Help sorting this out!
Comments

First lets calculate the load, you have 1550 watts + your inverter is likely only 88% efficient. So the total load is more like (1550 ÷ .88=) 1761 watts. 1761 watts ÷ 12 volts = 146.75 amps... Perhaps I need not continue.
Home system 4000 watt (Evergreen) array standing, with 2 Midnite Classic Lites, Midnite Epanel, Magnum MS4024, Prosine 1800(now backup) and Exeltech 1100(former backup...lol), 660 ah 24v Forklift battery(now 10 years old). Off grid for 20 years (if I include 8 months on a bicycle).
 Assorted other systems, pieces and to many panels in the closet to not do more projects. 
Ok, I suspected as much. Thank you for verifying that for me. Is it assumed that the above #'s are based on an hours use? Meaning for .5 hours my draw would be roughly 74amps? Either way, I will stick to using my generator to heat the water in the tank.

It would likely be worse than that. The battery voltage would continue to sag, so 146a at 12v would become 160a at 11v, and 176a at 10v. This would be compounded by higher wire losses etc with the higher currents, and the diminishing effective capacity of the bank.
The 220amphour capacity is likely a 20 or 24 hour rating. At a discharge rate approaching the 1 hour rate, the effective capacity is greatly reduced, so the bank may behave more like a 120ah capacity. My guess is by the .5hr point, the voltage would have sagged to the point the inverter would drop the load to protect itself.
You can get away with big loads for short times (eg microwave), but for longer periods you get into a sort of selfreinforcing death spiral.Offgrid.
Main daytime system ~4kw panels into 2xMNClassic150 370ah 48v bank 2xOutback 3548 inverter 120v + 240v autotransformer
Night system ~1kw panels into 1xMNClassic150 700ah 12v bank morningstar 300w inverter 
moonbow said:Is it assumed that the above #'s are based on an hours use? Meaning for .5 hours my draw would be roughly 74amps?
Home system 4000 watt (Evergreen) array standing, with 2 Midnite Classic Lites, Midnite Epanel, Magnum MS4024, Prosine 1800(now backup) and Exeltech 1100(former backup...lol), 660 ah 24v Forklift battery(now 10 years old). Off grid for 20 years (if I include 8 months on a bicycle).
 Assorted other systems, pieces and to many panels in the closet to not do more projects. 
For flooded cell lead acid batteries, typically we recommend a maximum AC inverter capacity/power draw of ~500 Watts per 100 AH @ 12 volt battery bank. 220 AH @ 12 volts would be ~1,100 Watt recommended AC inverter maximum size (for various reasons on that size/type battery bank).
Also, remember that Power=Voltage*Current... You are pulling 14 amps @ 120 Volts for your electric water heater. At 12 volts, you are drawing from the battery bank: Power = V*I = 120 volts * 14 amps = 1,680 Watts
 I=P/V= 1,680 Watts / 12 volt battery bank = 140 Amps nominal from the battery bank
And for worst case electrical design:
 1,680 Watts * 1/0.85 ac inverter efficiency * 1/10.5 volts AC inverter "cutoff voltage" = 188 Amps worst case
That is a lot of current to pull from a 220 AH capacity (20 hour rate) lead acid storage battery.
Realistically, an 8 hour discharge rate is about what I would suggest drawing from a standard deep cycle lead acid battery... In terms of AC Watts, that would be:
 220 AH * 12 volt nominal * 1/8 hour discharge rate * 0.85 AC inverter efficiency = 280.5 Watt recommended continuous AC load
NowYou do have an AGM battery bank. AGM batteries are known for supporting very high current draw... 1 hour discharge or one brand even a 15 minute discharge (4x rated battery capacity).
HOWEVERDrawing high current from AGM batteries can damage the batteries (UPS batteries are typical AGM or GEL batteriesAnd are replaced every 12 years or after a "significant" discharge/power outage or two).
