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100% solar powered maisonette possible?
Rank: Elder Joined: 1/8/2018 Posts: 2,212 Location: DC (Dustbowl County)
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Thitifini wrote:I once did some calculations for a 310SQM house fully on solar. Average monthly use 300-400KWh. Costa came to appx 800-1.2m for full off-grid (guided by Mr. Google). Repayment period 13-15yrs. Will try to recalculate again to post here for the gurus to critique. Now, on the borehole, planning a 150m and a friend in that biz tells me that solar pumps don't work those depths in Nbi and environs due to I don't know what (sure enoung I've never seen a solar powerwd borehole except in lower&north eastern). Can't back that up with facts, you know how engineers talk "I tell you it will not work. Lakini nitakuwekea uki-insist  " That is quite a bit of usage bro, Kwani that house has a secret factory in the garage? I would however gladly invest that amount on a 100% off the grid solar system, especially if the land is in the middle of nowhere in the dustbowl. It pays for itself many times over in terms of convenience and returns from irrigation.
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Rank: Elder Joined: 2/16/2007 Posts: 2,114
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If dustbowl is windy like those sides of Kipeto in Kajiado,you can also intall some wind turbines so that you have a hybrid system,i,e you can still charge batteries at night..The solar panels and wind turbine would be connected to single hybrid controller connected to the batteries.
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Rank: Elder Joined: 1/8/2018 Posts: 2,212 Location: DC (Dustbowl County)
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Chaka wrote:If dustbowl is windy like those sides of Kipeto in Kajiado,you can also intall some wind turbines so that you have a hybrid system,i,e you can still charge batteries at night..The solar panels and wind turbine would be connected to single hybrid controller connected to the batteries. Great tip. I think hybrid with wind would work great for Ngong. Whenever I am hapo and outdoors I always feel those wind gusts big time even from near the bottom of the valley! No wonder Kengen tapped into this precious resource there. I also see these mini windmill things on the roundabout after the "tunnel" into Kitengela which means Kitengela has wind potential. They are always spinning full speed. I wonder how much power they generate compared to solar.
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Rank: Elder Joined: 4/30/2008 Posts: 6,029
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Thitifini wrote:I once did some calculations for a 310SQM house fully on solar. Average monthly use 300-400KWh. Costa came to appx 800-1.2m for full off-grid (guided by Mr. Google). Repayment period 13-15yrs. Will try to recalculate again to post here for the gurus to critique. Now, on the borehole, planning a 150m and a friend in that biz tells me that solar pumps don't work those depths in Nbi and environs due to I don't know what (sure enoung I've never seen a solar powerwd borehole except in lower&north eastern). Can't back that up with facts, you know how engineers talk "I tell you it will not work. Lakini nitakuwekea uki-insist " I got a quote of Kshs 1.1m excluding bribes to connect my rural residence to KPLC..So in this case, the payback period is immediate and no monthly bills
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Rank: Elder Joined: 2/16/2007 Posts: 2,114
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I was at that roundabout yesterday and those things were spinning fullspeed but looks like the hybrid setup was vandalized..the solar panels as well as control panel all missing,a pithy.. MugundaMan wrote:. I also see these mini windmill things on the roundabout after the "tunnel" into Kitengela which means Kitengela has wind potential. They are always spinning full speed. I wonder how much power they generate compared to solar.
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Rank: Member Joined: 1/15/2015 Posts: 681 Location: Kenya
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mawinder wrote:Thitifini wrote:I once did some calculations for a 310SQM house fully on solar. Average monthly use 300-400KWh. Costa came to appx 800-1.2m for full off-grid (guided by Mr. Google). Repayment period 13-15yrs. Will try to recalculate again to post here for the gurus to critique. Now, on the borehole, planning a 150m and a friend in that biz tells me that solar pumps don't work those depths in Nbi and environs due to I don't know what (sure enoung I've never seen a solar powerwd borehole except in lower&north eastern). Can't back that up with facts, you know how engineers talk "I tell you it will not work. Lakini nitakuwekea uki-insist " I got a quote of Kshs 1.1m excluding bribes to connect my rural residence to KPLC..So in this case, the payback period is immediate and no monthly bills 1.1M? Go solar!
