Anyone bought solar panels lately? - Page 2 - Motorhome Forums, Motorhome Discussion, Motorhome Chat

User Tag List

 6Likes
Reply
 
LinkBack Thread Tools
post #11 of 17 (permalink) Old 17-04-2015, 23:26
Member
 
Join Date: Sep 2012
Location: newtownards
Posts: 97
Thanks: 0
Thanked 0 Times in 0 Posts
Hi.there seems to be a lot more poly than mono panels on eBay since than the last time I bought some.
Is it worth searching out the mono ones and maybe paying a bit more or would the poly ones do the job?
I will need a panel about 100-140w..
Thanks.
steven2002 is offline  
Sponsored Links
Advertisement
 
post #12 of 17 (permalink) Old 18-04-2015, 08:58
Senior Member
 
listerdiesel's Avatar
 
Join Date: Aug 2012
Location: Rushden, Northants
My Motorhome: Mercedes 614D
Posts: 6,846
Thanks: 46
Thanked 265 Times in 244 Posts
Personal Aire
My preference has always been Monocrystalline as already stated, but the Polycrystalline panels seem to be working OK and prices are cheaper, so maybe time to rethink my preferences.

Peter
listerdiesel is offline  
post #13 of 17 (permalink) Old 18-04-2015, 09:42
Senior Member
 
WildThingsKev's Avatar
 
Join Date: Dec 2009
Location: Cornwall
My Motorhome: Rapido 7090
Posts: 1,553
Thanks: 24
Thanked 61 Times in 55 Posts
Personal Aire
A 100w panel is a 100w panel whether mono or poly. I have a 5 year old 80w poly panel with an efficiency of just 12.6% so I just looked up a couple of "better" 80w mono panels expecting them to be considerably smaller. The best I could find was over 17% efficient so was it massively smaller? Nope, about 12% smaller when you would expect it to be over 30% smaller, and it was only 0.5kg lighter. Most were the same size.

Is it just low light conditions when they are better?

Kev

Canoe & Kayak manufacturer/retailer
WildThingsKev is offline  
 
post #14 of 17 (permalink) Old 19-04-2015, 13:00
Member
 
Join Date: Sep 2012
Location: newtownards
Posts: 97
Thanks: 0
Thanked 0 Times in 0 Posts
Thanks peter and kev.
I will get up on the roof and measure up. Thanks again.
Steven.
steven2002 is offline  
post #15 of 17 (permalink) Old 19-04-2015, 22:32
Member
 
Join Date: Sep 2012
Location: newtownards
Posts: 97
Thanks: 0
Thanked 0 Times in 0 Posts
Right I had a look on the roof,not a lot of space but enough to do.so then do I fit a 100w mono for £80 or a 120w poly for £90. Friendly green giant sells both including northern Ireland postage.
Thanks.Steven.
steven2002 is offline  
post #16 of 17 (permalink) Old 31-03-2016, 14:29
Junior Member
 
Join Date: Jan 2010
Posts: 4
Thanks: 0
Thanked 1 Time in 1 Post
I have 2 semi flex panels. One 50 watt and aluminium backed that is OK after 27 months.
Another 100 watt and plastic backed. Purchased from RENYTEK via Ebay It has degraded by 50% after 13 months. Renytek have been singularly unhelpful apart from asking me if I wished to purchase another similar panel !! I declined their offer in no uncertain terms. Its a bit pot luck but I would avoid RENYTEK.
berwicklaw is offline  
post #17 of 17 (permalink) Old 31-03-2016, 15:49
Senior Member
 
Join Date: Aug 2013
Location: Costa Blanca North, Spain.
My Motorhome: 2001 Benimar 6000sl on Ducato 2.8JTD
Posts: 1,254
Thanks: 4
Thanked 39 Times in 31 Posts
Quote:
Originally Posted by steven2002 View Post
Right I had a look on the roof,not a lot of space but enough to do.so then do I fit a 100w mono for £80 or a 120w poly for £90. Friendly green giant sells both including northern Ireland postage.
Thanks.Steven.

My suggestion would always be to fit the biggest capacity one that you can.

In practice the real-world output of these things is only a tiny fraction of their rated "perfect conditions, on the equator, sun exactly overhead, not a cloud in the sky etc etc".

You can't overcharge by having a bigger wattage solar panel, as the voltage regulator between it and your leisure battery simply switches off the flow of electricity to that battery once it's full anyway.

So if you've got room for a 120 watt rather than 100 watt, it's the 120 watt one that I'd get.
TheNomad is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Motorhome Forums, Motorhome Discussion, Motorhome Chat forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome