Is this a good choice for off grid system?

[OffGridHawaiian]

Aloha Everyone,

Newbie to Off Grid Solar. Just had system installed and have been running for about three weeks. 2 Schneider XW+ 6848-NA 120/240 48V 6800W CONTINUOUS, 8500W30min Inverter, with integrated Power Distribution Panel, and 3XWMPPT80-600Vdc Charge Controller,s 44 LG Optronics 265W High Efficiency Mono-crystalline PV Modules (or equivalent) with 25 year Warranty , 11.66 kWdc Array producing an annual average of 16-54 kWH per day. **24 AQUION ENERGY Aqueous Hybrid Ion (AHI), Benign Salt WaterBatteryS10 Stack’s in a 48V parallel configuration, with 44 usable kWH’s of storage,with 100% DoD capability, and 2 year full replacement warranty. and a Honda EU7000si running on propane.

Do you think I made a good choice?

[sensij]

Do you think I made a good choice?

What is your expected electricity consumption? What did you pay for the system?

[sensij]

Voc for those panels is 38.3. To get 15 panels in a string on each controller, they must be designing around a low temp in the range of 59-67 deg F, with a 1.04 correction per 690.7. For Hawaii, that is probably OK.

[Living Large]

Aloha Everyone,

Newbie to Off Grid Solar. Just had system installed and have been running for about three weeks. 2 Schneider XW+ 6848-NA 120/240 48V 6800W CONTINUOUS, 8500W30min Inverter, with integrated Power Distribution Panel, and 3XWMPPT80-600Vdc Charge Controller,s 44 LG Optronics 265W High Efficiency Mono-crystalline PV Modules (or equivalent) with 25 year Warranty , 11.66 kWdc Array producing an annual average of 16-54 kWH per day. **24 AQUION ENERGY Aqueous Hybrid Ion (AHI), Benign Salt WaterBatteryS10 Stack’s in a 48V parallel configuration, with 44 usable kWH’s of storage,with 100% DoD capability, and 2 year full replacement warranty. and a Honda EU7000si running on propane.

Do you think I made a good choice?

Welcome. You can't go to 100% DOD and still run your inverters. The XW6848 works down to 42V. So even though your batteries can go down to 30V, you'll never get there. Your usable battery bank range may be 44V to 59V, taking into account system losses. That quoted 44 usable kWH may take into account not going under 40V, since some of their data sheets are oriented towards solar users. I believe the nameplate capacity of 24 stacks is over 50 kWH.

That's quite a system. There are several people interested in hearing about real-world performance of AHI batteries, including myself. One metric of interest is how long it takes to charge if the sun isn't shining. Does that ever happen in Hawaii? What is your daily usage in kWH?

ps You are the best judge of if you made the right choice, IMO

[OffGridHawaiian]

What is your expected electricity consumption? What did you pay for the system?

Aloha sensij,

Currently we are averaging 4.0 kHw daily. 75.1 kWh weekly according to the Contex Com Box summary. Total cost with the generator and a concrete pad was $91,000.

[russ]

Aloha sensij,

Currently we are averaging 4.0 kHw daily. 75.1 kWh weekly according to the Contex Com Box summary. Total cost with the generator and a concrete pad was $91,000.

Somewhere the numbers went strange! You are talking about 4 mWh/year - and a 91,000$ investment?

[SunEagle]

Aloha sensij,

Currently we are averaging 4.0 kHw daily. 75.1 kWh weekly according to the Contex Com Box summary. Total cost with the generator and a concrete pad was $91,000.

Wow. Only 4.0 kWh a day from the battery system. The home you described in the other thread is very big so I presume most of the electric usage is during the day and supplied by your solar array so you use much less at night.

[Living Large]

Aloha sensij,

Currently we are averaging 4.0 kHw daily. 75.1 kWh weekly according to the Contex Com Box summary. Total cost with the generator and a concrete pad was $91,000.

Is there a typo - 4kWH daily would be 28 weekly.

4kWH seems quite low for the system size. Do you plan for that to increase?

[SunEagle]

Is there a typo - 4kWH daily would be 28 weekly.

4kWH seems quite low for the system size. Do you plan for that to increase?

I missed that. You are correct.

A weekly usage of 75.1 kWh would be a daily average of 10.7 kWh not 4.0kWh. Either there is a typo or his "week" is longer than 7 days.

[Living Large]

I missed that. You are correct.

A weekly usage of 75.1 kWh would be a daily average of 10.7 kWh not 4.0kWh. Either there is a typo or his "week" is longer than 7 days.

I am interested i knowing what daily usage this was designed for - I am going to guess about 10KWh a day, with about 5 to 6 days of autonomy. I believe AHI can charge at 0.2C - which 24 stacks @ about 50 Ah a piece would get with his 11.7 kWH panel output.

So perhaps the 4 kWH daily is a typo.

[SunEagle]

I am interested i knowing what daily usage this was designed for - I am going to guess about 10KWh a day, with about 5 to 6 days of autonomy. I believe AHI can charge at 0.2C - which 24 stacks @ about 50 Ah a piece would get with his 11.7 kWH panel output.

So perhaps the 4 kWH daily is a typo.

I agree. Especially when he described the home as having 9 guest rooms and fully occupied. That 4 kWh seems low unless no one turns on the lights or watches TV at night.

My house is 4 bedrooms ~ 2300 sq ft. and has already consumed about 32 kWh (~ 2kW/hr) with only 2 people in it for most of the day. Most of that consumption is probably due to the heater being on because it is a little cool outside.

I'm still interested in the AHI technology and hope to learn more of what it can provide through someone first hand.

[Sunking]

I believe AHI can charge at 0.2C

Where did you pick that number up at? .2C = C/5. FLA cannot be charged that fast, and with AHI much higher Ri maximum charge rate is more like C/15 to C/20.

[Living Large]

Where did you pick that number up at? .2C = C/5. FLA cannot be charged that fast, and with AHI much higher Ri maximum charge rate is more like C/15 to C/20.

A lack of memory of what you stated 2 months ago, a too quick look at the data sheet and an invalid assumption, coupled with being a novice. I erred, plain and simple.

I found an Aqueon white paper that discusses a C/16 rate, though it isn't clear this is a spec. That is all I could find. That is consistent with your range.

Assuming C/16, that would be about a 75 A charge current for 24 stacks at 50 Ah per stack, or only 3600 W. Now I am wondering why the array is so large.

[Sunking]

A lack of memory of what you stated 2 months ago, a too quick look at the data sheet and an invalid assumption, coupled with being a novice. I erred, plain and simple.

I figure that out, just wanted you to go back and look where you went off the track. A good teacher will make you find the answer because you will not forget it.

[OffGridHawaiian]

Wrong Number

I agree. Especially when he described the home as having 9 guest rooms and fully occupied. That 4 kWh seems low unless no one turns on the lights or watches TV at night.

My house is 4 bedrooms ~ 2300 sq ft. and has already consumed about 32 kWh (~ 2kW/hr) with only 2 people in it for most of the day. Most of that consumption is probably due to the heater being on because it is a little cool outside.

I'm still interested in the AHI technology and hope to learn more of what it can provide through someone first hand.

Sorry about that, average kWh per day varies between 14kWh to 20kWh . Today's usage from 12 midnight to 9pm is 21.2kWh.

Guests leave lights on all the time. Just came from upstairs and one guest has 2 ceiling fans with 3 lights each running on high and she's downstairs in the kitchen. The washing machine is running now, the microwave and a hairdrier just switched on. 3800 W load.

No TV in the house but we have 2 computers running our bioresonance software 24/7