30% federal credit for solar hot water heaters, IIRC. That "solar camp shower bag" probably would qualify as well. :-)
I've been doing the green thing for over 30 years now. Don't be fooled by the "tax credits" offered; they usually only add up to a couple of hundred dollars if anything as they can't be combined and you can only get a credit towards tax that you owe against income
you make. Some programs can be carried over up to 20 years (but read the fine print). Also, if there are any state incentives that match, you'll have to deduct that amount. And as usual there's no free lunch; most will become taxable income for the next year. I've learned to pick and choose which utility, state and federal incentives are best for my clients, depending upon the net return over the long haul. One needs to read the rules and understand the minimums and maximums. Here's some FAQs http://seia.org/galleries/pdf/SEIATa...l_v3-0_FAQ.pdf
and the IRS Form http://www.irs.gov/pub/irs-pdf/f5695.pdf
EG; a 200 watt panel from West Marine
won't make the grade as it doesn't produce enough power, the same applies to wind
turbines producing less that .5KW. For boaters, the big kick in the groin is that with many of the large state and utility incentive programs, an alternative energy investment, MUST be grid-tied and not stand alone. So, you'll need a long extension cord if you want to be grid-tied.
That said, there are monies available and the bottom line is that for boaters, energy not
produced by diesel fuel
or gasoline is a great investment and it's the right thing to do, energy credits aside.
As for the water bag "At least half the energy used to heat the dwelling's water must be from solar.", you'll need one big bag.