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 > Not solar again ?

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Gdetrailer

PA

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Posted: 12/03/21 08:59pm Link  |  Quote  |  Print  |  Notify Moderator

CA Traveler wrote:

BFL13 wrote:

Solar on the truck and move some of the batteries from whichever trailer is in use to the truck during the day to get recharged somewhat. Put the batts back in the evening. Move the other batts to the truck next day for their turn at some solar.
Sounds like fun - [emoticon]

I'd opt for a very small gen. [emoticon]


Or just stay home?

My hats off to folks that want to camp/live/work without commercial power and be willing to go to all of this backbreaking work shuffling panels, wires, controllers and yes hundreds of pounds of batteries.. You guys put way to much work into camping, I would rather put that energy into sitting back in my camp chair sipping on my favorite beverage enjoying watching other folks labor..

If I was in this situation with three different trailers all needing some means of charging I would personally dump the single one panel array idea on the back of a truck.

Instead put the (invest) money into enough panels to populate each RV reasonably well enough to to help assist with charging. Then fill in any additional charging with a portable gen. Solar is reasonably inexpensive now days, 100W 12V panels often can be had for $80 each new.. So, you invest $320 in 4 100W panels for each trailer, install on the trailer off and be done with it.

Expensive up front? You bet.

Much easier to deal with? You bet.

Less backbreaking work?, You bet.

Less chance of something stupid happening like connecting things backwards or forgetting to disconnect wiring before moving the truck or someone snagging your wire damaging your panels and wiring with a bicycle, motorcycle, quad or just walking through your site? You bet.

valhalla360

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Posted: 12/04/21 12:58am Link  |  Quote  |  Print  |  Notify Moderator

CA Traveler wrote:

BFL13 wrote:

Solar on the truck and move some of the batteries from whichever trailer is in use to the truck during the day to get recharged somewhat. Put the batts back in the evening. Move the other batts to the truck next day for their turn at some solar.
Sounds like fun - [emoticon]

I'd opt for a very small gen. [emoticon]


The idea is good but easier to just set it up so you can merge the battery banks easily by connecting a cable.


Tammy & Mike
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PerryB67

Lanesboro, Minnesota

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Posted: 12/04/21 11:35am Link  |  Quote  |  Print  |  Notify Moderator

CA Traveler wrote:

400W of solar suggests 30A. Parallel 12V panels would require large wire to the controller vs serial panels at about 8A. For the OPs application 10 ga wire at 8A would be ideal, maybe even 12 ga. There are tradeoff factors for any installation.
A Renogy Compact or HQST 100 watt panel only has an IMP of 5.3 and a Renogy Eclipse 5.7. So even with four Eclipse panels you'll only get 22.8. We have 465 watts of solar on our roof (three 100 watt Renogy Compact panels and one 170 watt GoPower) and yet when I run the numbers using either Will or another site (can't use affiliates) both have my amps at 25 in parallel. We use 10 awg and it works just fine. Our roof is full though. If there was more room, plan to add panels in the future, and keep with parallel, I'd go with 8 awg.

Enjoy,

Perry

* This post was edited 12/04/21 04:08pm by PerryB67 *


2018 Escape 5.0
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GoPower 170 watt, and three Renogy 100 Compact watt panels, all in parallel
260 ah Soneil SiO2 batteries


CA Traveler

The Western States

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Posted: 12/05/21 03:07pm Link  |  Quote  |  Print  |  Notify Moderator

Perry, I agree and 500W tends to be the point to give more consideration to serial for wiring loss. Serial advantages for me: Less cost with 24V panels, didn't want to upgrade later, less roof space and easier installation. With my 3 serial panels I have 64' of 10ga with extremely low loss due to the increased voltage and lower amps to the controller. Another factor is serial panels with bypass diodes which most panels have results in better shade tolerance than parallel.

My 750W serial 24V panels with MPPT controller cost $100 more than parallel 12V panels with PSW controller in 2014.


