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Search: Posts Made By: u3b3rg33k
Forum: Conservation 05-01-19, 05:27 PM
Replies: 151
Views: 18,461
Posted By u3b3rg33k
From what I've seen the used tesla 24V modules...

From what I've seen the used tesla 24V modules can't be beat on $/kWh.
Forum: Geothermal & Heat Pumps 05-01-19, 05:25 PM
Replies: 2
Views: 208
Posted By u3b3rg33k
I'd be using HPDE instead of PEX for outdoor...

I'd be using HPDE instead of PEX for outdoor applications. seems to work for the geo guys.
Forum: Appliances & Gadgets 03-11-19, 12:52 AM
Replies: 17
Views: 1,674
Posted By u3b3rg33k
the only way a resistance heater can convert less...

the only way a resistance heater can convert less electricity to heat is by lowering the supply voltage. otherwise, the element just runs hotter until a new equilibrium is reached, with the surface...
Forum: Other Improvements 02-25-19, 01:33 AM
Replies: 15
Views: 724
Posted By u3b3rg33k
look into a whole house dehumidifier. don't even...

look into a whole house dehumidifier. don't even look at anything under 100PPD if you care at all about your energy bill. the rules are different for 100PPD+, mandating a significant difference in...
Forum: Conservation 01-17-19, 02:10 AM
Replies: 4
Views: 354
Posted By u3b3rg33k
I think there's a DoE study that shows the impact...

I think there's a DoE study that shows the impact of a HPWH is pretty minimal, even on homes heated by a heat pump, and that it was decisively preferable to any version of "exhausting the cold air...
Forum: Conservation 12-11-18, 01:37 AM
Replies: 26
Views: 36,941
Posted By u3b3rg33k
a quick and dirty reinforcement might be a couple...

a quick and dirty reinforcement might be a couple of T50 staples across the wood/tape mating surface.
Forum: Conservation 12-02-18, 11:24 PM
Replies: 55
Views: 4,298
Posted By u3b3rg33k
I can only hope it's not vaporware. some proper...

I can only hope it's not vaporware. some proper competition for Tesla would be great, and it doesn't look like it's going to come from the big 3.
Forum: Conservation 11-10-18, 02:40 AM
Replies: 12
Views: 962
Posted By u3b3rg33k
well, in FL it's not cheaper to put in solar,...

well, in FL it's not cheaper to put in solar, because FP&L hates all things solar.
Forum: Conservation 10-19-18, 05:50 PM
Replies: 33
Views: 3,197
Posted By u3b3rg33k
i'd love to see those just for fun. i haven't run...

i'd love to see those just for fun. i haven't run them myself because i wasn't planning to build anything any time soon.
Forum: Conservation 09-30-18, 12:32 AM
Replies: 2
Views: 543
Posted By u3b3rg33k
you may want to re-visit your needs. HEPA...

you may want to re-visit your needs.

HEPA filtration is one "need". typically used in hospitals when they do 100% outside air.
outside air requirement - how much fresh air does your building...
Forum: Solar Power 09-09-18, 09:08 PM
Replies: 2
Views: 333
Posted By u3b3rg33k
many states have tax exemptions for solar. you...

many states have tax exemptions for solar. you should look into it and see if your state does this.

keeping land zoned a tax friendly way depends on how you use it. turn woods into lawn, they'll...
Forum: Conservation 09-05-18, 10:35 PM
Replies: 30
Views: 2,969
Posted By u3b3rg33k
a 300W blower motor that contributes its waste...

a 300W blower motor that contributes its waste heat as strip heat shouldn't hurt COP much. either way those must be some really poor heat pumps. I know people much further north than TX that are in...
Forum: Conservation 09-05-18, 10:54 AM
Replies: 30
Views: 2,969
Posted By u3b3rg33k
something is wrong. a heat pump should be more...

something is wrong. a heat pump should be more efficient than strip heat until 0F or lower. if it stops working at high temperature like 35F, well... wow?

for example:...
Forum: Appliances & Gadgets 08-31-18, 09:23 PM
Replies: 4
Views: 497
Posted By u3b3rg33k
heatpipes often have water vapor under partial...