60% Learning, 30% synthesizing, 10% Debating
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Rank: Veteran Joined: 11/2/2006 Posts: 1,206 Location: Nairobi
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Thitifini wrote:I once did some calculations for a 310SQM house fully on solar. Average monthly use 300-400KWh. Costa came to appx 800-1.2m for full off-grid (guided by Mr. Google). Repayment period 13-15yrs. Will try to recalculate again to post here for the gurus to critique. Now, on the borehole, planning a 150m and a friend in that biz tells me that solar pumps don't work those depths in Nbi and environs due to I don't know what (sure enoung I've never seen a solar powerwd borehole except in lower&north eastern). Can't back that up with facts, you know how engineers talk "I tell you it will not work. Lakini nitakuwekea uki-insist " How much would you pay KPLC per month?If its say 5k,it would take you 18yrs to pay KPLC 1.1M. Is solar really cheap in this case? Formally employed people often live their employers' dream & forget about their own.
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Rank: Elder Joined: 2/16/2007 Posts: 2,114
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I would look at it this way..If the solar installed at 1.1M can supply same capacity as the KPLC..then the 5k 'saved' would take 18 years for the solar to repay itself.Now if the lifetime of the solar is say 25 years,that would be 7 years of 'free' power..(the batteries would require replacing though when they loose efficiency). bird_man wrote:
How much would you pay KPLC per month?If its say 5k,it would take you 18yrs to pay KPLC 1.1M.
Is solar really cheap in this case?
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Rank: Veteran Joined: 5/5/2011 Posts: 1,059
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Chaka wrote:I would look at it this way..If the solar installed at 1.1M can supply same capacity as the KPLC..then the 5k 'saved' would take 18 years for the solar to repay itself.Now if the lifetime of the solar is say 25 years,that would be 7 years of 'free' power..(the batteries would require replacing though when they loose efficiency). bird_man wrote:
How much would you pay KPLC per month?If its say 5k,it would take you 18yrs to pay KPLC 1.1M.
Is solar really cheap in this case?
I see solar not as a cheaper option to Kenya power but a cheaper backup option compared to diesel generator, by the way a 1.1 million solar system can power a medium household fully including any baking or jacuzzi, the good thing with solar is that you can afford to waste power eg you can even boil car washing water during the day since your batteries are fully charged by midday. Anther advantage is reliability solar in Kenya is reliable than KPLC so those blackouts will be less annoying. For 1.1 M you can go for lithium ion batteries which are more power dense. To Each His Own
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Rank: Member Joined: 1/15/2015 Posts: 681 Location: Kenya
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kayhara wrote:Chaka wrote:I would look at it this way..If the solar installed at 1.1M can supply same capacity as the KPLC..then the 5k 'saved' would take 18 years for the solar to repay itself.Now if the lifetime of the solar is say 25 years,that would be 7 years of 'free' power..(the batteries would require replacing though when they loose efficiency). bird_man wrote:
How much would you pay KPLC per month?If its say 5k,it would take you 18yrs to pay KPLC 1.1M.
Is solar really cheap in this case?
I see solar not as a cheaper option to Kenya power but a cheaper backup option compared to diesel generator, by the way a 1.1 million solar system can power a medium household fully including any baking or jacuzzi, the good thing with solar is that you can afford to waste power eg you can even boil car washing water during the day since your batteries are fully charged by midday. Anther advantage is reliability solar in Kenya is reliable than KPLC so those blackouts will be less annoying. For 1.1 M you can go for lithium ion batteries which are more power dense. Very insightful. Had factored in all HH power needs including irrigaring the lawn and hot water heaters. I think for around this sum solar is something to consider as main source with kplc as backup. What I don't know is how the pannels would look on a roof top or in the garden. I find them not very appealing to the eye esp if one has to have very many pannels.
60% Learning, 30% synthesizing, 10% Debating
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