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Old 06-22-2016, 08:40 PM   #21
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Forgot to mention... What's with voltage drop?
I have 32.6 volts at the panel and 32.6 volts at the controller.
Over 35' of 8 and 6 gauge wire.
Voltage drop is over rated
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Old 06-24-2016, 01:54 PM   #22
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Klassic, where di you get the solar components from? Is that a residential panel? I still haven't figured out the difference between what a residential solar place and rv place sells as far as using either on a trailer. The residential ones seem to be larger and cheaper $/watt. I plan to put on about 500w of solar this summer. Already have 4x 6v AGM & 2kw inverter installed in the gen compartment. I'll put the solar hdw there too and run the feed down the toilet vent stack.
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Old 06-24-2016, 06:03 PM   #23
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Very nice Klassic!


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Old 06-24-2016, 08:16 PM   #24
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Originally Posted by PlayersZ28 View Post
Klassic, where di you get the solar components from? Is that a residential panel? I still haven't figured out the difference between what a residential solar place and rv place sells as far as using either on a trailer. The residential ones seem to be larger and cheaper $/watt. I plan to put on about 500w of solar this summer. Already have 4x 6v AGM & 2kw inverter installed in the gen compartment. I'll put the solar hdw there too and run the feed down the toilet vent stack.
I got it in Mississauga, $250 260 watt
It's 5'5" long
SAW Technology - Selling Wind Turbines and Solar Energy Systems

Here is the specs
http://www.jinkosolar.com/ftp/EN-JKM270P-60(4BB).pdf

The Morningstar I got from the US... Too expensive here.
My wife happened to be in California and I Amazon 1day shipping to her hotel.
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Old 06-24-2016, 08:27 PM   #25
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Thanks Tom.

I don't know if my 2 T105's are giving me troubles or not, but I unplugged shore power with full batteries at 7am. Residential fridge running. Full sunny day.
Still had full batteries at 7pm. Overnight the batteries ran down. By morning batteries were around 12.3v. Another full sunny day and the panel had to keep up with the fridge and batteries. It's a little too much.
Lasted until 12am and the low voltage alarm was flashing.

I can't get 2 nights. And that was not actually using the trailer. If I had 4 batteries I would be good. If I had 500 watts then the batteries would have charged again for another night.
If I wasn't in full sun for both days I wouldn't have made it until 12am the next night.
Maybe I need a small genny too just in case.
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Old 06-24-2016, 08:35 PM   #26
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Klassic's turn for solar.

Maybe you need 2 more batteries and another panel! Lol

I'm following this thread to see what you come up with. I'd like to add solar one day myself.


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Old 06-25-2016, 06:11 AM   #27
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Thanks Tom.

I don't know if my 2 T105's are giving me troubles or not, but I unplugged shore power with full batteries at 7am. Residential fridge running. Full sunny day.
I do not think the batteries are giving you any problems, I think they are telling you that they need some assistance, like more charging power and possibly 2 more batteries, but I think the SOLAR charging capabilities is your main issue.
Still had full batteries at 7pm. Overnight the batteries ran down. By morning batteries were around 12.3v. Another full sunny day and the panel had to keep up with the fridge and batteries. It's a little too much.
Lasted until 12am and the low voltage alarm was flashing.
The key point here is that your SOLAR is having a difficult time trying to supply enough power to both the fridge and the batteries. If it were me I would start by adding 1 more SOLAR panel, to eliminate the daytime power supply portion. See if that is enough to care for both your daytime fridge usage and supply enough power to fully recharge the batteries. One more additional thing to think about.. your are in the summer months and the SOLAR panels have a lot of sun to make them happy, come Fall, Winter and Spring, your source of sunshine will be drastically reduced, so additional SOLAR panels will be required if you plan on camping during those seasons

I can't get 2 nights. And that was not actually using the trailer. If I had 4 batteries I would be good. If I had 500 watts then the batteries would have charged again for another night.
If I wasn't in full sun for both days I wouldn't have made it until 12am the next night.

You will notice that your voltage at the end of the charging part of the day, your batteries will be between 13.1 and 12.8 volts. If you monitor the voltage, you will notice that the voltage drop between 13.1 and 12.8 will be like a roller coaster ride down and 12.8 and 12.6 is still a fast pace, but once you hit 12.6 it is a much slower decline to 12.2. I am thinking that your current SOLAR is not giving you a full charge, while trying to keep the fridge running also. Adding the additional panel(s) should get you through the day and those not so sunny days. Can you measure the Ah's used and the Ah's being put back into the batteries during the day? Do you have the fridge/freezer turned on to the max cold temperature?

Maybe I need a small genny too just in case.
Don
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Old 06-25-2016, 06:51 AM   #28
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volts. If you monitor the voltage, you will notice that the voltage drop between 13.1 and 12.8 will be like a roller coaster ride down and 12.8 and 12.6 is still a fast pace, but once you hit 12.6 it is a much slower decline to 12.2
Yes Don. Exactly what happens. Then it hangs around 12.2-12.11.
Maybe I would get the next night but I'll be probably 30-40%.

My first thought was fridge temp management. Freezer is at 0F and fridge is 36F. Lower would be better.

I'll probably end up getting 2 more batteries and keep them on a seperate bank with my selector switch.
I have 2 T105's and a 12v now in a seperate bank. The 12v is to make sure I can still close the slides and put the rig back on the truck if I drain the Trojans.

I'm only trying to get 2 nights max. I'm not much of a boon docker.
And trying stay charged if I have to park the rig for hours without power.
Like today I'm heading out 2 hours then staying in at a Walmart, then leaving the rig parked in another parking lot the next day.

I used to do this all the time with the SOB. This residential fridge is the killer.
But i love it. Ice...filtered water...all the room in the world...no vents on the outside for wasps...no fan to worry about in the slide.
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Old 06-25-2016, 07:17 AM   #29
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Originally Posted by klassic View Post
I'll probably end up getting 2 more batteries and keep them on a seperate bank with my selector switch.
I have 2 T105's and a 12v now in a seperate bank. The 12v is to make sure I can still close the slides and put the rig back on the truck if I drain the Trojans.
I would go with one more SOLAR panel, and that should easily get you enough power to care for both the fridge and charge the batteries. Once you have verified that the additional SOLAR panel is enough to care for your electrical demands, you can then look into adding the additional batteries all tied together, and your additional panel will also care for them, as you have already figured out how much you need to meet your electrical needs (Ah's needed). This will move you from the 50% usage bracket to the 20% usage bracket, which will increase their life. If you go with the batteries first, you already know that your current SOLAR is not enough for the existing batteries, and will not handle 2 more batteries. One of the other issues with deep cycle batteries is that they do not like to be lower than a full charge for extended lengths of time. With the type of loads that your batteries currently have, I would recommend that you have the Morningstar equalize them every 3 or 4 months.


I'm only trying to get 2 nights max. I'm not much of a boon docker.
And trying stay charged if I have to park the rig for hours without power.
Like today I'm heading out 2 hours then staying in at a Walmart, then leaving the rig parked in another parking lot the next day.
The additional SOLAR panel should get you through those couple days easily
Good Luck
Don
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Old 06-25-2016, 07:42 AM   #30
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Thanks Don.
My alligator arms kept me from digging deep into my pockets and I only went with the Morningstar MPPT30.
Even thought the panel would only be $250. I don't think my controller is big enough?
I know it would handle the extra power and the extra panel would be better in low light situations.
I should have got the MPPT45.

I plugged my numbers into Morningstar's string calculator, and 500w certainly isn't "optimal"
What do you think?
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