Also, if you are going to draw such high currents from your lead acid (or AGM) batteries at such low voltages (12 volt battery bus), you need very heavy and short cables from the AC inverter to the battery bank. For example, 0.5 volt drop 3,000 Watt 12 volt AC inverter:
 3,000 Watts * 1/0.85 AC inverter eff * 1/10.5 volt AC inverter shutdown voltage * 1.25 NEC wiring+breaker deratings = 420 amp rated wiring and branch circuit.
https://lugsdirect.com/WireCurrentAmpacitiesNECTable30116.htm
You would need a pair of 4/0 cables in parallel for such high current draw (can do with smaller cablesThis is a reasonably conservative recommendeation for DC bus cables in free air).
Then you want to have a maximum of 0.5 volt drop for your 12 volt wiring... Using a simple voltage drop accumulator and 2x 4/0 cable carrying ~4200 Amps, the maximum distance for the wiring would be:
5 feet (one way wire runSome calculators would use 10 feet as round trip wire run)
Voltage drop: 0.52
Voltage drop percentage: 4.35%
Voltage at the end: 11.48
The short answer is I would not recommend a 1,680 Watt load on a 220 AH @ 12 volt battery bank.. It will support such a load for a relatively short time. However, in the long term it is very hard on the batteries and takes something like 1/2 of their capacity: 220 AH * 11.5 volts = 2,530 Watt*Hours of stored capacity (very roughly)
 1,680 Watts * 1/0.85 AC inverter losses * 40 minutes runtime * 1/60 minutes per hour = 1,318 Watt*Hours used
 1,318 WH / 2,530 WH capacity = 0.52 ~ 52% of battery capacity
I suggest that you don't take the battery below ~50% state of charge (for longer battery life). Also, when you discharge a battery with a very heavy discharge current (your discharge rate is getting close to 1 hour discharge rate)... Batteries are typically rated a 20 Hour Discharge Rate (for our needs). When you discharge at a 1 hour discharge rate, the apparent AH capacity of the battery will be less (say ~180190 AH capacity or something...
Bill
Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset 
Excellent information regarding the discharge, load versus capacity, I totally agree the battery would be overtaxed. Another consideration is what is withdrawn needed to be replenished, plus a little extra to account for battery, controller,wiring plus other losses. If the PV is unable to replace the amount withdrawn, the battery will likely suffer undercharging, which in addition to the high discharge rates would likely result in premature battery failure.1500W, 6× Schutten 250W Poly panels , Schneider MPPT 60 150 CC, Schneider SW 2524 inverter, 400Ah LFP 24V nominal battery with Battery Bodyguard BMS
Second system 1890W 3 × 300W No name brand poly, 3×330 Sunsolar Poly panels, Morningstar TS 60 PWM controller, no name 2000W inverter 400Ah LFP 24V nominal battery with Daly BMS, used for water pumping and day time air conditioning.
5Kw Yanmar clone single cylinder air cooled diesel generator for rare emergency charging and welding.
Categories
 All Categories
 219 Forum & Website
 127 Solar Forum News and Announcements
 1.3K Solar News, Reviews, & Product Announcements
 188 Solar Information links & sources, event announcements
 885 Solar Product Reviews & Opinions
 254 Solar Skeptics, Hype, & Scams Corner
 22.3K Solar Electric Power, Wind Power & Balance of System
 3.5K General Solar Power Topics
 6.7K Solar Beginners Corner
 1K PV Installers Forum  NEC, Wiring, Installation
 2K Advanced Solar Electric Technical Forum
 5.5K Off Grid Solar & Battery Systems
 423 Caravan, Recreational Vehicle, and Marine Power Systems
 1.1K Grid Tie and Grid Interactive Systems
 648 Solar Water Pumping
 815 Wind Power Generation
 621 Energy Use & Conservation
 605 Discussion Forums/Café
 299 In the WeedsMember's Choice
 74 Construction
 124 New Battery Technologies
 108 Old Battery Tech Discussions
 3.8K Solar News  Automatic Feed
 3.8K Solar Energy News RSS Feed