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Preppers' Corner
Need some advice (add to safe vs add to sustain)
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<blockquote data-quote="1krr" data-source="post: 2582891" data-attributes="member: 750"><p>I'd love to hear more about your setup. Most definately a 24 volt system and if I get beyond day dreaming, I will most likely put together a 48v bank to keep the wire sizes smaller. If you've ever seen the guys at otherpower, they build a lot of 48 volt alternators. Standing up a diy wind turbine played no small part in buying unincorporated land. If 1hp is ~.75kw, a 1kw draw on the bank would be a sustained 84 amps (my pump is a 3/4 horse 220v). 1kw sustained would be in the ballpark on the DC side I would think (sound right)? Surge on a well pump like that must be a nasty 2-3x output. Our well tested out to about 20gpm so 5-10 minutes of run time a day would net 100 gallons of fresh water. I'll be honest, I've never put a meter on it when it was running so I can't saw what the current draw looks like. It's all guessing at this point. For pricing a 48 volt bank of 6 volt Sam's specials will run ~600. Panels are still coming down in price and getting under a buck a watt for panels isn't too hard these days. I am curious about your panel array (mostly what you are seeing in advertised vs output wattage). In any case, two or three ~250 watt panels should give me enough to run the pump enough to fill the water needs without other loads on it (or am I over estimating them)? Retail inverters can be had in the ~1000 dollar range that should be able to handle the pump (thinking a 220v 3000 watt samlex unit). A really well reviewed mppt charge controller is in the ~500 dollar range. Cables and connectors will add another couple of hundred (building them myself of course). </p><p></p><p>All this sounds good in theory but I would enjoy hearing about how it stands up to your experience in practice.</p><p></p><p></p><p></p><p></p><p></p><p>If I were a betting man, I would bet you were probably right. In that consideration, the solar project is as much a toy as a new AK!</p></blockquote><p></p>
[QUOTE="1krr, post: 2582891, member: 750"] I'd love to hear more about your setup. Most definately a 24 volt system and if I get beyond day dreaming, I will most likely put together a 48v bank to keep the wire sizes smaller. If you've ever seen the guys at otherpower, they build a lot of 48 volt alternators. Standing up a diy wind turbine played no small part in buying unincorporated land. If 1hp is ~.75kw, a 1kw draw on the bank would be a sustained 84 amps (my pump is a 3/4 horse 220v). 1kw sustained would be in the ballpark on the DC side I would think (sound right)? Surge on a well pump like that must be a nasty 2-3x output. Our well tested out to about 20gpm so 5-10 minutes of run time a day would net 100 gallons of fresh water. I'll be honest, I've never put a meter on it when it was running so I can't saw what the current draw looks like. It's all guessing at this point. For pricing a 48 volt bank of 6 volt Sam's specials will run ~600. Panels are still coming down in price and getting under a buck a watt for panels isn't too hard these days. I am curious about your panel array (mostly what you are seeing in advertised vs output wattage). In any case, two or three ~250 watt panels should give me enough to run the pump enough to fill the water needs without other loads on it (or am I over estimating them)? Retail inverters can be had in the ~1000 dollar range that should be able to handle the pump (thinking a 220v 3000 watt samlex unit). A really well reviewed mppt charge controller is in the ~500 dollar range. Cables and connectors will add another couple of hundred (building them myself of course). All this sounds good in theory but I would enjoy hearing about how it stands up to your experience in practice. If I were a betting man, I would bet you were probably right. In that consideration, the solar project is as much a toy as a new AK! [/QUOTE]
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