Hi,

I'm looking to implement a battery powered solution to power my pool pump. I'm doing this for the primary purpose of recouping as much as I can whilst I still have the 55c feed in tariff here in qld.

Current setup.

5.5 KW system comprising of 300W panels connected to a SMA 6000 Inverter.

Average energy usage per day - 17KW (inc hot elec water, Pool Pump, Peak)

Average energy feed into grid per day approx. 15KW (after subtraction of used energy throughout the day)

I have 5 banks of 4x 12V 100amp/h batteries, the rectifiers and charging inverter already. Just don't have the output inverter.

I have a home office and work from home which means my daily "Peak" load is approx. 8KW

I'm planning to run an off the grid system such that my pool pump, currently using approx. 3KW per day, is powered by 2 banks of 48V batteries with 200amp\h capacity(comprising of 4 x 12V 100amp/h in series coupled with another string of the same)

The batteries will then be charged at night using the off peak controlled load with an estimated consumption of < 1KW.

The pool pump is a 1 hp, or 780W motor which is one of the new Zodiac E3 units recently replacing an older less efficient unit. The saving already since replacing the old pump are 35%.

If successful, I am looking to then power my hot water system (currently consuming 6 KW per day)exactly the same way and will utilise an additional bank of batteries as previously described. Meaning I will have 4 banks of 48V 100amp\h batteries.

pool pump

Looking at the math, P = VxI

750W = 240 x I

I = 750/240

I = 3 Amps

Pool pump is run for 5 hours every day but not at peak power. At approx. 80%

which equates to approx. 3 KW per day

Hot water system

3600 = 240 x ?

I = 3600/240

I = 15 amps

Therefore, in my first phase of testing where it is just the pool pump, I should be able to run my pool pump for at least 10-15 days before needing to charge the batteries again to ensure maximum life of the batteries is maintained. Wont know until load testing is done.

Looking at the hot water system, I should be able to run that for 5 days on batteries before needing a recharge.

Looking at the math, 90 days savings of 6kw per day = $$$$ in the bank for me.

I'm looking for any advice and guidance and comments from people who have done the same sort of setup and would really appreciate if anyone could share their real life experiences where this kind of setup did or didn't work for them.