白鷹町 小水力発電 実験 2026年 第2弾
1334sugar
83,474 views
Shirataka Town Small-Scale Hydroelectric Power Generation Experiment, 2026, Part 2
We tried it out in a small house.
Target Output: 300W, 24V
The waterway itself will not be left in the water, and it will be possible to return to its original state immediately.
Generator specifications: 100W-400W at 300rpm
Considering the water volume and turbine size, 300rpm seems to be the limit.
The current equipment cannot generate electricity; it seems necessary to re-select the generator motor.
https://link.amazon/B09b7UkXd
300rpm Wind Turbine Generator, 12V 24V 48V Low RPM Alternator Permanent Magnet 3-Phase AC Alternator 100W-400W Generator
Addendum:
2026.09.07 We experimented with the generator and forced it to rotate at 750rpm with a motor.
(750rpm is from the specifications of the motor used)
It produced 100W.
The current device only rotates at 300rpm to 350rpm, so the power generation is extremely low. I will continue to investigate tomorrow to see how many rotations are needed to produce 100W. I'm recording the video and will upload it later.
2026.09.08 Results are in. (YouTube) 中華製 何回転で 発電するの？ 仕様は300rpm 第3弾
≒ 100W at 750rpm. It seems that to produce 300W, it needs to rotate at 750rpm or higher.
Unit 1: https://link.amazon/B0hIEoZMy
Unit 2: https://link.amazon/B03ZFUGLh
Unit 3: https://link.amazon/B0im7TxOH
Addendum:
2026.09.09 I bought PVC pipes to give the water more force. I also ordered a 24V 50W 250rpm generator, as generators above 50W are expensive.
This one is 250rpm and I'm trusting it will produce 50W, so I'm trying it out.
Specifications:
Output Voltage: 24V
Brand: SMARAAD Model Number: PMG165-50
Rotor Diameter: 250mm
Product Name: Disc Coreless Permanent Magnetic Generator
Rated Speed: 250RPM
Current Rating: 4A
Shaft Diameter: 25mm
Insulation Resistance:
100Mohm Min (500V DC)
Housing Material: Aluminum (Alloy)
Shaft Material: Steel
Single Package Size: 20.0X20.0X20.0 cm
Single Total Weight: 5.500 kg
Addendum:
2026.09.23 The generator I ordered arrived. The specifications are 250RPM 24V 50W.
I'll try replacing it tomorrow.
Since the shapes are quite different, I'll start by making the base (stack). I'd like to complete this by around the fourth die-cast model.
Update:
2026.09.24 I installed a 250RPM 24V 50W motor.
In conclusion, it didn't work. As many of you commented, the rotational torque is insufficient.
To increase the torque, I need to consider the diameter and width of the waterwheel, the amount of water, and the water drop.
I learned a lot, thank you everyone.
I'm taking a break from making the waterwheel for now.
20 Comments
ちなみに水を差すわけではないですが、アルキメデスの螺旋を活用した角野製作所の〝螺旋式ピコ水力発電装置「ピコピカ10」〟は¥108,460です。
主な仕様は、
外径寸法 ： H380×W280×D1085（ｍｍ）
重 量 ： 17.5㎏
用途など ： 防犯灯、獣害防止用電柵電源など 参考になれば幸いです。
水力発電って難しいもんなんだな
ただし、「幅を広げた分だけ受け止める水の量（流量）を増やせるか」によって結果が変わります。
水車が発生するトルクは、水が羽根を押す「力（水圧・水量）」と、回転軸からの「距離（水車の半径）」で決まります。水車の幅を広げた場合の影響と注意点は以下の通りです。
1. 水幅や流量も一緒に増やす場合（トルクUP）原理: 幅を広げ、そこに取り込む水の量（流量）を増やすと、水車全体で受け止める水の重量や流動エネルギーが増加します。結果: 水が羽根を押す総合的な力（F）が大きくなるため、トルク（T = F ✕ r）が上がります。※ r （半径・距離 / Radius）
