Consider getting a NiMH battery pack. 12v, 10ah, 4lb, about $100, $140 with charger
12V Battery Packs from 10Ah to 52Ah
This is just one of a number of suppliers. Prices are fairly consistent.
If you pull up to shore power
every night you are good to go. If not then you will want a solar
panel. The problem with that is the charging
. A NiMH charger
panel feed runs about $250. What I would do instead is get a cigarette lighter inverter
($30-70 for 75-150w) to feed the standard charger. So the setup would be:
The extra step in the middle will decrease potential efficiency in exchange for cost savings. Given that NiMH charges more efficiently than lead-acid batteries of any type, you will be even or perhaps a bit ahead.
Given the standing rule
of thumb that 25% of panels
rated watts is what you can expect in amp-hours I would get 40-45w of solar panels
for one battery pack and 75-90w for two packs. With more than 2 packs you want to think about getting a multichannel charger.
Because of the differing chemistry NiMH batteries can be discharge down to 100% DoD vs 50% for LAs. 80% DoD will probably increase the number of cycles you get significantly.
That covers the supply side.
On the demand side of the system:
House lights need to become LED or florescent.
Running lights for sailing need to be LED. The best deal I have found is:
Misc: NASA Marine Instruments
I do not vouch for its durability, or it meeting minimum brightness requirements. It combines a Tricolor and an anchor
light and draws about 0.2a. Price
is about $250 in the US.
Motoring presents a problem. The best situation is that your motor
has a generator
and you run normal incandecent running and steaming lights. If not then you need to think about LED running and steaming lights and maybe the tricolor is not such a deal.
If you really are just running the minimal lights, one pack with a solar panel will get you along. If you toss in a VHF
, or FM radio
, you'll want 2. A CD player or fans will push you still higher.