Northern Tool 45 Watt Solar Power Kit

General Discussion about almost anything Teardrop or camping related

Re: Northern Tool 45 Watt Solar Power Kit

Postby bdosborn » Sat Mar 15, 2014 10:20 am

mikeschn wrote:Bruce,

At 420 watts, how long does it take you to recover from a half empty battery?

Mike...


I've never discharged down past 40 amp-hrs on 230 amp-hr golf cart batteries. The most I've harvested in a day is around 75 amp-hrs, running two fridges, fan, TV, etc on a hot day. I could probably get more but 120 watts of the PV is portable panel and I clip the MPPT controller output when I run both the rooftop and the portable PVs through it. I'm too cheap to buy a bigger controller and I'm always 100% charged at the end of the (sunny) day anyways.

Since a single 12V battery is around 105 amp-hrs, I could easily charge a half empty battery in a day.

Bruce
2009 6.5'X11' TTT - Boxcar
All it takes is a speck of faith and a few kilowatts of sweat and grace.
Image
Boxcar Build
aVANger Build
User avatar
bdosborn
Donating Member
 
Posts: 5596
Images: 806
Joined: Wed May 05, 2004 11:10 pm
Location: CO, Littleton

Re: Northern Tool 45 Watt Solar Power Kit

Postby Woodpecker » Sat Mar 15, 2014 10:44 am

While I was researching Solar I found out it's about $2 per watt for a good panel.
Do not cheap out on the panel, make sure it's good for direct and indirect lighting.
A good panel will last 20 years, a cheap one maybe 2, it'll be bigger and do less. It's worth the money, IMO, to buy the good panels.
I ended up with 3 x 200 watt panels that are 4' x 2' and cost $200 each from Renogy on ebay. I got a 3 panel kit with a matching controller.
Controllers come in 2 flavors. Bypass and shut off. A shut off controller just turns off the charge power when the batteries are full. Easy to hook up and use.
Great for solar panels but not for windmills. A bypass controller shunts the excess power off into an element like a light or heater.
I had mine running into a 55 gallon water barrel as a water heater. It's a must have for wind generators but a waste of money for solar panels.

Lastly, batteries! Batteries, batteries, batteries. The best system in the world will starve without good storage batteries.
I have 8 x 6 volt, 210 amp AGM batteries. They are huge and heavy but I can run my entire full size RV off them for 3 days from a full charge.
I lived for 6 months running off nothing but the solar with a very small sun window. Without those batteries I never would have made it.
I bought 2 wind generators but there was no wind in the forest =)
User avatar
Woodpecker
Teardrop Master
 
Posts: 124
Images: 186
Joined: Mon Dec 30, 2013 6:11 pm

Previous

Return to General Discussion

Who is online

Users browsing this forum: No registered users and 8 guests