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Search: Posts Made By: BillG
Forum: Geothermal & Heat Pumps 01-11-20, 11:42 AM
Replies: 18
Views: 606
Posted By BillG
Good choices. Get a gas fireplace that is...

Good choices. Get a gas fireplace that is efficient at heating the rooms, not one that is just made for looks. That way you will have a good source of backup heat if you lose power.

And, for...
Forum: Geothermal & Heat Pumps 01-10-20, 10:57 AM
Replies: 18
Views: 606
Posted By BillG
Thanks for the thoughts. I wouldn't call the...

Thanks for the thoughts.

I wouldn't call the indoor units "air handlers." They are maybe 35" wide, 8" deep and 11" high, with a small fan and coil inside. The fan motor is a permanent magnet,...
Forum: Geothermal & Heat Pumps 01-10-20, 10:08 AM
Replies: 18
Views: 606
Posted By BillG
OK. I live in MN, and agree with the guys that...

OK. I live in MN, and agree with the guys that say that a radiant floor is the most comfortable form of heat. That said, with a design day of 40 where you live, I doubt that radiant heat would do...
Forum: Lighting 02-18-19, 07:31 PM
Replies: 26
Views: 2,068
Posted By BillG
Well, I said it before, but will say it again....

Well, I said it before, but will say it again. The number came from PVWatts. This is the gold standard tool, from the National Renewable Energy Lab, NREL. Since you used Sacramento, so did I. I...
Forum: Lighting 02-18-19, 08:08 AM
Replies: 26
Views: 2,068
Posted By BillG
Good. We agree on one thing. The 30 Ah battery,...

Good. We agree on one thing. The 30 Ah battery, utilizing 25% of its charge, is 90 Wh, not 225 as previously stated. 90 Wh is only enough for one single night, and will fail if there is a cloudy...
Forum: Lighting 02-16-19, 09:23 PM
Replies: 26
Views: 2,068
Posted By BillG
You lost me with the math. With using your...

You lost me with the math. With using your recommended 25% of capacity of a 12V 30Ah battery, I get 90 Wh, only 12.8 hours for the 7 watt LED that he wants to use.
Forum: Lighting 02-16-19, 03:13 PM
Replies: 26
Views: 2,068
Posted By BillG
Well, a 75% cutoff would then require (4) 24...

Well, a 75% cutoff would then require (4) 24 series batteries. That is too many to safely wire in parallel, in my opinion. I agree that the battery will last longer, but suggest using batteries...
Forum: Lighting 02-16-19, 12:04 AM
Replies: 26
Views: 2,068
Posted By BillG
Pool Man, there are a couple of things to...

Pool Man, there are a couple of things to consider regarding sizing of the battery and the panel.

1) How many days do you want the light to operate in the absence of sunlight?
2) How fast do...
Forum: Renovations & New Construction 08-29-18, 09:35 AM
Replies: 5
Views: 1,105
Posted By BillG
Drake, I'm with you. I think some of the...

Drake, I'm with you. I think some of the responses were thinking you were talking about spacing between the pipes, but I think you were talking about the length of the run.

Shorter runs will give...
Forum: Solar Power 08-29-18, 09:07 AM
Replies: 16
Views: 1,855
Posted By BillG
Actually, the correct term for this is "ground...

Actually, the correct term for this is "ground fault." I agree with Ben that it is not possible to have an imbalance between the two legs of the same circuit. A mechanical analogy would be...
Forum: Geothermal & Heat Pumps 01-26-18, 11:58 AM
Replies: 23
Views: 2,909
Posted By BillG
Why do you need a 4-port? You should easily be...

Why do you need a 4-port? You should easily be able to do this with a standard 3-port valve. Hot water goes in one inlet, return teed into the other inlet, and circulating pump for the zone on the...
Forum: Geothermal & Heat Pumps 07-20-16, 12:54 PM
Replies: 1,940
Views: 1,433,915
Posted By BillG
Just an engineer here, AC. When others argue...

Just an engineer here, AC. When others argue over whether a glass is half full or half empty, we engineers just figure that the glass was made twice as big as it needed to be.

There are...
Forum: Geothermal & Heat Pumps 07-19-16, 07:07 PM
Replies: 1,940
Views: 1,433,915
Posted By BillG
Well, I'm only about ten pages into the thread,...

Well, I'm only about ten pages into the thread, and maybe it will answer the questions after I get further. There are a couple of projects in mind. First, I am planning to build a cabin soon, to...
Forum: Geothermal & Heat Pumps 07-19-16, 12:21 PM
Replies: 1,940
Views: 1,433,915
Posted By BillG
Thanks for doing this, Hacker. I'm one who is...

Thanks for doing this, Hacker. I'm one who is very interested, and have several applications in mind.

Bill in MN
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