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Search: Posts Made By: NiHaoMike
Forum: Geothermal & Heat Pumps 09-18-20, 11:21 PM
Replies: 4
Views: 950
Posted By NiHaoMike
The mini splits with that feature are quite...

The mini splits with that feature are quite sophisticated, with a low resolution thermal IR sensor array, high resolution near IR sensor array, and an embedded Linux processor of similar compute...
Forum: The Billiards Room 09-05-20, 02:06 PM
Replies: 9
Views: 624
Posted By NiHaoMike
California's problems stem from years (decades?)...

California's problems stem from years (decades?) of neglect causing the old infrastructure to become a fire hazard.
Forum: Conservation 09-04-20, 08:11 PM
Replies: 189
Views: 34,030
Posted By NiHaoMike
Good quality batteries are rated to last...

Good quality batteries are rated to last thousands of complete cycles nowadays, even more for partial cycles. If you don't use them, they'll eventually die of old age.

Selling to the grid is not a...
Forum: Conservation 08-28-20, 08:59 AM
Replies: 189
Views: 34,030
Posted By NiHaoMike
It's not stealing any more than charging a laptop...

It's not stealing any more than charging a laptop or hybrid bicycle - there are power strips installed in the study areas specifically for that purpose. Keep in mind that the size of the battery is...
Forum: Appliances & Gadgets 08-10-20, 09:19 PM
Replies: 8
Views: 678
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: Geothermal & Heat Pumps 07-30-20, 07:02 PM
Replies: 21
Views: 2,035
Posted By NiHaoMike
2 tons of refrigeration operating for one hour...

2 tons of refrigeration operating for one hour will only make 183 pounds of ice, or about 23 gallons.

What is the end goal now? Are we building an EV that regularly gets driven (in which case...
Forum: Conservation 07-30-20, 06:36 PM
Replies: 8
Views: 598
Posted By NiHaoMike
There are smart plugs with energy monitoring.

There are smart plugs with energy monitoring.
Forum: Conservation 07-22-20, 09:18 PM
Replies: 189
Views: 34,030
Posted By NiHaoMike
Try increasing the PWM frequency to above 20kHz.

Try increasing the PWM frequency to above 20kHz.
Forum: Geothermal & Heat Pumps 07-22-20, 08:30 AM
Replies: 17
Views: 1,904
Posted By NiHaoMike
The first one will also do surface mount reflow...

The first one will also do surface mount reflow (an advanced process), but I'm not sure about the overall build quality. Might be worth considering if you're planning to do more advanced electronics...
Forum: Geothermal & Heat Pumps 07-20-20, 08:16 PM
Replies: 21
Views: 2,035
Posted By NiHaoMike
Tons per 24 hours, and only for the short time it...

Tons per 24 hours, and only for the short time it takes to cool down. As mentioned, 1 ton is plenty for a fairly large RV.
Forum: Conservation 07-19-20, 10:43 AM
Replies: 14
Views: 1,048
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: Geothermal & Heat Pumps 07-14-20, 10:50 PM
Replies: 21
Views: 2,035
Posted By NiHaoMike
For the batteries, a mere 4-5x per pound compared...

For the batteries, a mere 4-5x per pound compared to ice which actually gets reduced to about 2.5x after derating the batteries. Doesn't seem like a huge improvement compared to the cost. On the...
Forum: Conservation 07-13-20, 08:04 AM
Replies: 14
Views: 1,048
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 07-06-20, 09:17 PM
Replies: 21
Views: 2,035
Posted By NiHaoMike
It takes energy to move batteries as well,...

It takes energy to move batteries as well, although I suppose that can be largely offset with regenerative braking. It's down to the overall cost vs benefit of a large battery pack vs a smaller...
Forum: Geothermal & Heat Pumps 07-06-20, 07:54 AM
Replies: 21
Views: 2,035
Posted By NiHaoMike
The thermal storage can be "recharged" with an...

The thermal storage can be "recharged" with an onboard heat pump. Most likely one based on a 5000BTU/hr window A/C since it's hard to go smaller with decent efficiency and still keep the cost of...
Forum: Geothermal & Heat Pumps 07-04-20, 01:10 PM
Replies: 21
Views: 2,035
Posted By NiHaoMike
1kg of ice will absorb 333kJ of energy. 1kg of...

1kg of ice will absorb 333kJ of energy. 1kg of the best lithium batteries will store on the order of 800kJ of energy, but cheaper ones will store considerably less. Then there's the efficiency of the...
Forum: Geothermal & Heat Pumps 07-01-20, 07:57 PM
Replies: 21
Views: 2,035
Posted By NiHaoMike
Don't bother, ice storage ends up with a very...

Don't bother, ice storage ends up with a very similar amount of cooling per pound of energy storage medium. Unless you're converting it to a plug in hybrid, that is...
Forum: Geothermal & Heat Pumps 06-29-20, 09:33 PM
Replies: 15
Views: 1,306
Posted By NiHaoMike
The insulation is there to make sure the oil...

The insulation is there to make sure the oil doesn't cool off too much when it's not running. Some also have crankcase heaters.
Forum: Geothermal & Heat Pumps 06-24-20, 08:49 AM
Replies: 17
Views: 1,904
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: Solar Power 06-21-20, 11:48 PM
Replies: 24
Views: 5,109
Posted By NiHaoMike
Working on the wireless sensor - managed to get...

Working on the wireless sensor - managed to get it outputting a nice, low jitter signal. For a test, I had it transmitting music over the power line and the quality is surprisingly good - not HD but...
Forum: Renovations & New Construction 06-09-20, 11:24 PM
Replies: 2
Views: 627
Posted By NiHaoMike
The crankcase heater really is only needed during...

The crankcase heater really is only needed during the winter for heat pump operation when the oil might otherwise get too cold. Once you get the replacement, add a diode in series to lower the power...
Forum: Geothermal & Heat Pumps 05-31-20, 11:02 PM
Replies: 4
Views: 950
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 05-26-20, 05:49 PM
Replies: 15
Views: 3,550
Posted By NiHaoMike
The shutdown switches can just be DC SSRs (not...

The shutdown switches can just be DC SSRs (not cheap, but less than $80 each) and a $20 PVAF-T2 takes care of the arc fault detection part.

An even cheaper way would be to use a DC rated switch or...
Forum: Geothermal & Heat Pumps 05-19-20, 10:56 PM
Replies: 17
Views: 1,904
Posted By NiHaoMike
Try cleaning up the burned spot and bridging the...

Try cleaning up the burned spot and bridging the burned track. If it then works, conformal coat it to guard against further arc flash events.
Forum: Renovations & New Construction 05-02-20, 08:17 PM
Replies: 30
Views: 2,677
Posted By NiHaoMike
Have you considered mini splits in order to not...

Have you considered mini splits in order to not need to do any work in the attic? Some don't even need special tools to install.
https://www.youtube.com/watch?v=fLUplfOzjwI
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