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Search: Posts Made By: NiHaoMike
Forum: Appliances & Gadgets 08-04-19, 07:43 PM
Replies: 26
Views: 742
Posted By NiHaoMike
Just build a dual comparator circuit with one...

Just build a dual comparator circuit with one output to trigger around 3.15V and another around 3.45V. That will give an easy indication of low and high charge. If you want more accuracy, you'll have...
Forum: Appliances & Gadgets 08-02-19, 07:33 PM
Replies: 26
Views: 742
Posted By NiHaoMike
It's a 555 in an adjustable duty cycle...

It's a 555 in an adjustable duty cycle configuration driving a buck converter.
Forum: Appliances & Gadgets 08-01-19, 12:03 AM
Replies: 26
Views: 742
Posted By NiHaoMike
From a quick search, it looks like 1S LiFePO4 BMS...

From a quick search, it looks like 1S LiFePO4 BMS boards are hard to come by, but 4S LiFePO4 BMS boards are really common. If the 4 cells are closely matched, you can just go for a 4S pack, would...
Forum: Appliances & Gadgets 04-18-19, 05:51 PM
Replies: 5
Views: 452
Posted By NiHaoMike
Add a drop of threadlock glue to stop it from...

Add a drop of threadlock glue to stop it from coming out again.
Forum: The Billiards Room 02-04-19, 09:31 PM
Replies: 7
Views: 913
Posted By NiHaoMike
Another option that recently came out is the...

Another option that recently came out is the ESP32 camera.
https://hackaday.com/2019/02/02/cheap-esp32-webcam/
Forum: Conservation 01-02-19, 06:01 PM
Replies: 6
Views: 625
Posted By NiHaoMike
Find a used UPS that takes a single 12V battery...

Find a used UPS that takes a single 12V battery and just connect it.
Upgrade your UPS! (with some car batteries...) (http://dansdata.com/upsupgrade.htm)
Forum: Solar Power 12-12-18, 11:03 PM
Replies: 51
Views: 15,287
Posted By NiHaoMike
20V gate IGBTs are pretty unusual. Most common...

20V gate IGBTs are pretty unusual. Most common are 10V to 15V on and 0 to -10V off, the latter being especially variable depending on application - generally high speed switching of more than a few...
Forum: Conservation 08-06-18, 06:08 PM
Replies: 159
Views: 19,636
Posted By NiHaoMike
Do you have any dedicated freezers? Install...

Do you have any dedicated freezers? Install relays to bypass the thermostat when the charge level is very high. Also set the water heater to a higher temperature during that time, if it's electric or...
Forum: Geothermal & Heat Pumps 06-29-18, 11:48 PM
Replies: 13
Views: 1,456
Posted By NiHaoMike
A lot of computer fans are rated for surprisingly...

A lot of computer fans are rated for surprisingly high temperatures, because it can get that hot on the exhaust side of a heatsink. But maybe you could add the fans on the inlet side?

I suggest...
Forum: Other Improvements 03-25-18, 01:29 AM
Replies: 4
Views: 785
Posted By NiHaoMike
I have put together a 12.8V, 82Ah LiFePO4 pack...

I have put together a 12.8V, 82Ah LiFePO4 pack (4S15P 32650s) as a drop in replacement for a common 12V lead acid and am currently working on a 16.4V, 65Ah LiMn (2x Nissan Leaf modules) smart battery...
Forum: The Billiards Room 02-03-18, 12:53 PM
Replies: 25
Views: 3,494
Posted By NiHaoMike
Found this interesting article about Bitcoin...

Found this interesting article about Bitcoin mining:
http://cseweb.ucsd.edu/~mbtaylor/papers/Taylor_Bitcoin_IEEE_Computer_2017.pdf
Many of the basic concepts also apply to altcoin mining, except...
Forum: The Billiards Room 02-01-18, 09:44 AM
Replies: 7
Views: 913
Posted By NiHaoMike
Search for Ethernet connected outdoor cameras....

Search for Ethernet connected outdoor cameras. Most of those will support PoE as well. Then use a Raspberry Pi as your own server.
Forum: The Billiards Room 01-31-18, 10:55 PM
Replies: 7
Views: 913
Posted By NiHaoMike
There are plenty of outdoor IP cameras available....

