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Re: 12v DC to 115v AC for boiler pump
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Posted by jdemaris on December 31, 2006 at 14:48:15 from (66.218.12.38):
In Reply to: Re: 12v DC to 115v AC for boiler pump posted by RP2 on December 31, 2006 at 13:11:11:
Yes - correct. This stuff makes my head hurt unless I'm really in the mood to study it - and make use of the knowledge while its fresh in my mind. If I'm thinking about fixing tractors, the electrical stuff takes a back seat in some dark corner of my brain. Watt-hours = AH X Volts. So of course, two Trojans in series does not increase AH but does double the voltage.
Also, I wasn't suggesting he needed anything that size - I have no idea what he has in mind or wants. When designing an off-grid household system - keeping batteries from getting overly discharged is an imporpant factor - so proper sizing is very important. In his situation, since he has grid-power - he could size his system very small. Problem is though, the equipment is expensive regardless. I haven't seen a system yet that will ever pay for itself - not even when installed along with a 60% cash incentive package from the State. With a large solar-system, the benefit of independence is usually the payoff. But, to qualify for a State cash incentive - Grid-tie to the power-company is just about always a requirement. And, most hook-ups done with grid-tie cannot be used - at all - when the power is down. Makes no sense to me and offers little to no "independence."
I just got done building a grid-tie system with battery-backup and the ability to function when the grid is down. It costs a lot of extra money and I'm not sure it's worth it. But, I consider it a lifetime investment - and if I ever move, all the solar equipment is coming with me.
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