EcoRenovator - View Single Post - A7 AirTap install (ASHP hot water heater)

Xringer · 09-10-12, 04:44 PM

I had the oil burner on an early morning burn (using a timer) and it worked out okay..
But, when we did a wash or two, and both of us wanted to shower in the evening.?. Not so good..

Since the average A7 power use is only about 1 kWh per day,
I'm not really worried about paying 16 or 17 cents a day for hot water.

I'm just running it on solar now, just to see if it's possible. I guess it is.

I'll be switching back to the grid before long.. Once it gets a little rainy,
having the back-up power becomes much more important.
Need to have those amp hours in the bank.. Solar looks good for this week!

Woburn September Weather 2012 - AccuWeather Forecast for MA 01801

It's good to see the back-up system prove what it can do, and it might
be good for the battery bank to get a little work out once in a while.

~~~~~~

Edit 9/11/2012: Recharge check
The battery pack looked a little low last night (49.6v / 12.4v per), while the A7 was running.
Since it had been mostly cloudy yesterday, I decided to take the A7 off back-up power today, (the A7 stayed off all day) and let the sun fully recharge the back.
By mid afternoon, output from the charger put 1.2 kWh into the battery,
before the PWM got real low (10%), indicating a good SOC.

So, since the next few days are looking so good, the A7 will stay on solar this week.

09-10-12, 04:44 PM	#153
Xringer Lex Parsimoniae Join Date: Feb 2009 Location: Woburn, MA Posts: 4,918 Thanks: 114 Thanked 250 Times in 230 Posts	I had the oil burner on an early morning burn (using a timer) and it worked out okay.. But, when we did a wash or two, and both of us wanted to shower in the evening.?. Not so good.. Since the average A7 power use is only about 1 kWh per day, I'm not really worried about paying 16 or 17 cents a day for hot water. I'm just running it on solar now, just to see if it's possible. I guess it is. I'll be switching back to the grid before long.. Once it gets a little rainy, having the back-up power becomes much more important. Need to have those amp hours in the bank.. Solar looks good for this week! Woburn September Weather 2012 - AccuWeather Forecast for MA 01801 It's good to see the back-up system prove what it can do, and it might be good for the battery bank to get a little work out once in a while. ~~~~~~ Edit 9/11/2012: Recharge check The battery pack looked a little low last night (49.6v / 12.4v per), while the A7 was running. Since it had been mostly cloudy yesterday, I decided to take the A7 off back-up power today, (the A7 stayed off all day) and let the sun fully recharge the back. By mid afternoon, output from the charger put 1.2 kWh into the battery, before the PWM got real low (10%), indicating a good SOC. So, since the next few days are looking so good, the A7 will stay on solar this week. __________________ My hobby is installing & trying to repair mini-splits EPA 608 Type 1 Technician Certification ~ 5 lbs or less.. Last edited by Xringer; 09-11-12 at 03:20 PM..