Advanced High Power Solar Group


Advanced High Power Solar Group

You've advanced beyond the entry level kit or maybe you want to give 24 volts a try. This is the place to talk about the more advanced aspect of DIY solar.

Members: 65
Latest Activity: Jul 23

Discussion Forum

12 volt corn row bulbs

Started by Lee Hamrick. Last reply by Johann Jul 23. 3 Replies

Is anyone using the 12 volt corn row type bulb with there solar power? I ordered a couple just to see what they are like. Boy are they bright. I got one of the warm white and one of the cool white.…Continue

Multiple controllers, one battery bank

Started by Us Offgridgeeks. Last reply by Us Offgridgeeks May 1. 14 Replies

So, after following online advice about running more than one controller into the same battery bank (parallel), I have found out that the reality is that you don't want to do this...We started with 6…Continue

MPPT Charge Controllers over 40 Amp

Started by Us Offgridgeeks. Last reply by Us Offgridgeeks Sep 25, 2014. 11 Replies

Hello again.I'm stumped and hope some can share some light...I presently have 2 250watt panels feeding a Tracer 40 amp MPPT controller.On a sunny day I end up with about 77 volts coming in from the…Continue

Any Ideas For Roof DIY Tilt Bracket Design or Oulet For Parts?

Started by Joseph Lypowy Dec 23, 2013. 0 Replies

After starting out with two HF panel kits I decided to start collecting regular 100w panels on my roof because they are more efficient. On my first panel last year I made a tilt bracket system to get…Continue

Comment Wall

Comment by Dale Marshall on March 20, 2013 at 10:16am

Big Thanks out to Ray for Starting this Group today. Also if anyone has any question regarding to what alot of Phrase as " Go Big or Go Home " In the Solar world , For free to ask . I will try to answer most of your question. Anytime you Introduce Higher Voltages and more power to your Solar Electric systems you need to be careful and have alot of precautions in place for safety. Also have understanding of MPPT charge controllers and wire sizing helps also.

Comment by Renewable Ray on March 20, 2013 at 10:18am

Thanks for the suggestion Dale, this was long overdue.

Comment by Josef Appell on March 20, 2013 at 11:55am

Sunnyboy 700US here, with three 250 watt mono panels.

Stand alone solar generator with 90w mono, a 20amp programable (Chinese) MPPT, and a 40AH Valence lithium battery feeding a Xantrex SW1000.  I started with an East Penn 92AH AGM, but the lithium out performs it.

Have one of those Xantred modified sine wave units with SLA battery's (just sitting on a shelf), and it is a joke... save your money and build your own like I did.

Comment by Dale Marshall on March 20, 2013 at 12:52pm

Nice Deal on Sunny Boys 700US...I am considering use of those later in the Future.

Comment by Mike Koval on March 20, 2013 at 6:15pm

Hi all thanks for the invite to the "advance" solar forum  

4 145watters

2 100 watters

18 15 watters

2 gti's

1 rogue 3024

6 230 ah batteries

all 24 volts in 12 out

multiple fuses and breakers


Comment by Ron Green on March 20, 2013 at 7:16pm
Thanks for the invite!
(8) 145w
(4) 120w
(11) 15w
(1) Rogue 3024 48v to 12v
(1) Midnite Classic Lite 150 90v in 12v out
(6) 460ah batteries (agm)
(1) BLS battery lifesaver
(2) Everstart Marine batteries
(1) 3000w Inverter
Multiple breakers and fuses in system.
Comment by John Valente on March 20, 2013 at 7:24pm
Hi all,
I don't know if I'll ever fully understand MPPT controllers although I am approaching the point of needing one, along with a true sign wave inverter. Right now I have the following:
Sunforce 30 amp controller
3 145 watt panels
4 6 volt golf cart batteries

I also have 2 harbor freight kits (6 panels and 2 controllers.

What I need to learn:
MPPT Controller; What does it actually do, in laymans terms
Pure sign wave inverter - does it make whatever you're running off the battery supply run longer?

This year, the plan is to add at least two more 145 watt panels, 2 to 4 more golf cart batteries and a new controller as the current 3 145 watt panels that I have max out the 30 amp controller I presently have.
Comment by Josef Appell on March 20, 2013 at 7:42pm

Your electronics were designed to run off pure sine wave.  Some can actually be damaged by modified sine wave, especially anything with a speed control.  I asked the appliance repair man at the store where I bought an Energy Star refrigerator if it could be run on modified sine, and he said it would take out the compressor, and void the warranty.  (So, yes, it will make it "run longer" than with modified, but the same as if plugged into the grid.)  On the other hand, pure resistive loads like a coffeemaker will work fine on modified sine.

As for MPPT, although not necessary, it will yield more wattage from your panels, as it adjusts for the maximum tracking curve.  It is well worth the extra price, and the more watts you have, the quicker the payback.

For your new controller, you may want to get one that allows you to set your bulk, absorb, and float voltages so that you can match your battery specs.  If you don't do all three completely, your batteries will not last as long.

Comment by Dale Marshall on March 20, 2013 at 7:49pm

MPPT charge controllers are basically the best thing to use in Higher Voltage and wattage systems. Its track the highest voltage it can use and basically squeezes the most out of your Solar panel power Production.  A good example would be if you have a 100 watt panel and connect it to a PWM charge controller you will see at most maybe 50-60 watts because it directly connects to the battery when charging and connects the panel direclty, So the voltage will drop down to the Batteries Voltage point.  MPPT doesnt do that it track the highest voltage and charges with highest currents it can charge with, In most cases you can get between a a 20-40 % increase in charging power. With MPPT that 100 watt Hooked to a PWM again getting only 50 - 60 watts charge, The MPPT charge could be almost 85-90 watts instead.

Comment by Steve Peterson on March 21, 2013 at 12:37pm

I'm not sure I qualify to be in this group yet but I have plans to add more solar power and a bigger battery bank.


4 145 watt
5 60 watt
3 50 watt
6 15 watt

2 gti's

3 30 amp Net Meter  CC's

Bank 1 - 3 115 ah Deep Cycle marine

Bank 2 - 4 18 ah sealed lead acid(free) used for 12v lighting, not deep discharged

400 watt micro Xantrex inverter

Xantrex ProWatt 1000 PSW inverter

Thanks for making this new group!



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