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MARCH 2009  Back to February 09  Forward to April 09

March stats; Turbine production 159.21 KWh. PV production 272.29 KWh. 100% powered by RE.

3/1 6:48, 15.21 KWh turbine production overnight and sunny conditions this morning! PV production 18.07 KWh. Turbine production 21.71 KWh. 39.78 KWh is the top generation day so far!! For the system to generate this much I need to turn on everything or the batteries fill and then the system throttles down production.

3/2 PV production 17.73 KWh. Turbine production 3.02 KWh.

3/3 PV production 9.95 KWh. Turbine production 4.62 KWh.

3/4 PV production 12.04 KWh. Turbine production 3.16 KWh.

3/5 PV production 1.41 KWh. Turbine production 6.58 KWh. Hot water at 27C.

3/6 So far we have made all our hot water and power from the sun and wind this month. PV production 17.38 KWh. Turbine production 2.63 KWh. Solar hydronic water tank got to 41C and electric hot water tank cycled at least four times today.

3/7 PV production 8.24 KWh. Turbine production 4.07 KWh. Hot water at 38C.

3/8 PV production 7.79 KWh. Turbine production 8.39 KWh. Hot water at 53C.

3/9 PV production 10.7 KWh. Turbine production 2.47 KWh. Hot water dropped to 41C.

3/10 PV production 9.23 KWh. Turbine production 4.06 KWh. Hot water at 37C.

3/11 PV production 5.38 KWh. Turbine production 11.49 KWh. Hot water at 27C.

3/12 The wind started blowing again last night and I was able to turn on the electric water heater and make hot water from a North wind. So we still have manufactured hot water and all power, continuously, all this month. Getting a better return from South wind too. I recomissioned the battery bank new on 2/4 and it still seems to have a proper value on the battery soc. I begin to see a pattern, if I reset the maximum generation voltage lower to protect the AGM batteries, I get problems with battery soc. but if I use the factory preset values, battery soc seems to stay correct longer. But there are several contributing factors; battery temp., change of temp offset increase, for two. The bank absolutely works better at moderate temperatures and factory preset control values. I can only hope my AGM batteries can handle the slight higher values of charge that the factory preset offers compared to the nameplate value of max recharge rate of the batteries. If I had only one thing to do to better balance this system I would add 450 amp hours of battery storage, another $3,200 worth of batteries, total of 1,350 ah at 10 hour rate and 48 volt. The system can recharge the overnight usage in just three hours of sun. The extra batteries would offer no problems. PV production 3.09 KWh. Turbine production 6.16 KWh. Water at 22C.

3/13 6:46,Good thing it's clear this morning, I need the solar power! Only about half a KWh overnight from wind. I'm going to try to electrically heat water out of the battery bank but the bank is dropping to 46.9V and may turn off the system. Interesting, with the electric hot water heater off and bank at 48.4V there is no turbine production but with the heater on and the bank at 46.9V the turbine immediately begins producing a couple hundred watts. This lends credence to my theory that all turbine performance graphs are fraudulent in terms of true generation onto a battery bank, and why we need a 12 mph wind to really do any good even though the turbine begins spinning at 6 mph, but does not generate at all at 7, 8, 9, 10 mph. 6:53, 46.8V and still going...this is where the extra batteries will be appreciated, for the extra voltage pressure. 7:01 and 46.7V, I'm turning off the heater. NOTE; the electric water heater is 3800w 240AC. I have bounced back to 48.0V and will make more coffee! The turbine went from generating a couple hundred watts to 15 - zero watts. 17:13, Lowest temp today of the solar hydronic water was 17C. Now it's 27C, got {some sun} today. Have a tank of electrically heated [RE] water and the heater is off, 66% in the battery soc, PV production 12.03 KWh, Turbine production 1.39 KWh.

3/14 !Thanks!, to the early morning breeze that bumped 1.7 KWh into the system! PV production12.43 KWh. Turbine production 4.63 KWh. Water at 38C. Battery bank back to full.

3/15 PV production 15.43 KWh. Turbine production 1.06 KWh. Water at 41C. My better two thirds did several loads of wash today, in both washers at the same time.

3/16 PV production 15.53 KWh. Turbine production 0.32 KWh. Water at 48C.

3/17 PV production 18.01 KWh. Turbine production 0.50 KWh. Water at 58C.

3/18 PV production 13.81 KWh. Turbine production 0.59 KWh. Water at 60C.

3/19 5:22, Got a nice 4.26 KWh form the wind overnight, so we wake up with as much in the battery soc as when the sun went down last night. I had to reboot the master inverter to new battery today. I noticed it lost track of the battery soc again, said the battery was at 50%, although it was full and maxed out on voltage. 2/4 was the last time I recommissioned new battery. So every six weeks we must reboot and recommission the battery bank or it will cause a shut down even though the voltage is fine, (it shuts off if it thinks the battery bank is below 20%.) I could get tired of that, need to call the tech guy to see if there is a fix or if I am doing something wrong. PV production 8.95 KWh. Turbine production 5.08 KWh. The system seems to have lost track in the last few days. It was doing well. Water at 57C. It was a clear day, the PV production is low because the batteries are full and there was no demand. That may have something to do with the battery soc discrepancy. Before this day I have turned on stuff to try to use most of the generation. Good argument for a full system load shed. I could have two electrical water heating elements tied into the Sunny Island's two load shed internal switches and heat water.

3/20 PV production 13.85 KWh. Turbine production 0.82 KWh. Water at 56C.

3/21 PV production 6.73 KWh. Turbine production 0.99 KWh. Water at 43C.

3/22 PV production 14.23 KWh. Turbine production 1.28 KWh. Water at 50C.

3/23 PV production 13.5 KWh. Turbine production 7.04 KWh. Water at 48C.

3/24 PV production 0.793 KWh. Turbine production 11.27 KWh. Water at 32C.

3/25 PV production 11.94 KWh. Turbine production 1.64 KWh. Water at 42C.

3/26 PV production 10.08 KWh. Turbine production 0.89 KWh. Water at 52C.

3/27 PV production 5.45 KWh. Turbine production 9.14 KWh. Water at 49C.

3/28 PV production 4.63 KWh. Turbine production 11.88 KWh. Water at 41C.

3/29 7:11, The turbine is generating 1,500 watts and there is nothing but a light breeze at the house. PV production 7.35 KWh. Turbine production 13.14 KWh.

3/30 PV production 10.53 KWh. Turbine production 6.22 KWh. Water at 51C.

3/31 It's been 40 days since I used any grid power and I think I could have used less in February. Relying on our RE to operate the electric water heater seems to be good for the system. The subtle difference in operation can be summed up to letting the electric water heater operate as long as the battery bank remains above 46.7V while on, and allowing the bank to operate down to 30% before switching to grid power. The battery soc has not fallen below 70% since I recommissioned it on 3/19, and this morning indicates 99% state of health and 1.06 charge factor. Yes, looking back over my journal I think I could have easily stayed off grid since adding 31 feet to the turbine mast, including electrically heating our water. The February electric bill was the lowest since installing the system and I used zero grid power for March. WOW!! Today was a great sunny/windy day. I am cooking supper with electric oven and two electric elements on the cook top and the wind turbine still is off some of the time. This would have been a generation day for the record book if there was more to suck power! Thing is we started the day with full batteries. March came in like a Lion and goes out like a Lion! 5-6 KW generation possible today, just no place to put it. PV production 7.7 KWh. Turbine production 8.85 KWh. Water at 51C.

MARCH 2009  Back to February 09  Forward to April 09


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