There are plenty of outdoor IP cameras available. Just run a long wire to power it.
Forum: Appliances & Gadgets 11-17-17, 01:43 PM
Replies: 29
Views: 2,755
Posted By NiHaoMike
I decided to make some measurements on my Tegra...

I decided to make some measurements on my Tegra X1 platform, a Nvidia Shield TV Pro with 128GB SSD.
It idles at 4.1W, 2D playback at 5.6W (varies with content, have seen spikes of 6.2W with fast...
Forum: Appliances & Gadgets 11-16-17, 03:49 PM
Replies: 29
Views: 2,755
Posted By NiHaoMike
If your always on requirements are very modest,...

If your always on requirements are very modest, use a Raspberry Pi for that. I mine Curecoin and Foldingcoin with my GPU so my main PC stays running all the time.

This extreme modder got an i3...
Forum: Appliances & Gadgets 11-15-17, 11:48 AM
Replies: 29
Views: 2,755
Posted By NiHaoMike
Intel GPUs have always been quite disappointing...

Intel GPUs have always been quite disappointing unless all you need is something that does office work and next to nothing else, not even high quality video scaling. Find out how much a 750Ti, 950,...
Forum: Appliances & Gadgets 11-14-17, 06:12 PM
Replies: 29
Views: 2,755
Posted By NiHaoMike
I would suggest going with AMD Ryzen. Reviews...

I would suggest going with AMD Ryzen. Reviews indicate that its efficiency is quite good. Keep the old GPU for now even if its efficiency is poor, so you can wait for a good deal to get a new one....
Forum: Solar Power 11-10-17, 09:22 PM
Replies: 5
Views: 1,038
Posted By NiHaoMike
a great use for a 100W solar panel

I recently got a 100W solar panel and among other things, it powers my cryptocurrency mining cluster. It's a rather small cluster consisting of a few cheap smartphones, two old tablets, and a small...
Forum: The Billiards Room 04-26-17, 02:40 AM
Replies: 25
Views: 3,494
Posted By NiHaoMike
A whole bunch of altcoin mining rigs - a few...

A whole bunch of altcoin mining rigs - a few cheap smartphones and old tablets plus a small ASIC board. Altogether, they use about 15W or so and yield around $80/month worth of altcoins - enough to...
Forum: Geothermal & Heat Pumps 03-04-17, 10:07 PM
Replies: 16
Views: 2,209
Posted By NiHaoMike
Pull a vacuum, then weigh in the charge.

Pull a vacuum, then weigh in the charge.
Forum: Conservation 01-14-17, 11:18 AM
Replies: 30
Views: 3,948
Posted By NiHaoMike
Or just build an air compressor designed to run...

Or just build an air compressor designed to run on DC to begin with? Forklift motors were once a popular option for 48V motors, but now there are also motors for hybrid bicycles if you prefer...
Forum: The Billiards Room 12-05-16, 10:17 PM
Replies: 25
Views: 3,324
Posted By NiHaoMike
My favorite is the Mooshimeter...

My favorite is the Mooshimeter (http://amzn.to/2it8U9G), a Bluetooth dual channel multimeter. I got it since it doesn't have a rotary switch to wear out or get dirty (that's a very common problem I...
Forum: Other Improvements 11-04-16, 11:25 PM
Replies: 3
Views: 1,220
Posted By NiHaoMike
It's about matching the impedance. All a MPPT...

It's about matching the impedance. All a MPPT controller does is vary its effective input impedance to try to get the most power out. The correct algorithm depends on the characteristics of the...
Forum: Solar Power 08-13-16, 06:16 PM
Replies: 0
Views: 769
Posted By NiHaoMike
Solar panel deal

320 Watt Semi Flexible Frameless Solar Panel 24 Volt Made in USA Monocrystalline | eBay...
Forum: Geothermal & Heat Pumps 07-15-16, 09:21 AM
Replies: 20
Views: 2,970
Posted By NiHaoMike
Pressure limiting is to keep the suction pressure...

Pressure limiting is to keep the suction pressure from going too high, which is a feature not needed or desired in your application. You'll want the pressure to be able to go high since that...
Showing results 1 to 25 of 219

 
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