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Old 11-27-2014, 03:16 PM   #15
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Agreed!


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Old 11-27-2014, 09:21 PM   #16
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Having converted two previous Airstreams and a big Moho to all LED lighting, I can easily do what I like to call, "an engineering experiment" and have no hope of receiving a pay-off on my investment. To get 300-400w output has approximately what kind of cost?
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Old 11-27-2014, 09:27 PM   #17
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It's more than the panels, it's the wire, battery storage, and power regulation..... The sky is the limit, or a few hundred using eBay Chineesium!
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Old 11-28-2014, 12:34 AM   #18
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Cool Solar and Systems Engineering (SE)

I must say that this is an awesome thread.

I do agree on the smaller panels really being there for battery maintenance. Storage is not always as convenient as the driveway or side yard, so bringing the TT home for a monthly charge is a lot of effort. With a solar small panel, hook it up when you park, and batteries are full when you come back for the next trip. If that is the system requirement then the design complies.

The next level(s) are where the systems engineering come in. It depends upon what the system requirements are, and where all the constraints can be considered.

The first requirement is trouble free operation and why many love solar. No genset to lug around. Flip an inverter switch and fire up the espresso maker etc.

The power requirement is next, Atomic13 runs all usual hookup loads on panels and battery when sun is up, It's wonderful to be able to do it.

Constraints reduce the power available, and this is where probably most solar folks end up: space claim on roof; battery capacity; battery mass and system cost. Most are constrained to 2 24 or 27 series lead acid on the tongue. This sets a minimum limit on panel capacity of about 240) wats for summer (which is how I sized my system). I'm not yet limited by roof space claim.

The combinations are endless, depending upon what you want to do, with the constraints in place - and it's awesome that folks bring their solution to this forum. 1.7kw!!!! Cooll!
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Old 11-28-2014, 06:39 AM   #19
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Having converted two previous Airstreams and a big Moho to all LED lighting, I can easily do what I like to call, "an engineering experiment" and have no hope of receiving a pay-off on my investment. To get 300-400w output has approximately what kind of cost?
Having a Master's Degree in Systems Engineering with special emphasis in EE, it comes in very handy when designing a solar charging regimen. PM me if you would like the complete details of said charging system.
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Old 11-28-2014, 09:29 AM   #20
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My goal is eventual 3 phase solar, just in case I want to run a welder or big air compressor while boon docking! You just never know!
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Old 11-28-2014, 12:45 PM   #21
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Interesting concept!


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Old 11-28-2014, 12:46 PM   #22
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Why not use a 48VDC system and a compatible DC-direct welder?


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Old 11-28-2014, 12:51 PM   #23
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And for those that would like to have very large battery banks but don't want to carry the additional weight, the next generation of lithium batteries, lithium, iron, Yttrium, phosphate (LiFeYPO-4) are almost ready for prime time.

This new formulation addresses some of the previous problems with the prior generation of LiPo batteries and will be a plug and play installation, just like liquid lead acid or AGMs are presently. All of the benefits of LiPo technology like deep draw capability (80%), extremely long life (5000 charge cycles = 10-15 year battery life), and the ability to charge at below freezing temperatures.

These new beauties are being field tested now and should be available sometime in the first quarter of 2015.
Found these for sale: LifeYPO4
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Old 11-28-2014, 02:41 PM   #24
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Upgrade

This my upgrade from 40 watts that I had and did not do the job.
I now have a 190 watts that get the job done very well
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Old 11-28-2014, 02:53 PM   #25
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My goal is eventual 3 phase solar, just in case I want to run a welder or big air compressor while boon docking! You just never know!
A bank of solar panels,3 inverters one for each phase should get the job done along with some 120v AC batteries to store all the extra power and stop any surges.
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Old 11-28-2014, 04:37 PM   #26
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Kidding of course, don't do much welding on the road!
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Old 11-28-2014, 06:36 PM   #27
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Kidding of course, don't do much welding on the road!
I have a friend who is a wandering RV tech and runs a semi (small Freighliner) pulling a gimormous 5th wheel. He uses a 24VDC welding apparatus directly from his chassis batteries (also 24VDC) when his diesel is on high idle. Works like a charm.....so it's totally do-able!!!!
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