We were never totally sold on doing solar power right away, but after a few days in Salmon ID, we made the decision to move forward with the project now, not knowing when we'd get another chance to be in one place and have a spot to work on the vehicle for longer than a few days. The truck batteries and alternator run on a 24v system, but after some thinking and some great advice from the forum folks at real4x4forums.com, we chose to run a 12v system for the house. This will let us run a greater selection of domestic US 12v accessories, as well as use a larger amp hour (versus larger volt) battery bay.
The Pinzgauer alternator is strongly built but not terribly large. It pushes around 35 amps at 28 volts when its running well, and it charges a dual battery bank that allows for a 24v starter to turn over the engine. Our battery bank is going to run a 24v Samlex America 300 Watt Pure Sine Wave Inverter. The inverter isn't as big as it could be, but we like the brand and the build quality. The very traveled van dweller Glen of tosimplify.net uses his to power a mobile saxophone recording studio (but his inverter is WAY bigger!!!! Buy the right sized inverter!).
The inverter transforms 24v of DC current to 110v of AC current to power what is probably the coolest piece of hardware we bought this week, a NOCO Genius GENM2 8 Amp 2-Bank Waterproof Smart On-Board Battery Charger. The NOCO charger will keep a 12v bank of batteries (probably around 2x100ah) topped up while the engine is turning. The battery charger can be ran by shore power, if need be, but won't be the only, or even the major source of house charging capacity.
The house batteries will primarily be charged by 2x100 watts of RENOGY® monocrystalline solar panels. The solar power will run through a handful of 12 gauge cables and then through a mid-range RENOGY® ViewStar 20 Amp Negative grounded PWM Charge Controller with LCD Display. This will provide the majority of the power coming into the house battery bank, and we will (hopefully) be able to cheaply build a tilting panel mount to maximize solar power when we park correctly in multi day damp spots.
More to come later. We'll show you the a basic wiring diagram, some mounting solutions, and hopefully give a shakedown report in the coming weeks!