by ReverseEngineer » Mon 26 Jan 2009, 19:16:00
$this->bbcode_second_pass_quote('patience', 'C')ar batteries won't get it. In a deep cycle application they will die quickly. Put some $ into some good deep cycle batteries, and a good charge controller. Get this up and running NOW, or you'll be sorely disappointed when you find out there are a lot of missing/dysfunctional parts. The system needs to have all its' parts sized to suit each other, or it doesn't work for crap. Way up north, the batteries can freeze outdoors (and burst open), so find a warmer place for them, and VENT the hydrogen gas evolved when charging. Lots to know about this to be functional on an enduring basis. Learn your loads, and size your system to suit, to keep the battery discharge level to less than 50% discharge at worst, 20% if you want long battery life.
You could put 2k to $5k in this easily, to get a modest sized system going. I spent about $12k just for parts, and it is a very minimal system for our useage--freezer, fridge, communications, and lights, with an occasional fan in summer.
edit to add: Here's a link to FAQ's about batteries. This site has a forum for newbies and advanced practioners:
Deep cycle batteries
The juice I use is minimal, I run a couple of 20 watt flourescent bulbs my laptop and the fridge. Obviously, at this time of year I don't really need to use the fridge, and I also have a couple of thermoelectric coolers which use very little juice.
The beauty of car batteries is they come basically free. Although 1 isn't as good as a big marine deep cycle battery, 5 of them in parallel actually last longer than one big one, and I can always get more from junked cars. I currently have collected up 8 from different folks off old cars sitting doing nothing anyhow. 5 bucks each

Anyhow, if I have to go off the grid for good, the system could use improvements obviously, but right now it can keep my laptop running for a week even on cloudy winter days.
It sounds like you run a fairly complex system that hooks into your house wiring. I just hook one of my 250W inverters up to the batteries and plug my lights and computer into that and I'm good to go for a nice long tapping session writing Doom into the wee hours
Reverse Engineer