2009 Holiday Rambler 42' Scepter with ISL 400 Cummins
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Bob


PerryB67

Lanesboro, Minnesota

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Posted: 12/06/21 06:13pm Link  |  Quote  |  Print  |  Notify Moderator

CA Traveler wrote:

Another factor is serial panels with bypass diodes which most panels have results in better shade tolerance than parallel.
Why would you have better shade tolerance in series than parallel. Nearly as good, or as good, but I don't see better, Then again, sometimes I need to be educated.

Enjoy,

Perry

StirCrazy

Kamloops, BC, Canada

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Posted: 12/07/21 06:38am Link  |  Quote  |  Print  |  Notify Moderator

PerryB67 wrote:

CA Traveler wrote:

Another factor is serial panels with bypass diodes which most panels have results in better shade tolerance than parallel.
Why would you have better shade tolerance in series than parallel. Nearly as good, or as good, but I don't see better, Then again, sometimes I need to be educated.

Enjoy,

Perry


the higher voltage at the controler has something to do with it. I even find this with my 24V panel in my camper. at 7am I will be getting between 0.5 and 1 amp of charge out of the 325 watt 24V panel but my 480 watt panels (12V's in parralel) will be putting nothing out for another hour at least. so low light/shading get better preformance as the voltage that does come through is high enough to start the charge. A MPPT charger is an important part of this equasion also in my opinion.

* This post was edited 12/08/21 09:23am by StirCrazy *


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pianotuna

Regina, SK, Canada

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Posted: 12/07/21 07:03am Link  |  Quote  |  Print  |  Notify Moderator

PerryB67 wrote:

CA Traveler wrote:

Another factor is serial panels with bypass diodes which most panels have results in better shade tolerance than parallel.
Why would you have better shade tolerance in series than parallel. Nearly as good, or as good, but I don't see better, Then again, sometimes I need to be educated.

Enjoy,

Perry


Perry Unisolar made panels with diodes between every cell. Wired in series parallel, they do work in leafy shade, and in rain too.

There is one other currently made panel that has this feature--but they are from Germany and I have been unable to find a source to buy them from.

In general, parallel is better, but with a good MPPT controller more watt-hours may be harvested.


Regards, Don
My ride is a 28 foot Class C, 256 watts solar, 556 amp-hours of Telcom jars, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

PerryB67

Lanesboro, Minnesota

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Posted: 12/07/21 08:36am Link  |  Quote  |  Print  |  Notify Moderator

StirCrazy wrote:

the higher voltage at the controler has something to do with it. Ieven find this with my 24V panel in my caper. at 7am I will be fetting between 0.5 and 1amp of charge out of the 325 watt 24V panel but my 480 watt panels (12V's in parralel) will be putting nothing out for another hour at least. so low light/shading get better preformance as the voltage that does come through is high enough to start the charge. A MPPT charger is an important part of this equasion also in my opinion.
Read my post again. I find I'm getting what your talking about with today's modern panels.

I also have a Victron 100/30 SCC, so that's a moot point.

pianotuna wrote:

Perry Unisolar made panels with diodes between every cell. Wired in series parallel, they do work in leafy shade, and in rain too.

There is one other currently made panel that has this feature--but they are from Germany and I have been unable to find a source to buy them from.

In general, parallel is better, but with a good MPPT controller more watt-hours may be harvested.
So the panels you're talking about are unobtainium. I'm talking about current panels, that are easily obtained, that the sales person at Northern Arizona Wind & Sun recommended because of their superior light gathering ability.

Again, I already have a quality Victron 100/30 SCC.

Enjoy,

Perry

PerryB67

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Posted: 12/07/21 08:37am Link  |  Quote  |  Print  |  Notify Moderator

Duplicate post removed.

pianotuna

Regina, SK, Canada

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Posted: 12/07/21 09:52am Link  |  Quote  |  Print  |  Notify Moderator

Hi Perry,

The Victron 100/30 SCC is an excellent choice.

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