04-2015, 05:00 PM   #21
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Steve,
I made the bad assumption that you were installing an actual solar power system. I suspect that the item you got was not intended to power a travel trailer. That would explain its instructions to detach loads when charging. That is probably the only way you can use that device.
We have a dedicated controller, solar panels and gel battery. Entirely different set up.
My mistake.
Now would you like me to also post the nasty-gram you PM'd me or is this apology enough to salve your tender male ego?


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Old 07-05-2015, 01:31 PM   #22
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Most unfortunate.
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