heatpipes often have water vapor under partial vacuum in them as a cheap refrigerant. might account for the expansion.
Forum: Solar Power 08-28-18, 07:36 PM
Replies: 1
Views: 294
Posted By u3b3rg33k
i'd recommend a low pressure cut-out switch. ...

i'd recommend a low pressure cut-out switch. that will turn the system off if the pressure ever drops below say, 20PSI on a 40/60 system.
Forum: Other Improvements 08-27-18, 06:06 PM
Replies: 12
Views: 1,034
Posted By u3b3rg33k
The xantrex XW system - when I looked at it last,...

The xantrex XW system - when I looked at it last, would use the grid to charge batteries when the pricing was advantageous. I'm sure it could be configured either way.

at work, we have UPSes...
Forum: Other Improvements 08-27-18, 01:56 PM
Replies: 12
Views: 1,034
Posted By u3b3rg33k
Selling back should not be hard in Oregon. last I...

Selling back should not be hard in Oregon. last I checked, Portland was HUGE on that.

given your needs, you'll want a system that integrates the generator and solar. solar + generator means...
Forum: Solar Heating 08-05-18, 09:32 PM
Replies: 8
Views: 1,362
Posted By u3b3rg33k
you may not be able to ensure that ALL of your...

you may not be able to ensure that ALL of your excess generation is consumed. you'd end up using 0.5kW worth of solar for the HPWH, and selling 1kW back to the grid. not sure what's available in...
Forum: Solar Heating 08-05-18, 03:09 AM
Replies: 8
Views: 1,362
Posted By u3b3rg33k
if you want to use PV solar to heat water, why...

if you want to use PV solar to heat water, why not a heat pump water heater? 1500W worth of heat on only 500W worth of solar.
Forum: Geothermal & Heat Pumps 08-03-18, 01:35 PM
Replies: 16
Views: 1,672
Posted By u3b3rg33k
what MIGHT work and be simple (haha): get one...

what MIGHT work and be simple (haha):
get one of those Bosch BOVA 3T or 5T ODUs, then put a coax/brazed plate exchanger indoors. they modulate from 25-110% based on load calculated by the ODU. all...
Forum: Lawn and Garden 08-01-18, 11:43 PM
Replies: 352
Views: 200,815
Posted By u3b3rg33k
why not install a smart bank charger on the...

why not install a smart bank charger on the mower? then you have one weatherproof charger that does each battery individually. They're meant for permanent install.
Forum: Geothermal & Heat Pumps 08-01-18, 06:54 PM
Replies: 16
Views: 1,672
Posted By u3b3rg33k
Jeff, i've never seen anything but VS (inverter)...

Jeff, i've never seen anything but VS (inverter) or 2 stage/step in a <5 ton standard split system. the only application i'm readily familiar with digital scrolls in is CRACs. I don't see those as a...
Forum: Solar Power 08-01-18, 06:11 PM
Replies: 4
Views: 329
Posted By u3b3rg33k
if your Li-ion battery is 2kWh, and your lead...

if your Li-ion battery is 2kWh, and your lead acid is 1kWh, then your deep cycle capacities are closer to 1.6kWh (80% DoD) and .6kWh (50% DoD). in effect, the li-ion battery is around 3x larger, if...
Forum: Solar Power 07-31-18, 07:35 PM
Replies: 4
Views: 329
Posted By u3b3rg33k
convert to kWh. compare kWh. then Ah/voltage...

convert to kWh. compare kWh. then Ah/voltage doesn't matter.
Also remember practical capacity - li-ion drawdown regularly to 20%, charge up to 80%, rinse and repeat, SoC doesn't matter in that...
Forum: Geothermal & Heat Pumps 07-30-18, 12:57 PM
Replies: 16
Views: 1,672
Posted By u3b3rg33k
I imagine there are very few people who want to...

I imagine there are very few people who want to match their AC output to solar output. 99.999% of the market wants their AC output to match the thermal load.

I could see it in a utility scale...
Showing results 1 to 25 of 72

 
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