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Old 02-27-2015, 08:45 PM   #1
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PWM or MPPT; Series or parallel

Considering adding 2x100w panels to my 21' travel trailer. Trailer has 2x group 24 batteries, no room for more. Question: Should I use PWM or MPPT controller, and/or series or parallel? Will use #6 wire (25') from panels to controller. Must use the 100w panels due to space limitations. No inverter for now. Thanks for the help!
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Old 02-27-2015, 10:47 PM   #2
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Old 02-27-2015, 11:29 PM   #3
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wire in parallel to a quality Morningstar PWM controller
Parallel to mitigates shading issues (if series and one is shaded both are impacted)

IMHO, YMMV, etc.


Write up of my system
Attached Files
File Type: pdf VSheetz - Solar Setup for my RV v1.1.pdf (473.7 KB, 66 views)
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Old 02-28-2015, 10:31 AM   #4
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MPPT or PWM only

Quote:
Originally Posted by cruzbill View Post
Considering adding 2x100w panels to my 21' travel trailer......Question: Should I use PWM or MPPT controller, and/or series or parallel? .....
The kind of controller depends on how high the operating voltage (Vmp) is and how important it is for you to capture every bit of power you can from the sun. For only 200 Watts, the cost per Watt gained with MPPT is really high.

If the Vmp is low, a simple PWM controller won't waste much of your power. At 11 amps you have many low cost choices for a 3 stage controller. Have a look at the Sunsaver SS-20L-12. It is 3 stage, has temperature compensation and is sealed so it can be mounted near the battery.

Wiring in series has drawbacks as mentioned by Vince. The controller is much more expensive and the conversion efficiency is not good.

Larry
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Old 02-28-2015, 06:42 PM   #5
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+1 on Vsheetz except for the controller. I suggest the Bogart PWM SC-2030 along with its companion 2030RV battery monitor. Together, they would make the most of your limited solar wattage and give you a detailed battery charge status.

SC-2030 Charge Controller
With temp sensor.

Trimetric 2030RV Battery System Monitor
With 500 amp shunt and cable.


BTW, those grp 24 batts could be easily replaced by 2 6v golfcart batts in the future. This would increase your amphour storage (~2x85ah vs ~200ah).
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Old 03-01-2015, 11:38 AM   #6
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Thanks to all for the advice. Think I will go with Bogart; waiting for 2030 v2.2 to come out.
BendOR-have 2xT-105 in our 5ver in batt compartment, but on the travel trailer the batteries are mounted (as usual) on the trailer tongue. No room for GC-2 golf cart batts as they are wider and taller than the 24's.

One more question: are there any issues with mounting the 500A shunt to the frame rail under the trailer? Should I mount it on the frame rail in a 2-gang metal box to protect from road grime?
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Old 03-01-2015, 11:57 AM   #7
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Wouldn't be a bad idea to enclose the shunt. You should mount as close to the battery as possible, the frame rail is fine.
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Old 03-01-2015, 12:21 PM   #8
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Probably want to go at least 6"x4"x2 for the neg side and another 4x4x2 for the pos side.

The neg box would contain a buss bar to attach all hotel service, controller and converter neg wires now going/coming to your batts. The box would also contain the shunt, connect it too to the bar. Then you have 1 fat wire to the batt neg. Also, the shunt's monitor cable needs to go to the interior.

Consolidate the pos hotel service, controller and converter wires in the smaller box in a like manner with 1 fat wire to the batt pos.

Put the boxes side-by-side so the shunt's pos wire can be routed over.

A larger box can be done on the pos side if you want to add a master switch and catastrophe fuse.

See my pic's on a slightly larger scale with 1 big box:

http://www.irv2.com/forums/f50/batte...2s-236227.html

Good luck!
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Old 03-01-2015, 07:33 PM   #9
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I was going to mount my shunt on the frame in a 4x4x2 box, but decided to rewire my SOLAR/Battery... wiring and mounted everything in our front storage area on a piano hinge so I can swing it out to check things and work on them. So far so good.

One picture is in Travel position the other is in the maintenance position.

Don
Attached Thumbnails
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Name:	New SOLAR-BATTERY Center - Maintenance Position.jpg
Views:	591
Size:	161.2 KB
ID:	87504   Click image for larger version

Name:	New SOLAR-BATTERY Center - Travel Position.jpg
Views:	380
Size:	213.6 KB
ID:	87505  

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Old 03-01-2015, 07:44 PM   #10
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Quote:
Originally Posted by Mustang65 View Post
I was going to mount my shunt on the frame in a 4x4x2 box, but decided to rewire my SOLAR/Battery... wiring and mounted everything in our front storage area on a piano hinge so I can swing it out to check things and work on them. So far so good.

One picture is in Travel position the other is in the maintenance position.

Don
Well done. Mine is sure not that neat or labeled...
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Old 03-02-2015, 07:58 AM   #11
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Quote:
Originally Posted by Mustang65 View Post
I was going to mount my shunt on the frame in a 4x4x2 box, but decided to rewire my SOLAR/Battery... wiring and mounted everything in our front storage area on a piano hinge so I can swing it out to check things and work on them. So far so good.
Don
Pretty!
Heck, you still have enough space in the area to put in a cot.

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