Hi Doug
As an specialist in off-grid and appropriate technology infrastructure, I'm somewhat experienced with solar systems.
First you need to know your needs, and if you can adapt your consumption in any way for better economy, or as I prefer to see it, making for a more portable system.
Second, what other factors are there? Are you looking to have battery storage indoors, outdoors or in a well ventilated space?
Do you have any preference for Lithium Ion or Lead-acid? Or even Edison batteries? Space or wight limitations?
Are you looking at primarily running applications on AC or DC? 120 or 230V nominal ac? How much load would you use for respective current type? Does your equipment require a pure sine-wave inverter?
Since you might want to avoid some critical systems blacking out if an inverter fails or fuses out, you might want to run things like phones, radios, other battery chargers, strategic lights etc, on a DC circuit.
How and where are you planning on mounting the panels? How many sun hours does your area get? (There are services online for finding it out for your local spot.)
What are your climate factors? In hot weather panels need better air circulation (higher brackets), in very cloudy or mobile applications, mono-crystalline thin film PV's are preferred, as they performs significantly better under lower light intensity, and are insensitive to partial shading. Traditional poly-crystalline PV's have slightly higher top performance and typically takes up slightly less space.
Don't forget to include cables, PROPER fuses and connectors, in your costing, and use a cable diameter vs. length calculator to make sure you don't use too thin cables. With DC it is imperative that you don't underestimate the importance of this step, since seemingly unimportant extensions can critically overload a DC cable, resulting in cable fire and/or costly short-outs.
For example, for my own plans, an ultra-light bicycle camper-trailer/rolling tech-nomad lab, I got me 3x100W Fuji mono-crystalline thin film roll-up panels, with a very high voltage, as to charge high voltage lithium packs and electric pedal assist drive system for the bike (recumbent trike), using upwards 50VDC and 500W, saving me a bulky step up device, but steps down easily to 12VDC for other applications. Sans battery the whole kit weighs under 7kg. I have thus far hacked everything to run on DC, and most things has it's own battery, so I have no need for any inverter.
« Last Edit: December 31, 1969, 05:00:00 PM by Guest »
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