100 watt solar panel

Hi,

Not much difference in price to go to #10 from panels to controller. That allows for future expansion.

Almot wrote:

TucsonAZ wrote:
On a 12v system you should have some seriously thick wire being used

Not if the panel is mere 100W.

Though 100W won't do a lot of good, other than a couple of lights and small loads like LP fridge circuit and LP/CO sensors.

Worry about thick wire larger than 12 gauge from panel to controller when your amps out of the panel to the controller exceed 20 amps output. Until then... 12 gauge to the charge controller from the panels is fine.

However, I'd run 8 or 10 gauge wire from the controller to the batteries, and keep the run as short as possible, 5 feet or less. That is where it's critical to minimize voltage losses, after the voltage has been regulated and controlled. There's always surplus voltage before the controller, or should be, in your design calculations.

TucsonAZ wrote:
On a 12v system you should have some seriously thick wire being used

Not if the panel is mere 100W.

Though 100W won't do a lot of good, other than a couple of lights and small loads like LP fridge circuit and LP/CO sensors.

Well, any solar is worth having it, but RV shops are living in their own imaginary world. Take your rig and go elsewhere for solar.

Parts for 100W are commonly available for under $300 including panel, controller, nuts and bolts - everything.

Being a single low-wattage panel, it's a simple work and won't take installer more than half a day. $160-170 per hour for RV electrician job seems too steep. You should be able to find some installer to do this for $600-700 including parts and labor. You'll end up spending more time - though some installers are doing house calls.

It appears that most solar stores - AM Solar, Solar Blvd etc - keep contacts with independent installers, similarly to how hardware stores would fetch you a few phone numbers of painters, plumbers etc if you ask. Though they often have a "scratch my back/I'll scratch yours" agreement - store promotes the installer, and installer is trying to push the parts from that particular store, sometimes expensive.

Btw, 100W is way too small for fulltime boondocking. I used to do this with zero solar watts and no generator, but you might not like it. If the goal is to significantly reduce generator time, you should get at least 200-300W. With big solar arrays the parts cost under $2 per watt, including everything.

mena661 wrote:
Paying $1100 for 100W is NEVER worth it! Don't get taken!

X 1100

Not worth it. without the roof mount, going portable, full kit, I got 120 watts, controller, wires, quick connect and disconnect, for $180 at Solar Blvd. Probably the best $180 I ever spent on camping gear. Very peaceful, powers my 21 foot travel trailer just fine.

Paying $1100 for 100W is NEVER worth it! Don't get taken!

Comparison of prices for installed system with just the solar panel are informative but unfair. It may cost $1100 to buy the panel, controller, wiring, etc and have it installed. It probably includes 3 or 4 hours of labour and shop at $200 per hour. I think it is worthwhile even at that price when eliminating the need for a generator for many years. But I ordered the Renogy 100 W kit for $250 (Amazon Canada) and will have a go at installing it myself. Probably will add more collector next year.

This reminds me so much of my experience adding a sun room onto our house this year. I hired an electric company to do the wiring, though it is the trade I know most about. Cost was $1100, that's $70/hr for the man plus $20/hr for tools. After I closed up the walls I took over installing the lights and plugins myself. I should have done the whole job, just lacked confidence and worried about displeasing the inspector. Then a friend told me he wired his garage and got nothing but praise from the inspector. And this friend called me over to install a phone jack for him! You can do it if you are interested and have a source of advice like this forum.

Whoever said get dealer to prewire and finish it yourself later was right on.

You could manage without solar for a while. We can boondock without solar or generator for 4 days. No TV or microwave. Led lights.

This seems VERY high for such a small system. Read the info on AM solar website as suggested. They have a stellar reputation and have done this for years.

I am off tomorrow to get solar system #2(new rv) installed by them, You need to understand what a solar system can and cannot do for you - battery storage is a big issue coupled with how fast you can charge up the batteries. Learn before you leap.

That's way too much! I just bought eight 230w Solarworld panels at $0.69 a watt but the reality is they're going to do an inferior job on the install and wiring also. On a 12v system you should have some seriously thick wire being used or your voltage drops will make the system all but pointless. You should have a good charge controller a battery monitor and so on. For the money they want build yourself a good proper system or spend the $150 shipped for the 100w Renogy kit and do it yourself, either way you'll have a far better system than what they're offering.

Also, don't expect a ton from 100w, with a PWM charge controller you're going to get 80w top, even with 5 hours of full sun a day that's only 400 watts of power a day. You should never drain your battery past 50% so that would be enough to keep a healthy one battery system topped off or extend your boondocking but you will have to know the limitations.

I have 1,380 watts on my roof and still have to be reasonable with use.