2. 水の量（流量）が変わらない場合（トルクは変わらない／低下する）原理: 水路の幅が変わらず、供給される水の量が一定のまま水車の幅だけを広げても、水車全体に当たる水の力は変わりません。結果: トルクは増えません。むしろ水車自体が重くなり（慣性モーメントの増加）、軸受の摩擦抵抗が増えることで、かえってトルクや回転効率が落ちる可能性があります。
トルクを上げるその他のアプローチ
水車の幅を広げる以外の主なトルク向上手段は以下の通りです。
アプローチ 仕組み メリット / 注意点
水車の半径（直径）を大きくする 軸からの距離（$r$）を伸ばす トルク増加に最も効果的。ただし回転数は下がる
落差（水圧）を高くする 水が叩きつける勢いを強める 位置エネルギーが増え、力（F）が大きくなる
羽根の形状を最適化する 水の受け止め効率を高める 水のエネルギーを逃さず運動エネルギーに変換できる
水車の幅拡張によるトルク向上を狙う際は、「水車の幅に合わせて供給する水の幅・流量も同時に確保できるか」を確認することが重要です。
増水時の機器保全
発電機までのエネルギーロス
こういうパイロットプラントは問題点を発見し改善していくのが主目的
必ず１００Ｗは実現すると思います
充電可能になれば２４時間稼働できる代替エネルギーとしての道が開けると思います
ただモーターに水車をつけただけの簡単な仕組みでしたが一応電球は光らせる事ができてました。
白鷹町 小水力発電 実験 2026年 第2弾
1334sugar
83,474 views
Shirataka Town Small-Scale Hydroelectric Power Generation Experiment, 2026, Part 2
We tried it out in a small house.
Target Output: 300W, 24V
The waterway itself will not be left in the water, and it will be possible to return to its original state immediately.
Generator specifications: 100W-400W at 300rpm
Considering the water volume and turbine size, 300rpm seems to be the limit.
The current equipment cannot generate electricity; it seems necessary to re-select the generator motor.
https://link.amazon/B09b7UkXd
300rpm Wind Turbine Generator, 12V 24V 48V Low RPM Alternator Permanent Magnet 3-Phase AC Alternator 100W-400W Generator
Addendum:
2026.09.07 We experimented with the generator and forced it to rotate at 750rpm with a motor.
(750rpm is from the specifications of the motor used)
It produced 100W.
The current device only rotates at 300rpm to 350rpm, so the power generation is extremely low. I will continue to investigate tomorrow to see how many rotations are needed to produce 100W. I'm recording the video and will upload it later.
2026.09.08 Results are in. (YouTube) 中華製 何回転で 発電するの？ 仕様は300rpm 第3弾
≒ 100W at 750rpm. It seems that to produce 300W, it needs to rotate at 750rpm or higher.
Unit 1: https://link.amazon/B0hIEoZMy
Unit 2: https://link.amazon/B03ZFUGLh
Unit 3: https://link.amazon/B0im7TxOH
Addendum:
2026.09.09 I bought PVC pipes to give the water more force. I also ordered a 24V 50W 250rpm generator, as generators above 50W are expensive.
This one is 250rpm and I'm trusting it will produce 50W, so I'm trying it out.
Specifications:
Output Voltage: 24V
Brand: SMARAAD Model Number: PMG165-50
Rotor Diameter: 250mm
Product Name: Disc Coreless Permanent Magnetic Generator
Rated Speed: 250RPM
Current Rating: 4A
Shaft Diameter: 25mm
Insulation Resistance:
100Mohm Min (500V DC)
Housing Material: Aluminum (Alloy)
Shaft Material: Steel
Single Package Size: 20.0X20.0X20.0 cm
Single Total Weight: 5.500 kg
Addendum:
2026.09.23 The generator I ordered arrived. The specifications are 250RPM 24V 50W.
I'll try replacing it tomorrow.
Since the shapes are quite different, I'll start by making the base (stack). I'd like to complete this by around the fourth die-cast model.
Update:
2026.09.24 I installed a 250RPM 24V 50W motor.
In conclusion, it didn't work. As many of you commented, the rotational torque is insufficient.
To increase the torque, I need to consider the diameter and width of the waterwheel, the amount of water, and the water drop.
I learned a lot, thank you everyone.
I'm taking a break from making the waterwheel for now.