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Search: Posts Made By: NiHaoMike
Forum: Appliances & Gadgets 08-21-22, 03:44 PM
Replies: 0
Views: 430
Posted By NiHaoMike
DIY water usage tracker

https://www.youtube.com/watch?v=BNK92ep8DhY
Forum: Appliances & Gadgets 07-31-22, 11:57 AM
Replies: 2
Views: 551
Posted By NiHaoMike
Those little sealed lead acid batteries usually...

Those little sealed lead acid batteries usually don't last long even in the best of conditions, they're built to be cheap. Not to mention largely obsolete when lithium batteries are cheaper nowadays....
Forum: Geothermal & Heat Pumps 06-17-22, 10:00 PM
Replies: 4
Views: 940
Posted By NiHaoMike
Sounds like the most economical option would be...

Sounds like the most economical option would be to open two windows at night and set a fan in one to take advantage of nighttime cooling. Even in a much hotter climate like Texas, it's enough to...
Forum: Solar Power 10-24-21, 07:41 PM
Replies: 2
Views: 1,798
Posted By NiHaoMike
Add a SSR to switch the water heater, then use an...

Add a SSR to switch the water heater, then use an Arduino to control it based on the water temperature and battery voltage.
Forum: Geothermal & Heat Pumps 07-30-21, 09:29 PM
Replies: 5
Views: 1,940
Posted By NiHaoMike
Is the water heater (presumably natural gas) in...

Is the water heater (presumably natural gas) in the garage? Might want to consider connecting a radiator (designed to withstand the water pressure) and circulating pump to it as a hot water fed space...
Forum: Tools 05-06-21, 12:18 AM
Replies: 5
Views: 2,818
Posted By NiHaoMike
Arduino + thermocouple ADC board.

Arduino + thermocouple ADC board.
Forum: EcoRenovator Blog Discussion 03-31-21, 01:11 AM
Replies: 13
Views: 7,566
Posted By NiHaoMike
Perhaps more investment in automated load...

Perhaps more investment in automated load management is the answer? The technology to make it happen (for example, Raspberry Pi or ESP32) is dirt cheap. Likewise, thermal storage for HVAC is also...
Forum: Appliances & Gadgets 08-10-20, 10:19 PM
Replies: 10
Views: 5,570
Posted By NiHaoMike
Definitely time for a better soldering iron....

Definitely time for a better soldering iron. Something like the TS-100 will handle 12AWG wires with ease. It uses integrated heater cartridges with better coupling than the older irons that merely...
Forum: Conservation 07-19-20, 11:43 AM
Replies: 33
Views: 17,136
Posted By NiHaoMike
You use the contactor (a very heavy duty relay)...

You use the contactor (a very heavy duty relay) to switch the water heater, then you use a smart plug to switch the contactor. Not having an outlet nearby makes things slightly more complex, really...
Forum: Conservation 07-13-20, 09:04 AM
Replies: 33
Views: 17,136
Posted By NiHaoMike
Just get a contactor with a 120V coil and control...

Just get a contactor with a 120V coil and control it with a smart plug.
Forum: Geothermal & Heat Pumps 06-24-20, 09:49 AM
Replies: 20
Views: 10,904
Posted By NiHaoMike
Go with good quality (e.g. Kester) 63/37 leaded...

Go with good quality (e.g. Kester) 63/37 leaded solder. Lead free is harder to work with so I do not recommend it for a beginner. For the iron, go for the TS100 if you want one that's portable or a...
Forum: Geothermal & Heat Pumps 06-01-20, 12:02 AM
Replies: 4
Views: 4,325
Posted By NiHaoMike
Interesting new take on a window A/C

https://www.youtube.com/watch?v=f2NmgOvIv2M
About the only features that seem to be missing are heat pump operation and infrared tracking to automatically direct airflow where needed.
Forum: Solar Power 04-20-20, 09:54 AM
Replies: 26
Views: 17,317
Posted By NiHaoMike
I got a lot more parts for the inverter (the...

I got a lot more parts for the inverter (the inverter module itself, capacitor bank, inductor cores, various control circuit parts) and I'm working on it. It will be a long project for sure, one with...
Forum: Appliances & Gadgets 01-25-20, 11:29 PM
Replies: 3
Views: 4,499
Posted By NiHaoMike
I suggest asking EEVblog. It looks like a JST SH...

I suggest asking EEVblog. It looks like a JST SH but it's important to examine the connector carefully since I have seen variants with subtle differences specifically to prevent cross connections.
Forum: Appliances & Gadgets 12-27-19, 06:41 PM
Replies: 6
Views: 7,753
Posted By NiHaoMike
You can manually turn down the backlight...

You can manually turn down the backlight brightness.
Forum: Solar Power 12-04-19, 10:23 PM
Replies: 26
Views: 17,317
Posted By NiHaoMike
No, the inverter works by sourcing a current to...

No, the inverter works by sourcing a current to offset the load current, more like "blending" than "switching". For example, if the load is drawing 10A, the inverter will supply 10A to offset it. (In...
Forum: Solar Power 12-03-19, 11:39 PM
Replies: 26
Views: 17,317
Posted By NiHaoMike
PV inverter from Prius inverter

I'm looking to build a bigger solar power system, with thermal storage. Since going full grid tie is a bit involved, I'm planning to make it "zero export" with limited battery storage instead....
Forum: Tools 11-27-19, 07:59 PM
Replies: 6
Views: 6,400
Posted By NiHaoMike
Dave Jones of EEVblog just reviewed a cheap bench...

Dave Jones of EEVblog just reviewed a cheap bench PSU.
https://www.youtube.com/watch?v=0qjLx_HsKUQ
Forum: Energy Storage 08-24-19, 02:33 PM
Replies: 39
Views: 22,712
Posted By NiHaoMike
You'll have to short the data lines to each other...

You'll have to short the data lines to each other to signal fast charging and adjust the voltage to a bit above 5V, probably 5.2V or so would be ideal. Also, if you're putting USB-C sockets on the...
Forum: Energy Storage 08-22-19, 08:35 PM
Replies: 39
Views: 22,712
Posted By NiHaoMike
Just one fuse at the battery is all you need for...

Just one fuse at the battery is all you need for your setup. If it's still 15W, a 7.5A or 10A fuse will give plenty of margin.
Forum: Other Improvements 08-22-19, 08:32 PM
Replies: 5
Views: 3,953
Posted By NiHaoMike
12V bilge pumps are very common and quite cheap.

12V bilge pumps are very common and quite cheap.
Forum: Energy Storage 08-04-19, 08:43 PM
Replies: 39
Views: 22,712
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: Energy Storage 08-02-19, 08:33 PM
Replies: 39
Views: 22,712
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: Energy Storage 08-01-19, 01:03 AM
Replies: 39
Views: 22,712
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, 06:51 PM
Replies: 5
Views: 4,799
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.
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