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Search: Posts Made By: NiHaoMike
Forum: Conservation 09-04-20, 08:11 PM
Replies: 189
Views: 153,020
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: 153,020
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: Conservation 07-22-20, 09:18 PM
Replies: 189
Views: 153,020
Posted By NiHaoMike
Try increasing the PWM frequency to above 20kHz.

Try increasing the PWM frequency to above 20kHz.
Forum: Conservation 08-06-18, 06:08 PM
Replies: 189
Views: 153,020
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: Conservation 03-04-18, 12:15 AM
Replies: 189
Views: 153,020
Posted By NiHaoMike
Are you using classical PWM or some sort of Delta...

Are you using classical PWM or some sort of Delta Sigma? The latter would require a FPGA but those are quite cheap! A Spartan 6 LX16 board goes for $20 nowadays and would be plenty to implement...
Forum: Conservation 02-25-18, 10:20 PM
Replies: 189
Views: 153,020
Posted By NiHaoMike
V/Hz scaling is just a bit of code. You'll be a...

V/Hz scaling is just a bit of code. You'll be a lot more limited in how much you can apply, but going down to 200/100V and 50Hz should work fine. (Just ask the Japanese!) Even then, a 20% power usage...
Forum: Conservation 02-25-18, 06:27 PM
Replies: 189
Views: 153,020
Posted By NiHaoMike
For that use case, I would suggest having...

For that use case, I would suggest having multiple smaller inverters rather than a single large one. Apart from redundancy, being able to do V/Hz control on a zone by zone basis is very helpful for...
Forum: Conservation 02-25-18, 03:54 PM
Replies: 189
Views: 153,020
Posted By NiHaoMike
Inverters that run from 360V or so are very...

Inverters that run from 360V or so are very common, but are more commonly called "VFDs". (Although at 20kW, I would expect most of those to run from 480V AC/700V DC. And I would also expect most 20kW...
Forum: Conservation 04-23-16, 06:44 PM
Replies: 189
Views: 153,020
Posted By NiHaoMike
The requirements can be very low for a student....

The requirements can be very low for a student. It helps that heating is rarely even needed in College Station and that the usual fall/spring semesters miss the hottest days of the year. Hot water in...
Forum: Conservation 04-23-16, 01:30 PM
Replies: 189
Views: 153,020
Posted By NiHaoMike
It can make sense where the service fees are...

It can make sense where the service fees are high. One example of that would be some parts of College Station, TX where the service fees were on the order of $40/month. Not sure if it's still that...
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