My Solar Install - Page 4 - Fiberglass RV


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Old 03-29-2014, 10:13 AM   #43
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I am surprised that my present battery is holding up so well. I'm going to repurpose it for my ham radio station as emergency backup power. I can still get more than 70 amp hours out of it.
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Old 04-01-2014, 09:32 PM   #44
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Last two panels installed. I have a few minor thing to wrap it up. Four more bolts, some cable ties, and a bit more Dicor. It was late in the day. Tomorrow will give me a peak at the production. Tonight I'm off shore power and running my battery down to see how it charges tomorrow.

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Old 04-02-2014, 08:35 AM   #45
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9 am at 9 am on am overcast day so far.
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Old 04-03-2014, 10:04 PM   #46
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Where do you run the power after the battery?

Hi all, I took the jump recently and started my small solar system. I have a 100 watt panel going to a 35 amp schneider charge controller going to a fuse to the stock casita battery. I also got a meter to measure usage and charging info. Perhaps it's really obvious and I am missing it but my questions are.

is it ok to just leave the battery hooked up to the trailers charge converter and run the 12 volt items, lights fan ect.

Does the trailers charge converter draw current off the battery?

Thank you

Mak
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Old 04-04-2014, 01:30 AM   #47
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Quote:
Originally Posted by tmaken2157 View Post
Hi all, I took the jump recently and started my small solar system. I have a 100 watt panel going to a 35 amp schneider charge controller going to a fuse to the stock casita battery. I also got a meter to measure usage and charging info. Perhaps it's really obvious and I am missing it but my questions are.

is it ok to just leave the battery hooked up to the trailers charge converter and run the 12 volt items, lights fan ect.

Does the trailers charge converter draw current off the battery?

Thank you

Mak
What are you using to meter usage?

The trailers converter converts AC shore power to DC and also will charge your batteries. No current is drawn off the battery. Current is drawn off by the loads--lights, water pump, etc. If you are plugged into shore power you will be using power from either your solar or your converter or perhaps both.

You can leave them both hooked up. If you don't have any shore power, you may want to switch off your loads during the day so the solar panels can charge batteries and recover as much power as possible.
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Old 04-04-2014, 08:25 AM   #48
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Thanks for the reply, the monitor is a Victron Bmv-600s. The trailer charge control is a parallax 7345. Looks like its a single stage fry your battery type unit that should be modified into a three stage. A 200 dollar upgrade. before I do that may I pick your brain a bit.

I have a PMW solar charge controller (xantrex c35)

When hooked to shore power The trailer parallax will send 13.8V to the battery if it needs it or not.

Is it possible to disconnect solar panel input to the Xantrex, route the parallax output back to the solar charger and charge the battery properly when hooked to shore power.

Thanks for your posts, there is a lot of over simplifications of solar out there and its nice to see the real deal.

Mak





BMV-600S series - Victron Energy
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Old 04-04-2014, 12:03 PM   #49
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Is it possible to disconnect solar panel input to the Xantrex, route the parallax output back to the solar charger and charge the battery properly when hooked to shore power.
Your parallax is designed to be connected to a battery, your charge controller is designed to receive input from a solar panel. They aren't designed to work together and usually your controller manual will have warnings against doing so. Connecting them should result in the controller showing a fault/error but it might also damage the controller.
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Old 04-04-2014, 01:03 PM   #50
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THank you Multi-task, Your answer is certainly safe enough however, I am not entirely convinced. The power converter is designed to output 13.8 volts to the battery continuously. The charge controller can accept that voltage easily, perhaps you might want a "gizmo" in line to keep spikes out that might cause damage.

So I was interested in what an elctrical engineer might think of something like that.
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Old 04-04-2014, 01:56 PM   #51
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THank you Multi-task, Your answer is certainly safe enough however, I am not entirely convinced. The power converter is designed to output 13.8 volts to the battery continuously. The charge controller can accept that voltage easily, perhaps you might want a "gizmo" in line to keep spikes out that might cause damage.

So I was interested in what an elctrical engineer might think of something like that.
When your converter is connected to your solar charge controller it's not under any load, it also won't read the battery voltage as it's not available from the pv input on the charge controller. This should mean that it's providing 0 amps so it won't accomplish what you're expecting.
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Old 04-04-2014, 02:45 PM   #52
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OK so much for that option.

I don't know enough to argue, I do know enough to say thanks for your input.

Do you folks have a schematic for a simple solar hook up I could use for a Casita?

Its been a long winter and we are chompin at the bit to get out of dodge for a while
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Old 04-04-2014, 02:54 PM   #53
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This diagram pretty much shows everything you could do so you can pick out the pieces of your system and see how they're connected.
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Old 04-04-2014, 02:58 PM   #54
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Your missing the inverter.
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Old 04-04-2014, 03:11 PM   #55
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Inverter is after the DC fuse panel. I just pasted this from another site 'cause I thought it would help a little:-)
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Old 04-04-2014, 03:21 PM   #56
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Originally Posted by tmaken2157 View Post
OK so much for that option.

I don't know enough to argue, I do know enough to say thanks for your input.

Do you folks have a schematic for a simple solar hook up I could use for a Casita?

Its been a long winter and we are chompin at the bit to get out of dodge for a while
Simplest schematic is to mount the controller someplace dry close to the battery - some put them inside the trailer some put them outside in a water tight box by the battery and connect it to the battery -leave it connected all the time. Then decide if you want to permanently mount your panel or leave it loose so you can easily move around the campsite and just unclip it from the controller and store it in the trailer when traveling. Doesnt get much simpler than that and has worked well for me for several years.
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