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Farm Building and Infrastructure
Renewable Energy
Small scale solar & building mounted turbine for borehole pump
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<blockquote data-quote="Highland Mule" data-source="post: 7202269" data-attributes="member: 33090"><p>Okay, so if the pump is 0.9kW, then the most power it is consuming (assuming the sticker is close o being correct would be 0.9 x 24 = 21.6 units per day (slightly more today though, being as the clocks went back), so it's not quite as hungry as you were thinking. You can always stick a clamp ammeter on it to check if you want (Power = amps x volts), but bear in mind that if it's at the end of a long cable the voltage might be less than 240. Now you need to think where that power is going, and my bet would be mostly into frictional losses in the pipes, given that the distance is so long and pipes are narrow bore. As a rule of thumb, a wider pipe will need less push to get the same volumetric throughput. Unfortunately, the flow calculator doesn't recognise "cow" as a unit of flow, but it does feel like there's a fair bit going through it.</p><p></p><p>If you have any reason to dig up the pipe, make it a few steps bigger - for that use I'd be expecting way more than 25mm.</p><p></p><p>As to the solar demands for the existing pump, I can't offer any thoughts. You'd want a couple of days of hold-up for gloomy weather, plus auto switching grid backup, I'd expect, so maybe 50kW-h of storage? My latest car battery bought was 70A-h, I think, at 12V, so quite a bit less than one kW-h of storage. Gut feel tells me about 80 batteries, charged by enough solar to fill them in 4-6 hours, so 10+kW of panels. Doesn't feel like it's going to be easy.</p><p></p><p>All calculations done without access to fag packet, so my sums may be wrong - anyone want to sanity check them for me?</p></blockquote><p></p>
[QUOTE="Highland Mule, post: 7202269, member: 33090"] Okay, so if the pump is 0.9kW, then the most power it is consuming (assuming the sticker is close o being correct would be 0.9 x 24 = 21.6 units per day (slightly more today though, being as the clocks went back), so it's not quite as hungry as you were thinking. You can always stick a clamp ammeter on it to check if you want (Power = amps x volts), but bear in mind that if it's at the end of a long cable the voltage might be less than 240. Now you need to think where that power is going, and my bet would be mostly into frictional losses in the pipes, given that the distance is so long and pipes are narrow bore. As a rule of thumb, a wider pipe will need less push to get the same volumetric throughput. Unfortunately, the flow calculator doesn't recognise "cow" as a unit of flow, but it does feel like there's a fair bit going through it. If you have any reason to dig up the pipe, make it a few steps bigger - for that use I'd be expecting way more than 25mm. As to the solar demands for the existing pump, I can't offer any thoughts. You'd want a couple of days of hold-up for gloomy weather, plus auto switching grid backup, I'd expect, so maybe 50kW-h of storage? My latest car battery bought was 70A-h, I think, at 12V, so quite a bit less than one kW-h of storage. Gut feel tells me about 80 batteries, charged by enough solar to fill them in 4-6 hours, so 10+kW of panels. Doesn't feel like it's going to be easy. All calculations done without access to fag packet, so my sums may be wrong - anyone want to sanity check them for me? [/QUOTE]
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Small scale solar & building mounted turbine for borehole pump
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